Industrial Catalysis 2008 Vol.16

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Advances in studies on mechanisms for n-alkane hydroisomerization
JIN Changlei1,2;MA Bo11;ZHANG Xiwen2;LING Fengxiang2;ZHANG Zhizhi2
  
Abstract （1211）      PDF（pc） （333KB）（1854）       Save
Latest advances in studies on mechanisms for hydroisomerizaton of n-alkane over bifunctional catalysts supported on zeolites, including monomolecular and bimolecular reaction mechanisms, pore mouth mechanism and key-lock mechanisms, were reviewed. The prospects for application of these mechanisms in development of new catalysts were outlined.
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Latest researches in catalysts for preparation of aniline by liquid phase catalytic hydrogenation of nitrobenzene
ZHANG Cholin
  
Abstract （1225）      PDF（pc） （383KB）（2503）       Save
Latest researches in catalysts for preparation of aniline by liquid phase catalytic hydrogenation of nitrobenzene were reviewed, including those ICI, MTC and Du Pont．More detailed description was given on nickel and noble metal catalysts. Currently employed catalysts for the liquid-phase hydrogenation are mostly highly-active noble catalysts with complicated preparation process and higher cost. Development of low-cost, high-efficiency catalysts, which meet the requirement of green chemistry, will be the trends in this aspect.
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Advances in hydrotreating technologies for clean diesel oil
ZHAO Ye;ZHANG Wencheng;GUO Jintao;LIU Wenyong;FENG Xiufang
  
Abstract （1093）      PDF（pc） （435KB）（1572）       Save
Requirement on hydrotreating technologies for production of clean diesel oil in China and latest worldwide advances in the hydrotreating technologies were reviewed. Suggestions were put forward concerning clean diesel oil production in China.
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Advances in synthesis of 1,1,1,3-tetrafluoropropene
WANG Bo;LV Jian
  
Abstract （1168）      PDF（pc） （379KB）（1953）       Save
Advances in synthesis of 1,1,1,3-tetrafluoropropene(HFO-1234ze) were reviewed, including advantages and disadvantages of each synthetic route. Synthesis of HFO-1234ze by gaseous phase catalytic fluorination of 1,1,1,3,3-pentachloropropane（HCC-240fa）would be the trends in this field.
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Recent researches in the catalysts for conversion of methanol to hydrocarbons and the reaction mechanism
HUANG Xiaochang;FANG Yiwen;QIAO Xiaohui
  
Abstract （1151）      PDF（pc） （359KB）（2319）       Save
Application of modified or non-modified ZSM-5, β and SAPO-34 zeolite catalysts in conversion of methanol to hydrocarbons was reviewed. ZSM-5 is mainly used in methanol-to-gasoline and methanol-to-aromatics process; methanol can be converted over β zeolite to ethylene, propylene, propane, iso-butane, hexamethylbenzene and small amount of pentamethylbenzene; SAPO-34 is highly-selective to lower olefins. The reaction mechanisms for methanol-to-hydrocarbons reactions were reviewed, especially formation of initial carbon-carbon bond and hydrocarbon species.
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Function of fluidized bed reactor in reforming of methane withCO2 to syngas in the presence of oxygen
JING Qiangshan1;LIU Peng1;LOU Hui2;Zheng Xiaoming2
  
Abstract （1129）      PDF（pc） （360KB）（1413）       Save
Methane reforming with CO2 in the presence of oxygen was studied in a fluidized bed reactor. Fluidization behaviors of the catalyst particles in the reactor were investigated by calculating minimum fluidization velocity and terminal fluidization velocity. Comparative study between fluidized bed and fixed bed reactors showed that fluidized bed reactor was superior to fixed bed reactor especially in activity and stability of the catalyst, autothermal process and coke formation, with CH4 conversion approaching hermodynamict equilibrium, bed temperature gradient less than 10 ℃ and no coke formation after reaction for 20 h.
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Commercial application of LCC-2 FCC catalyst for more propylene
QIN Song1;ZOU Xubiao1;ZHANG Zhongdong2
  
