Industrial Catalysis 2006 Vol.14

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Recent advances in ester reactions catalyzed by suppor
ted heteropoly compounds
HAN Huajun1,2;CHEN Tong1;WANG Gongying1
  
Abstract （802）      PDF（pc） （327KB）（1260）       Save
The researches in and application of heteropoly acid, heteropoly salts
and heteropoly compounds supported on activated carbon, silica(SiO2), titania
(T
iO2), MCM-41, as the catalysts for ester reaction, were reviewed. Heteropoly
com
pounds, with the properties of quasi-liquid and super acid, has been widely ap
p
lied to ester reactions. Main problems with application of heteropoly compounds
as homogeneous catalyst are separation of the catalyst and reaction products. Su
pported heteropoly compounds debottleneck the separation problem with homogeneou
s catalyst, and meanwhile exhibit high activity and selectivity.
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Researches in the catalysts for synthesis of 2,6-dialk
ylnaphthalene
LOU Nianjun; CAO Fahai; FANG Dingye
  
Abstract （804）      PDF（pc） （293KB）（1205）       Save
The processes and catalysts for syn
thesis of 2, 6-dialkylnaphthalene via alkylation and acylation, respectively, w
e
re reviewed. Researches in and application of Lewis acid, Bronsted acid, alkali,
alkaline earth and molecular sieve catalysts were described in detail. Molecula
r sieve is a promising catalyst in this aspect.
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Synthesis of β/MCM-41 and its catalytic performance in
alkylation
CHhang Youguo; Zhang Yi;Wang Xueli;Lian Piyong
  
Abstract （759）      PDF（pc） （297KB）（1075）       Save
A β/MCM-41 composite molecular sieve with mesoporous and microporous

structure was prepared under hydrothermal conditions by two-step crystallizatio
n
process. As-synthesized samples were physicochemically characterized by X-ray
d
iffraction(XRD), N2 adsorption-desorption and infrared analysis(IR). The resu
lts
showed existence of well-structured microphase β zeolite and mesophase MCM-4
1 in
the composite materials. Catalytic properties of the composite for alkylation o
f benzene with long-chain olefin were studied.β/MCM-41 exhibited good catalyt
ic
activity and selectivity in alkylation of benzene with long-chain olefins and
m
ay be substitute for HF as an environmentally-benign catalyst in long-chain al
kylbenzene production.
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Mechanism for silver strip test and
the way to solution of unqualification of jet fuel in the test
PAN Ruijuan
  
Abstract （752）      PDF（pc） （237KB）（1441）       Save
The cause for silver strip corrosion and solution to disqualification
of jet fuel in silver strip test were described. The results showed that disqual
ification of jet fuel in silver strip test was caused by active sulfides, especi
ally elementary sulfur. Supplemental refining may be adopted to solve the proble
m, with no influence on related quality of the product .
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Synthesis of n-butyl propionate catalyzed by ferric sul
fate hydrate
GONG Churu1;WANG Chunzhao2;DONG Jinghua1;CHEN Caiyuan1
  
Abstract （800）      PDF（pc） （241KB）（1203）       Save
n-Butyl propionate was synthesis fromn-butyl alcohol
and propyl ac
id
catalyzed by ferric sulfate hydrate. The results indicated that ferric sulfate
featured higher activity, simplicity in operation, low cost and repeated use. Pr
opyl acid conversion of 99.0% andn-butyl propionate yield of 86
.8% were obtaine
d under the following optimal reaction condition:n(n-butyl alcohol)∶n(propyl
acid)=1.3∶1,catalyst dosage=1.5%, V（cyclohexane）∶n(propyl acid)=8 mL∶0.15 mol, reaction time=70 min.
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Synthesis of n-butyl acetate over acid-treated cross-linked montm
orillonite
JIA Lihua; LI Hua; WU Liyan; GUO Xiangfeng
  