Abstract （1246）      PDF（pc） （254KB）（1534）       Save
LCC-2 FCC catalyst for more propylene was developed by PetroChina Lanzhou Petrochemical Company. Commercial application results showed that the catalyst remarkably increased production of propylene and enhanced octane number of gasoline, with satisfactory product distribution.
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Synthesis of ethylene via vapor phase dehydration of ethanol
LV Limin; WANG Jia;HE Bangfang;SUN Lulu;LIU Chunshan
  
Abstract （1205）      PDF（pc） （323KB）（1933）       Save
The catalytic behaviors of supported phosphotungstic acid catalyst were studied in a fixed-bed reactor. The optimal reaction condition was as follows: 8% phosphotungstic acid supported on γ-Al2O3, 240 ℃, LHSV 0.60 h－1. Ethanol conversion of 99.28% and ethylene yield of 99.36% were obtained under the optimal condition. The catalyst is superior to conventional liquid inorganic catalysts, with higher activity, environmental-friendliness, lower energy consumption and good stability.
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Application of molecular sieve solid base catalysts in organic synthesis
BAI Susong;WU Yanhui
  
Abstract （1095）      PDF（pc） （356KB）（2407）       Save
The researches in molecular sieve solid base catalysts, including modified microporous (NaX, NaY, L) and mesoporous molecular sieves (MCM-41,SBA-15) base, were reviewed, as well as their application in various organic reactions, such as double bond isomerization, esterification, transesterification, Knoevenagel condensation, Aldol condensation and Michael addition.
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Synthesis of cyclohexanone glycol ketal catalyzed by ammonium ferric sulfate under microwave irradiation
ZHANG Aihua1,2;LI Zhiping1;YIN Dulin2
  
Abstract （1211）      PDF（pc） （327KB）（1523）       Save
Cyclohexanone glycol ketal was directly synthesized from cyclohexanone and glycol under microwave irradiation using ammonium ferric sulfate as the catalyst. The effects of reactant mole ratio, catalyst dosage,microwave irradiation power and microwave irradiation time on the yield of cyclohexanone glycol ketal were investigated. The results showed that the optimal condition was as follows: n (cyclohexanone)∶n(glyco1)=1∶1.4, catalyst dosage=3.5% of the mass of the reactants, microwave irradiation power=450 W, radiation time=7 min. Cyclohexanone glycol ketal yield of up to 88.1% was obtained.
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Synthesis of 3,5-dimethylaniline via gas-phase amination over Pd-La/γ-Al2O3 catalyst
HE Bangfang;SUN Lulu;LV Limin;WANG Jia;LIU Chunshan
  
Abstract （1207）      PDF（pc） （460KB）（1380）       Save
A Pd-La/γ-Al2O3 catalyst was prepared by impregnation method using γ-Al2O3 as the support. Synthesis of 3,5-dimethylaniline via gas-phase amination was investigated in a continuous fixed bed reactor over the catalyst. The fresh and deactivated catalyst samples were characterized by BET, XRD, TG-DTG and SEM. The results showed that coke formation occurred on both the metal and the support.
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Synthesis of benzyl bromide using potassium bromide and concentrated sulfuric acid method
SONG Zhiguo1；WANG Min2；JIANG Heng3；GONG Hong3
  
Abstract （1403）      PDF（pc） （320KB）（2052）       Save
Benzyl bromide was synthesized from potassium bromide, a by-product from synthesis of 2-hydroxy-4-n-octyloxybenzophenone (UV-531), and benzoic alcohol in the presence of concentrated sulfuric acid. The optimal condition was obtained as follows: n(potassium bromide)=0.1 mol, n(benzoic alcohol)=0.08 mol, V(concentrated sulfuric acid)=5 mL, V(H2O)=2.5 mL, reflux for 4 h. Yield of up to 94%.was obtained. Raw product was analyzed by GC and almost no by-product was detected. The pure product was characterized by IR and index of refraction.
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Behavior of trace HF reaction promoter in alkylation catalyzed by HPWA/SBA-15
SHEN Jian11；LIU Chuanbin2；WEN Qinwu2；ZHAO Xin1
  