Abstract （828）      PDF（pc） （253KB）（1262）       Save
Cross-linked montmorillonite and acid-treated cross-linked montmori
llo
nite was characterized by means of XRD, SEM and BET. Acid-treated cross-linke
d
montmorillonite was used as the catalyst for synthesis of n-butyl a
cetate from b
utanol and acetic acid,with toluene as the water-carrying agent.Optimum synth
e
sis condition was investigated by orthogonal experiment. The results showed that
15% acid-treated cross-linked montmorillonite, with surface area of 229 m2
·g－1 and d001=1.25 nm,exhibited best catalytic activity,with esterificat
ion rate
of about 98% under the following optimum reaction condition:n(a
lcohol)∶n(acid)=1∶1.3,w(catalyst)=2.5% of the feed,and reaction t
ime 2.5 h.
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Preparation of zinc oxide and its catalytic behaviors in synthesis of dimethyl
carbonate (DMC)
QI Zengzhong; WANG Hongbo; XIA Daikuan
  
Abstract （820）      PDF（pc） （493KB）（1452）       Save
Activity of four zinc oxide catalysts, prepared by calcination of zinc
acetate, microwave method, sol-gel method and co-precipitation method, respec
ti
vely, for synthesis of dimethyl carbonate (DMC) through alcoholysis of urea, was
investigated. The experimental and XRD and SEM results showed that [JP3]zinc ox
ide c
atalyst particles prepared by sol-gel had uniform size and good catalytic activ
i
ty, with DMC yield of 8.17%. Mechanism for the catalytic reaction over zinc
oxide catalyst was proposed.
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Development of a new catalyst for rosin disproportionati
on

Wang Zhen

  
Abstract （799）            Save

A non-noble metal nanoparticle catalyst for rosin disproportionation was develo
ped using nanote
chnology. Process condition for rosin disproportionation over the catalyst was i
nvestigated.The results indicated that N/L-T catalyst prepared by sol-gel-pre
cip
itation, followed by calcinations for 2.5 h at 500 ℃ and reduction for 3 h at
3
00 ℃, had higher activity. Optimum condition for rosin disproportionation was
obtained as follows: reaction temperature 270 ℃, reaction time 3 h and cat
alyst dosage 2.5%.

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Preparation and properties of SO42－/TiO2/Ce4+ ra
re earth solid superacid catalyst
TAN Zhiwei1, 2；YU Lin1； SHEN Mingcai2
  
Abstract （781）      PDF（pc） （313KB）（995）       Save
SO2－4/TiO2/Ce4+ rare earth solid superacid catal
yst was prepared by so
l-gel method and used for synthesis of benzaldehyde ethandiol acetal. Influenc
e
of H2SO4 concentration, Ce(SO4)2 concentration and caicination temperat
ure on t
he catalytic behaviors was investigated. Properties of the catalysts were also
studied by IR, XRD, DSC and Hammett indicator method. The results indicated that
rare earth superacid SO42－/TiO2/Ce4+， is an exc
ellent catalyst for synthesis of
benzaldehyde ethandiol acetal, with yield of over 88.2% when H2SO4 concent
rati
on=1.0 mol·L－1, Ce(SO4)2 concentration = 0.12 mol·L－1 and c
alcination temperature=550 ℃, and crystalline structure of anatase.
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Studies on the mechanism for selective catalytic reducti
on(SCR) of NOx
Lǔ Junying1 ；GONG Fan1； GUO Yaping2
  
Abstract （849）      PDF（pc） （301KB）（1423）       Save
Due to complexity of the reaction process, there exist arguments among
different researchers on the mechanism for selective catalytic reduction (SCR)
of NOx. This paper reviewed the mechanisms for SCR using different reducing ag
ents, such as H2, CO, hydrocarbon, NH3 and (NH2)2CO, including the inter
mediates
formed during SCR, such as CH3NO2，[CH2=O)、NO2［NH4+］2、NOy、CxHyOzN、CxHyOz、NO+、NCO and CtHxOyNz. Influence of oxygen vacancies and active sites
on surface of the catalysts and supports on SCR results was discussed. Trends in this f
ield were outlined, too.
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Influence of alkaline on synthesis of composite from montmorillonite and micro
porous zeolites
XU Yuandong1; MA Bo1; LING Fengxiang2; ZHANG Xiwen2; LAN Quan2;ZHANG Zhizhi2; HAN Xiaoyu1
  