Abstract （1163）      PDF（pc） （297KB）（1455）       Save
Behaviors of trace amount of HF reaction promoter in alkylation of benzene with 1-hexadecene, catalyzed by phosphotungstic acid supported on SBA-15, were studied. The results showed that trace amount of HF reaction promoter had remarkable accelerating effect, with increased conversion of 1-hexadecene. The optimal reaction condition was as follows: mass fraction of HF 0.2%, reaction time 3 h, reaction temperature 170 ℃. 1-Hexadecene conversion of 99.20% and selectivity to hexadecylbenzene of 99.03% were attained under the optimal condition.
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Solventless synthesis of 7-hydroxy-4-methyl coumarin catalysed by H2SO4-SiO2
QIN Shengjun；XIN Xiulan；XU Baocai
  
Abstract （1135）      PDF（pc） （379KB）（1585）       Save
Four types of H2SO4-SiO2 catalyst were prepared. 7-Hydroxy-4-methyl coumarin was synthesized from ethylacetoacetate and resorscinol over H2SO4-SiO2 catalyst without presence of solvent. Orthogonal experiments were carried out using catalyst types, catalyst dosage, reaction time, reaction temperature and mole ratio of reactants as the elements. The optimum condition was obtained as follows: n(H2SO4)∶n(Si)=0.75∶1，ethylacetoacetate-to-resorscinol mole ratio=1∶1, catalyst dosage=0.35 g［while n(resorscinol)=0.04 mol］, reaction temperature 105 ℃, reaction time 95 min. 7-Hydroxy-4-methyl coumarin yield of 72.4% was obtained under the optimal condition.
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Oxidation of p-xylene with molecular oxygen catalyzed by CoCl2 supported on 5A zeolite
LIAO Yongzhi1;YANG Kunguo2
  
Abstract （1279）      PDF（pc） （359KB）（1421）       Save
5A zeolite was mixed with CoCl2 solution, heated to vaporize water, dried at 150 ℃ for (8-10) h, washed and dried again. Photometric analysis of the eluted CoCl2 solution indicated that, for 5A zeolite, there were a saturating capacity for loading of CoCl2. p-Xylene conversion of 56.44%, p-toluic acid yield of 44.82%, p-tolualdehyde yield of 5.80% and p-toluic alcohol yield of 2.75% were obtained under the following condition: n(p-xylene)=15.0 mmol,m(catalyst)=80 mg, n(p-toluic acid)=0.50 mmol, reaction at 95 ℃ for 10 h. The catalyst was repeated used for five times.
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Modification of Fe on Co/diatomite catalyst for selective hydrogenation of cinnamaldehyde
LI Wanwei1;LIU Zili2
  
Abstract （1158）      PDF（pc） （501KB）（1843）       Save
The modification function of iron on Co/diatomite catalyst for selective hydrongenation of cinnamaldehyde(UAL) to cinnamyl alcohol(UOL) was studied. Experimental investigation results showed that addition of small amount of Fe had influence on Co/diatomite, with remarkable influence on conversion of UAL and less influence on selectivity to UOL. When n(Fe)/n(Co)≤0.20（mol/mol），UAL conversion was increased from 60.69% to 80.63%, but UAL conversion declined with further increase in n(Fe)/n(Co). XRD, SEM and positron annihilation results indicated that Fe affects perfectness of Co3O4 crystals and leads to increasing crystal defects; Fe also improved dispersion of the catalyst on diatomite surface, with more obvious single layer dispersion and smaller crystal grain size of the catalyst on diatomite.
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Preparation and characterization of molybdate-promoted SO42-/Al2O3-ZrO2 solid acid catalysts
MA Jieping;WANG Shuili;WANG Yan;GONG Chuandong
  