Abstract （763）      PDF（pc） （326KB）（1152）       Save
Influence of alkaline on preparation of new composites from montmorill
onite and NaY zeolites or β zeolites was investigated. It was observed that m
ontmorillonite was severely corroded due to combined attack of high concentratio
n NaOH(1wt%-1.5wt%), water glass and NaAlO2；silicon and aluminum in the struc
tur
e partially entered into gel solution, resulting in change in silicon/aluminum m
olar ratio in the solution, which went beyond the range for formation of Y zeoli
te and resulted in formation of a new crystal structure. For composition of mont
morillonite and β zeolite with low alkalinity (about 0.16wt%), white carbon
black was used instead of water glass as the silicon source. XRD patterns s
howed that the composite had characteristic diffraction peaks for both β zeolite and
montmorillonite.
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Preparation of Mn(Salen)/Al-MCM-41 by host-guest interaction under microwav
e irradiation and their characterization
ZHANG Yan1； YIN Donghong2；YANG Yisi1； HUANG Chunbao1
  
Abstract （838）      PDF（pc） （325KB）（1059）       Save
A novel preparation method for Mn(Salen)/Al-MCM-41 catalysts, i.e., p
reparation via host-guest interaction between Mn(Salen) complex and mesoporous
Al-MCM-41 under microwave irradiation (MWI), was described. FT-IR, DR UV-Vis
and
TG-DSC results indicated that Mn(Salen) complex was successfully immobilized on

mesoporous Al-MCM-41 using MWI and traditional method, with stronger and broad
en
absorbance peak at 1　447.9 cm－1　under MWI. Influence of preparation me
thods on
activity and selectivity of the catalysts for styrene epoxidation was investiga
ted. Mn(Salen)/Al-MCM-41-IP showed high styrene conversion and optimum se
lectivity to phenyloxirane. The Mn(Salen)/Al-MCM-41-IP was also tested for repeated
use, with styrene conversion of 59.4% and selectivity to phenyloxirane of 78.3% aft
er three times of use.
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Preparation and photocatalytic properties of TiO2 thin films doped with vari
ous metal ions
LIU Chao;YANG Liangzhun; DU Lifen;YU Xibin;WU Zhenhua
  
Abstract （845）      PDF（pc） （330KB）（1212）       Save
Nanocrystalline titania (TiO2) thin films doped respectively with Ag+,Cu2+,Fe3+,La3+,Ce3+ and Eu3+ were prepared by
sol-gel method and characterized by means of XRD and UV-Vis. Activity of the as-prepared photocatalysts was
tested. No much difference was observed between La3+-doped TiO2 thin film
s and non-doped TiO2 thin films, with crystalline structure of anatase; doping of La3+ reduced particle diameter of TiO2 thin films. UV-Vis results showed that absorb
ence of the thin films is less than 0.1 when λ＞380 nm. Photocatalytic degradation
of methylene blue over titania thin films showed that photocatalytic degradation
rate over La3- or Fe3+-doped thin films was much higher than non
-doped titania thin films; photocatalytic activity of Ce3+- or Cu2+-doped titani
a thin films is similar to that of non-doped titania thin films; activity of the Ag+- or Eu3+-doped titania thin films was lower than non-doped titania thin films. Optimum a
mount of doped La3+ and Fe3+ was 0.6% and 1.5%, with photocatalytic
degradation rate of 92% and 82%, respectively.
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Attrition strength during preparation of FCC catalysts and its influence on ca
talytic behaviors of the catalysts
WANG Chaofeng；JIANG Bangkai；WANG Zhian
  
Abstract （785）      PDF（pc） （361KB）（1210）       Save
The catalyst loss during preparation of fluid catalytic cracking (FCC)
catalysts is mainly dependant on particle size distribution, fine powder percen
tage and activity stability of the zeolite catalyst. Attrition-resistance and c
a
talytic properties of FCC catalysts prepared by different processes were investi
gated.
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Behavior of activated alumina in FCC catalysts
LI Qiang1，2;MA Zhi1
  
Abstract （779）      PDF（pc） （260KB）（1182）       Save
Behavior of activated alumina in FCC catalysts were investigated by N2 absorption, IR and XRD. The results showed that in the condition of prepa
rati
on and application of FCC catalyst, activated alumina exhibited steady surface
area, pore volume and acidity. Phosphorus was likely to act with activated alumi
na. The interaction between phosphorus and zeolite showed an approaching to e
qu
ilibrium. Activated alumina improved pore structure of the matrix. FCC catalys
ts
prepared using aluminum sol binder were doped with phosphorus, with phosphorus
content in catalyst matrix comparable to that in zeolite active component.
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Preparation of special-shaped alumina carrier
YIN Yanguo;SUN Kang;LI Xiangjun;XU Zhifang
  
Abstract （836）      PDF（pc） （257KB）（1278）       Save
Special-shaped extrusions were prepared using commercial high and low-
silicon large-pore pseudoboehmite as the raw material, pore-expanding agents,
lu
bricating agents, and acid or organic substance as the adhesive. It was shown th
at microstructure (crystallinity, crystal integrity) of the raw material was the
main factor influencing on physicochemical properties of the carriers. Additio
n of appropriate amount of pore-expanding agents could increase the pore volume
.
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Latest researches in gold catalysts
GU Zhong-hua;LUO Lai-tao; CAI Jian-xing
  
Abstract （772）      PDF（pc） （299KB）（1200）       Save
The supports and preparation methods for gold catalysts were reviewed,
especially the researches in recent years. Preparation methods for Au catalysts
, such as deposition-precipitation, sol-gel and polymers-protection methods,
we
re described, as well as their application in hydrodechlorination and hydrodesul
furization.
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Latest researches in Pd/C catalysts
HUANG Wei; JIA Yan-qiu; Sun Sheng-kai
  
Abstract （817）      PDF（pc） （314KB）（1265）       Save
Latest developments of Pd/C catalysts for hydrogenation of terephthali
c acid were reviewed, including the properties of and preparation methods for th
e catalysts. Detailed description was given in improvements of the catalytic pro
perties, activated charcoal pretreatment and introduction of promoting solution
into the impregnation solution.
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Selective adsorption of thiophene, benzene and n-octane on Y zeolites
DUAN Lin-hai; FAN Jing-xin; SONG Li-juan; ZHANG Xiao-tong;
TANG Ke; LI Xiu-qi; SUN Zhao-lin
  
Abstract （793）      PDF（pc） （254KB）（1195）       Save
Adsorption of thiophene, benzene and octane on NaY and CeY zeolites a
t different temperature was studied using Intelligent Gravimetric Analyzer(IGA).
The results showed that saturation loadings of thiophene on NaY and CeY were si
milar at the same temperature; loadings of thiophene were higher than that of be
nzene and 1-octane; saturation loadings of benzene and 1-octane were remarkabl
y
lower on CeY zeolites than on NaY zeolites. The selectivity to adsorption of thi
ophene on CeY was superior to that on NaY.
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Advances in solid superacid catalysts and their application in isobutane/butyl
ene alkylation
CHEN Qi-feng1; WANG Ding-cong2; ZHAO Shan-lin1; LI Ping1
  
Abstract （857）      PDF（pc） （324KB）（1265）       Save
Latest researches in solid superacid catalysts and the focus and trend
s in this aspect were outlined and existing solid superacid catalysts for alkyl
ation were reviewed, including metal halides catalysts, zeolite catalysts, metal
oxid
e catalysts and heteropolyacid catalysts. Main processes, such as Alkylene, Alky
Clean, Lurgi and FBA processes were described.
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Development of an expansion bed passivation process for presulfided hydrogenat
ion catalysts
DONG Qun1;YU Chun-mei2;ZHAO Fa-jun1;WANG Jian1
  
Abstract （871）      PDF（pc） （268KB）（1247）       Save
The influences of process condition for the expansion bed process for
passivation of presifided hydrogenation catalysts on their sulfiding degree and
hydrogenation (HYD) activity were investigated. The passivated catalyst was test
ed or characterized by ONU autothermal apparatus, XRD, DTA and BET. The results
showed that passivation of the presulfided hydrogenation catalysts was necessary
; temperature, concentration of O2, reaction time and expansion rate are impor
tant influential factors on the passivation effects.
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Synthesis of ETBE catalyzed by HF modified USY zeolites
ZHAO Xin; SHEN Jian; JIAO Hong-yu
  