Abstract （1145）      PDF（pc） （374KB）（1488）       Save
MoO3-modified SO42-/Al2O3-ZrO2 were prepared by co-precipitation and impregnation method, using zirconium nitrate and aluminum nitride as the zirconium and aluminum source. The catalysts were characterized by element analysis, FT-IR and XRD. The activity of SO42-/Al2O3-ZrO2 was investigated for esterification of acetic acid and n-butanol. XRD results indicated that there were MoO3 diffraction peaks when content of MoO3 exceeded 12.0%(mass fraction), which meant that appropriate amount of MoO3 results in single layer dispersion on the surface and hence stabilized sulfate. FT-IRresulted showed that there were typical characteristic adsorption peaks for solid superacid in the catalysts. Appropriate amount of sulfur were enhanced the catalytic activity. Optimum catalytic activity was attained when adding 8.0%(mass fraction) MoO3 and calcined at 650 ℃.
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Synthesis and characterization of ultra-dispersed MnS nanoparticles
HE Jie;AN Changhua;WANG Zongxian
  
Abstract （1114）      PDF（pc） （332KB）（1488）       Save
Surface-modified γ-MnS nanoparticlcs were synthesized by the method named as ‘Colloid Chemistry Assistant Solvothermal Technique’. γ-MnS nanoparticlcs were characterized by A facile synthesis method to fabricate ultra-dispersed transition metal sulfide nanoparticles was developed . This method was named as ‘Colloid Chemistry Assistant Solvothermal Technique’. Surface-modified γ-MnS nanoparticlcs were synthesized by this technique. The MnS nanoparticles were protected by organic (xianan) that showed complexation structure in the combination with the metal nanoparticles. Having characterized as-formed products' molecular compositions and structures and indicated its complexation structure. The product had good thermal-stability and chemical-stability with good dispersion in considerable small particle size and narrow distribution. The blue shift of the indicated The quantum size effect of metastable MnS nanocrystals was observed with a blue shift of UV-Vis absorption edge. The experimental results provided in this article are meaningful for developing new photoelectrochemistry nanocatalysts.
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Effects of electric field or magnetic field on catalyst preparation
YE Yanhui，LI Baoshan
  
Abstract （1211）      PDF（pc） （331KB）（1638）       Save
Latest researches on the effects of electric field or magnetic field on the structure and the behaviors of catalytic material prepared were reviewed in this paper, including the effects of electric field or magnetic field on the formation of crystal grains and their growth. The relationship among electric or magnetic field, grain refinement and the catalytic activity was discussed.
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Studies and application of transesterification catalysts
SHEN Guoliang，LI Senlin，LI Yinping
  
Abstract （1210）      PDF（pc） （323KB）（2075）       Save
Studies and application of catalysts for transesterification reaction, especially homogeneous catalysts  like alkali or alkali metal compounds, Lewis acids, organic metal compounds and heterogeneous catalysts like metallic oxides supported on SiO2, Al2O3 and zeolites, were reviewed. Development of supported tin and titanium compounds catalysts would be the trends in the aspect of transesterification catalysts.
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Preparation and application of functionalized periodic mesoporous organosilicas catalysts
XIA Housheng， TONG Dongshen， ZHOU Chunhui， JIANG Genfeng， ZHANG Di
  
Abstract （1142）      PDF（pc） （561KB）（1334）       Save
Advances in the development of periodic mesoporous organosilicas(PMOs) catalytic material were reviewed, including main methods for preparation and functionalization of PMOs as solid acid/base, chiral, metaldoped catalysts and their catalytic properties. The correlation between the catalytic behaviors and the unique functionalized structure of PMOs catalysts was discussed.
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Preparation of graphitic carbon nitrides and their application in organic chemical catalysis

JIANG Genfeng, ZHOU Chunhui, HE Xuehua, TONG Dongshen, XIA Housheng

  
Abstract （1219）      PDF（pc） （387KB）（1699）       Save
The recent advance in graphitic carbon nitrides as a new catalytic material and their application using for organic chemical catalysis were introduced. The main preparation methods of carbon nitrides from direct thermal and solvothermal processes and the influence of preparation conditions on the structure of asprepared graphitic carbon nitrides were summarized. The key point of preparation and application prospects of graphitic carbon nitrides were outlined.
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Preparation of CuO-CeO2 by modified citrate method and its catalytic activity for low temperature CO oxidation
MAO Dongsen, TAO Lihua, GUO Yanglong, LU Guanzhong
  
Abstract （1203）      PDF（pc） （335KB）（1516）       Save
CuO-CeO2 catalyst was prepared by modified citrate method using ethanol instead of water as the solvent. The catalyst was characterized by N2 adsorption, XRD and H2TPR and its catalytic activity for low temperature CO oxidation was investigated in a microreactorGC system. The results indicated that there existed only larger CuO particles less associated with ceria in the catalyst prepared by conventional method, while there existed highly dispersed CuO with strong interaction with ceria in the catalyst prepared by the modified method; the latter thus had higher catalytic activity for low temperature CO oxidation
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Effect of promoter on the activity of CuO/Al2O3/CC catalysts
DONG Guojun*, HAO Shufu, GONG Fan
  
Abstract （1169）      PDF（pc） （366KB）（1348）       Save

Cu catalysts with modified cordierite as inert carrier were prepared by impregnation method. The results of activity study showed that lowtemperature activity of Cu-Mn-Ni-Ce-O/Al2O3/CC catalyst was higher, the conversion rate reached 50.46% at 150 ℃ and 100% at 300 ℃, respectively. The catalyst was characterized by BET, XPS and TPR. The results showed that specific surface area and average pore diameter of Cu catalyst increased after adding Mn, Ni and Ce, and the catalyst was reduced more easily. The elements on the catalyst surface existed in the oxide forms of Cu(Ⅱ)，Mn(Ⅳ)，Mn(Ⅲ)，Ni(Ⅱ) and Ce(Ⅳ).

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Preparation and characterization of activated carbon particles capsulated with ethyl cellulose
YAN Chunxiao, ZHU Haiyan, ZHOU Chaohua, CHEN Yix
  
Abstract （1196）      PDF（pc） （586KB）（1631）       Save
Activated carbon as the sorbent and catalyst support was capsulated with ethyl cellulose by phase separation methods. The activated carbon microencapsulated was characterized by SEM, TGDSC and adsorption techniques. The results showed that the adsorption capability to low concentration benzene vapor on activated carbon had no influence after capsulation, and the specific surface area and total pore volume decreased a little.
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Comparative study on Al2O3 or SiO2 supported vanadium oxides by UVRaman spectrometry
LIU Jian, ZHAO Zhen*, XU Chunming, DUAN Aijun, JIANG Guiyuan
  
Abstract （1195）      PDF（pc） （327KB）（1471）       Save
Al2O3 or SiO2supported vanadium oxide catalysts were prepared by citric acidassisted incipientwetness impregnation method, and their structures were characterized by UVRaman spectrometry. The results indicated that the structure of supported vanadium catalysts was dependent on the vanadium loadings and types of the supports. At lower vanadium loadings, there existed isolated monovanadate species on the catalyst surface. At higher vanadium loading, VOx species existed as polyvanadate species and V2O5 on Al2O3, but vanadium existed predominantly as isolated monovanadate species and V2O5 with a little amount of polyvanadate species on SiO2.
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Preparation and catalytic performance of Pd/activated carbon catalyst for 〖WTHX〗o〖WTHZ〗xylene complete oxidation
HUANG Shaoyong, ZHANG Changbin, HE Hong
  
Abstract （1199）      PDF（pc） （461KB）（1412）       Save
Activated carbon (AC) supported noble metal (Pd, Pt, Au, Ag and Rh) catalysts were prepared and their catalytic activities for complete oxidation of 〖WTBX〗o〖WTBZ〗xylene were tested.The results showed that Pd/AC catalyst had the highest activity among these catalysts. The effects of preparation solvent, catalyst pretreatment, metal loading and gas hourly space velocity(GHSV) on the activity of Pd/AC for 〖WTBX〗o〖WTBZ〗xylene oxidation were investigated. By means of the BrunauerEmmettTeller(BET), thermogravimetrydifferential thermal analysis(TGDTA), Xray photoelectron spectroscopy(XPS) and Xray diffraction(XRD) characterizations, the relation between the physicochemical properties and the catalytic activity of the Pd/AC catalyst for 〖WTBX〗o〖WTBZ〗xylene oxidation was established. The reduced Pd was the main existence state of Pd on Pd/AC and also the active species for 〖WTBX〗o〖WTBZ〗xylene oxidation. Based on the intermediates detected by the gas chromatographymass spectrometry(GC/MS), a propositional mechanism of the catalytic oxidation for 〖WTBX〗o〖WTBZ〗xylene over the Pd/AC catalyst was given.
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Preparation and magnetic properties of Ni1-xCoxFe2O4 ferrite from Ni(Ⅱ)Co(Ⅱ)Fe(Ⅱ)Fe(Ⅲ)LDHs precursors
FENG Junting, LIN Yanjun, LI Dianqing
  