Abstract （861）      PDF（pc） （253KB）（1162）       Save
Etherification of ethanol and tert-butyl alcohol to ETBE（ethyl tertia
ry butyl ether), using USY zeolite midified by hydrofluoric acid as the catalys
t, was studied. The solid acid catalyst showed superior catalytic properties to
those of D005 strong acidic cation exchange resins and unmodified USY zeolite fo
r synthesis of ETBE. Influence of reaction temperature, reaction time and dosage
of HF on the reaction was investigated. The optimum condition was obtained as f
ollows: n(ethanol)∶n(tert-butyl alcohol)=2∶1, m(feed)=10 g, m(catalyst)=1
g, loadings of HF on USY zeolite=6%, reaction temperature 120　℃，reaction ti
me
3 h. Tert-butyl alcohol conversion of 55.83%, selectivity to ETBE of 95% and E
TBE yield of 52.46% were attained under the optimum condition.
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Influence of metal carbonyl in synthesis gas on methanol synthesis catalysts a
nd the countermeasures
LI Xuan-zhi1；MI Yong-feng2
  
Abstract （934）      PDF（pc） （231KB）（1607）       Save
Iron and nickel carbonyl compounds are poisons to copper-based methano
l synthesis catalysts. The mechanism for formation of iron and nickel carbonyls
and their influence on methanol synthesis catalysts were reviewed. It was pointe
d out that adoption of sorbents to remove iron and nickel carbonyl was an effect
ive way to protect synthesis catalysts.
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Kinetics of the hydrolysis of methyl acetate catalyzed by NKC-9 cation-ex
change resin
QUAN Xia; CHEN Xiao-hui; WEI Ke-mei
  
Abstract （1015）      PDF（pc） （336KB）（1336）       Save
Kinetics of the hydrolysis of methyl acetate catalyzed by NKC-9 catio
n
-exchange resin was studied using a batch-wise stirring-type reactor. Influen
ces
of reaction temperature, n(H2O)∶n(methyl acetate)
and dosage of the catalyst
on methyl acetate conversion were investigated. Kinetic model based on pseudo-
homogeneousness reaction was obtained.
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Researches in cyclohexanol dehydrogenation catalysts and
 the reaction mechanism
LIU Ning;SHI Qiu-jie
  
Abstract （886）      PDF（pc） （268KB）（1515）       Save
Researches in dehydrogenation of cyclohexanol and the side reactions w
ere reviewed, especially the advances in cyclohexanol dehydrogenation catalysts,
including the main active components, promoters and supports. The mechanism for
dehydrogenation of cyclohexanol to cyclohexanone on copper catalyst was discuss
ed. It was pointed out that supports would be the focus for development of cycl
ohexanol dehydrogenation catalysts.
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nfluence of preparation condition on the behaviours of CuO-ZnO sorbitol hydr
ogenolysis catalyst
LI Zhong-liang; LI Xiao-nian
  
Abstract （809）      PDF（pc） （338KB）（1259）       Save
CuO-ZnO catalyst for sorbitol hydrogenolysis were prepared by co-prec
i
pitation method. Influence of precipitation temperature and pH was investigated.
Dispersion, reduction behavior and surface morphology of the catalyst and i
ts precursor were characterized by XRD, H2-TPR and SEM. The results showed th
at
the dispersion and surface morphology of the catalyst were remarkably influenced
by precipitation pH, and dispersion of CuO and ZnO in the catalyst and its prec
ursor and their molecular composition were affected by precipitation temperature
. Optimum catalytic activity was attained at pH of 8.0 and precipitation tempera
ture of 70 ℃.
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Synthesis of cyclohexanone 1,2-propanediol ketal catalyzed by nanoparticle
SO42-/SnO2solid superacid
YU Ji-wei；GAO WEN-yi； REN LI-guo
  
Abstract （1034）      PDF（pc） （348KB）（1087）       Save
Nanoparticle SO42-/SnO2 solid superacid was synthe
sized using SnCl4·5H2O and cetyltrimethyl ammonium bromide（CTAB）as the template, and characteriz
ed
by XRD and TG-DTA. Cyclohexanone 1,2-propanediol ketal was synthesized from cy
cl
ohexanone and 1,2-propanediol over the catalyst. The influence of catalyst calc
i
nation temperature, reaction time， mole ratio of reactants, quantity of water-
c
arrying agent and catalyst dosage were investigated. The results showed that SO42-/SnO2 solid superacid catalyst, with nanoparticle size, exhi
bited excellen
t activity and stability in the synthesis of cyclohexanone 1,2-propanediol keta
l
, with yield of 97.2% and cyclohexanone 1,3-propanediol ketal purity of 99.2% u
nder the optimum condition.
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Application of a new carbonaceous catalyst in NH3 selective catalytic
reduction(SCR) of NOx