Abstract （1106）      PDF（pc） （444KB）（1296）       Save
Layered double hydroxides(LDHs) precursors Ni2+-Co2+-Fe2+-Fe3+-SO42--LDHs were synthesized by a method consisting of separate nucleation and aging steps (SNAS). Ni1-xCoxFe2O4 spinel ferrites were obtained after calcination at 900 ℃. XRD and ICP results indicated that Ni1-xCoxFe2O4 spinel ferrites had fine crystal structure and controllable composition. In addition, preferable linear fitting were found between the magnetic data of Ni1-xCoxFe2O4 and the value of x［x=n(Co)∶n(Ni)］ . The practical magnetic values of Ni1-xCoxFe2O4 were higher than theoretically mixed and mechanically mixed values of NiFe2O4 and CoFe2O4, which indicated that there was a synergistic effect on Co and Ni which resulted in better magnetic properties of 〖JP2〗Ni1-xCoxFe2O4. When x equaled to 0.2, Ni1-xCoxFe2O4 exhibited the best magnetic 〖JP〗properties.
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Synthesis of heteroatom zeolite NiZSM5 and the influential factors

LI Xiao, LI Baoshan

  
Abstract （1120）      PDF（pc） （336KB）（1473）       Save
Heteroatom zeolite NiZSM-5 was synthesized by hydrothermal method. Influential factors for the crystallization product, i.e., ratio of the reactants, pH value, crystallization time and crystallization temperature, were investigated. XRD results showed that NiZSM-5 zeolite with regular structure was obtained under favorable condition as follows: n（SiO2）∶n(TBAB)∶n(H2O)=1.0∶0.2∶67, pH of the emulsion=9, crystallization time 96 h, crystallization temperature 160 ℃.
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Effect of carbon sources on preparation of Mo2C/SAPO11 catalyst and its behaviors for isomerization of nheptane
CHANG Yong;ZHU Jing;WANG Haiyan;GU Feng;MENG Yu;WEI Min
  
Abstract （1239）      PDF（pc） （346KB）（1343）       Save
SAPO-11 supported molybdenum carbide catalyst was prepared by TPR using different carbon sources. The influence of carbon sources on preparation of Mo2C/SAPO-11 catalyst and its catalytic behaviors for hydroisomerization of nheptane were investigated in a fixedbed downflow reactor．The results showed that selectivity to isomers of 68.67%, isomers yield of 55.89% and nheptane conversion of 81.39% were obtained under following condition: 400 ℃, 1.5 MPa, LHSV 1.0 h-1, hydrogen/hydrocarbons volumetric ratio 200∶1. No considerable decline of the catalytic activity was observed after continuous reaction for 120 h.
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Research on metal components distribution status on support of hydrogenation catalyst
TIAN Ran;WANG Fucun;SUN Famin;ZHU Jinling;LU Qian
  
Abstract （1183）      PDF（pc） （308KB）（1360）       Save
A novel Ni/W supported hydrogenation catalyst(HDCAT) was prepared by means of impregnation method on the support of Al2O3. HDCAT was characterized by XRD, DRUVS and TGDSC techniques, and the distribution status of active metals on the support of Al2O3 was analyzed.
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Heck reaction catalyzed by polystyrene supported dicyclohexylamine palladium
YUAN Dingzhong;ZHANG Qiuyu
  
Abstract （1219）      PDF（pc） （644KB）（1491）       Save
Polystyrene supported dicyclohexylamine palladium was synthesized and characterized by means of XPS, TG, DTA, XRD and SEM, and used in the Heck reaction of acrylic acid and styrene with iodoarenes. The results showed that coordination occurred between palladium and polymers and the catalyst was stable at room temperature to 200 ℃. The polystyrene supported palladium exhibited high activity for Heck arylation of acrylic acid and styrene with iodoarenes, forming substituted transcinnamic acid or trans stilbene.
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Preparation of highly dispersed Ni nanoparticles from a hybrid composite precursor
BAI Lu;XIANG Xu;LI Feng
  
Abstract （1218）      PDF（pc） （513KB）（1346）       Save
Highly dispersed Ni nanoparticles were prepared by a method of in situ reduction from the layered double hydroxide/carbon composite precursor. The materials were characterized by XRD, TEM，BET and TG-DSC. The results indicated that metallic Ni nanoparticles in situ with a size of around 10 nm via the temperaturecontrolled calcination in an inert atmosphere were obtained. It was concluded that the carbon existing in the composite played a role of reducing agent and thus reduced oxidized nickel species into metallic Ni nanoparticles during heating. The results indicated that the reaction temperature had an important impact on the composition of the product. In addition, the nickel nanoparticles exhibited excellent catalytic behavior for thermal decomposition of ammonium perchlorate.
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Effect of different factors on adsorption of sulfurcontaining compounds over CeY zeolites
JIN Lingling;LI Xiuqi;WANG Hongguo;JU Xiufang;LIU Liming;SONG Lijuan
  
Abstract （1255）      PDF（pc） （385KB）（1301）       Save
CeY zeolites were prepared from NaY zeolites using liquidphase ionexchange method for selective removal of organic sulfur compounds from model fuels. XRD and ICP were used respectively to investigate the structure and the Celoadings of the sorbents. Effects of the loadings of cerium ions, calcination temperature, Ce valency, and moisture adsorbed by the zeolites on the adsorption of organic sulfur compounds over the CeY samples were studied via static adsorption experiments. The results showed that sodium ions exchange extent of 88.9% was attained after two times of ion exchange; optimal calcination temperature was around 500 ℃; excessive high calcination temperature resulted in collapse of the zoelite structure; Ce(Ⅳ)Y exhibited much higher adsorptive capacity than Ce(Ⅲ)Y; moisture in the zeolite had remarkable influence on organic sulfur compounds adsorbing properties on CeY zeolites.
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Influence of silica source on the structure and catalytic activity of Bi-MSU-4 zeolites
ZHAN Huaduan;ZHENG Jing;WANG Yu;WEI Kemei;CHEN Xiaohui
  
Abstract （1230）      PDF（pc） （746KB）（1346）       Save
Mesoporous silica Bi-MSU-4 molecular sieves were synthesized with nonionic ethoxylated sorbitan esters (Tween-40) as the structure directors, Bi(NO3)3·5H2O as the bismuth source, and TEOS, Na2SiO3·9H2O,Gel H and silica sol as silica sources, respectively. The structure and physical properties of the samples were investigated by XRD, UVvis and SEM. The catalytic activity of Bi-MSU-4 for oxidation of styrene to benzaldehyde using H2O2 as the oxidant in methanol medium was investigated. The sults showed that silicon resources had remarkable influence on the structure and catalytic properties of Bi-MSU-4. TEOS and Na2SiO3·9H2O, hydrolyzed at lower speed, resulted in more regular framework and higher catalytic properties. Silica sol, with hydrolysis and polycondensation speed too fast to completely react with Tween-40, resulted in poor regularity of the structure and lower crystallinity and styrene conversion. Gel H did not hydrolyze completely under acidic condition and resulted in lower crystallinity and catalytic activity.
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Synthesis of EU-1/MOR composite zeolite using preset crystal seeds
ZHOU Pengyan;LI Xiaofeng;WANG Yuxin; WU Xingjie;DOU Tao
  
Abstract （1279）      PDF（pc） （472KB）（1367）       Save
EU-1/MOR microporous composite zeolite was synthesized using organic template(HMBr2), preset crystal seeds and adding MOR into high concentration system. EU-1/MOR composite zeolite with good crystallinity was prepared under following condition: MOR mass fraction≥20%, 30≤n(SiO2)∶n(Al2O3)≤60，crystallization time (36-96) h，crystallization temperature (420-450) K. The EU-1/MOR zeolite was characterized by XRD, IR and SEM. The characterization results indicated that the zeolite had high purity, good crystallinity and high catalytic activity.
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Preparation of TiO2 by fibrous template and its photodegradation of dyes
LIU Yang;Lu Jian;LIU Zhongwen;LIU Zhaotie
  
Abstract （1245）      PDF（pc） （437KB）（1312）       Save
Anatase TiO2 with special morphology was prepared by using ramie fiber as a template, Ti(OnBu)4 as titanium precursor, and absolute ethanol as a solvent. The influence of reaction time and Ti(OnBu)4 concentration on the yield of TiO2 was investigated in detail, and the optimum reaction conditions were obtained. The formation of anatasephase TiO2 under optimum reaction conditions was confirmed by XRD analysis. SEM images showed that the obtained TiO2 had rich wrinkles. The asprepared TiO2 had higher photocatalytic activity to the photodegradation of the C.I. reactive red X3B.
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Study on catalytic behavior of Ptsupported carbon materials for selective hydrogenation of cinnamaldehyde
GAO Xuexia, WANG Chunxia, LIU Zhongwen, L Jian, LIU Zhaotie
  
Abstract （1223）      PDF（pc） （467KB）（1367）       Save
The 3wt% Pt/carbon catalysts, i.e., multiwalled carbon nanotube(MWCNT), active carbon(AC), carbon nanofibers(CNF), and carbon aerogel(CA), were prepared by liquid reduction method, respectively. The crystal structure and morphologies of the catalysts were characterized by XRD and TEM. The hydrogenation activity of cinnamaldehyde(CALD) and the selectivity to the product were studied using the selective hydrogenation of CALD as the probe reaction. The results showed that a clear effect of the carbon support on the catalytic behaviors of the catalysts was observed. The selective hydrogenation of C=O bonds in CALD occurred over CNFand MWCNTbased catalysts while the selective hydrogenation of C=C bonds in CALD was dominant in the case of Ptsupported CA and AC catalysts. Pt/MWCNT showed the highest conversion of CALD among the catalysts investigated.
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Synthesis and characterization of novel L/ZSM5 composite zeolite
XU Chunli, GUO Shiling, CHEN Yiliang, ZHANG Zhongdong
  
Abstract （1201）      PDF（pc） （438KB）（1352）       Save
A novel composite zeolite of L/ZSM5 was synthesized by hydrothermal crystallization method under the reaction condition of favorable SiO2/Al2O3 molar ratio and pH value. The composite zeolite was characterized by XRD, SEM and IR. The influence of acid amount on synthesis of composite zeolite was discussed. The optimum amount of the acid added to the synthesis system was (0.802 0~0.939 9) g. The stronger acidity in a certain range was in favor of synthesis of ZSM5. The stronger the acid, the higher the percent of ZSM5 in the composite zeolite.
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Structure and catalytic properties of MoO42-intercalated
Mg-Al-Ti layered double hydroxides
LEI Zhiyi, ZHU Liang, LI Feng
  
Abstract （1212）      PDF（pc） （377KB）（1501）       Save
MoO42-intercalated layered double hydroxides(MoO42-LDHs) containing Mg2+,Al3+and Ti4+were synthesized by the anion exchange method. The materials were characterized by means of Xray diffraction(XRD), Fourier transform infrared(FTIR) and thermogravimetric and differential analysis(TGDTA). The results indicated that calcination of intercalated LDHs samples could give rise to the formation of composite metal oxides containing Ti and Mo, and calcination temperature had a significant effect on the composite and structure of the calcined samples. The oxidation of propylene epoxidation by hydrogen peroxide exhibited that MoO42-LDHs calcined at 500 ℃ achieved the highest conversion of propylene owing to the presence of more amount of composite oxide phase containing active centers.
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