LIU Tao; WEI Xian-xun; ZHAI Yun-bo; LU Pei; LI Cai-ting; WANG
Xiao-gang; LIU Qiang

  
Abstract （849）      PDF（pc） （405KB）（1290）       Save
A new carbonaceous catalyst was prepared from sludge of the municipal
waste water treatment plant. The catalytic properties of the catalyst for NH3
se
lective catalytic reduction (SCR) of NOx was investigated. The experimental resu
lts showed that NOx conversion of 98.3% was attained under the following conditi
on:n(Zn)∶n(Fe)=1∶0.5, pyrolysis temperature 750 ℃, re
action temperature 4
00 ℃, oxygen concentration=15%. The catalyst samples were characterized by FTIR
、TG、SEM and BET, which showed that the catalyst had abundant pore structures,
active particles and surface functional groups, with surface area up to 307 m2
·g－1.
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Preparation and properties of foam metal and its applica
tion in catalysis
HU Hai;XIAO Wen-jun;SHANGGUAN Wen-feng
  
Abstract （837）      PDF（pc） （330KB）（2146）       Save
Foam metal, as a new-type functional material, has unique characteris
t
ics and structure. The preparation techniques, properties of foam metal and its
a
pplication in catalytic reaction were reviewed. Preparation techniques for foam
metal include forming, sintering, casting and deposition. Foam metal can be used
as both carrier and catalyst.
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Effects of supports on catalytic properties of Ni-B amorphous alloy catalyst 
for liquid-phase hydrogenation of o-chloronitrobenzene
FANG Yong-bin
  
Abstract （767）      PDF（pc） （349KB）（1185）       Save
Ni-B amorphous alloy catalysts supported on carbon nanutubes (CNTs),
γ-Al2O3, activated carbon (AC) and SiO2, as the catalyst for liquid-pha
se hydro
genation of [WTBX]o[WTBZ]-chloronitrobenzene, were prepared by impregnation-ch
emical-reducti
on method and characterized by TEM and SEM. The results showed that，under the s
ame reaction condition，conversion of the substrate over Ni-B catalyst supporte
d
on γ-Al2O3and SiO2 was relatively lower (40% and 74.5%, respectively)
while s
electivity to the target product was high(96.8% and 94.3%, respectively); conve
rsion of the substrate and selectivity to the target product over Ni-B catalyst

supported on CNTs and AC were high (conversion of over 85%, and selectivity of 9
5.5% and 90.4%, respectively). The causes behind the difference was discussed f
rom the aspect of structure of the supports.
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Factors influencing the structure of hydroxyl-aluminium cross-linked montmor
illonite
HE Chang-hong;LI Feng-xuan;HE Yu-lian;CUI Xi-hong
  
Abstract （798）      PDF（pc） （273KB）（1216）       Save
Hydroxyl-aluminium cross-linked montmorillonite was prepared and char
ac
terized by SEM，BET and XRD techniques.The results showed that OH-/Al3+
molar ra
tio, calcination temperature and acidification concentration had certain effect
on the structure; aging time of the cross-linking agent also had effects on yi
eld of the cross-linked montmorillonite.
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Synthesis and characterization of copper(Ⅱ) complexes with skiff base and tet
rahydro skiff base encapsulated in zeolite-Y
WANG Run-ping; SUO Hai-yun; MAO Shu-hong;DUAN Xiu-qin
  
Abstract （1102）      PDF（pc） （274KB）（1189）       Save
Three kinds of skiff bases，H2L:H2L1H2Salpn, H2L2=H2S
alcyhexen，H2L3=H2Salen，and their tetrahydro skiff base H2(H4)L were synthesized. Y z
eolite e
ncapsulated with CuL and Cu(H4)L were prepared by flexible ligand method a
nd cha
racterized by FTIR. The experimental results showed 　that the Cu(H4)L encapsu
lated in
Y zeolite exhibited higher activity for cyclohexane oxidation with H2O2 th
an CuL encapsulated in Y zeolite.
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Advances in the application of MCM-41 mesoporous zeolites
WANG Yingjun;JIN Lili;LIU Jinxiang
  
Abstract （842）      PDF（pc） （271KB）（1083）       Save
The properties, synthesis and application of MCM-41 mesoporous zeolit
es in catalysis, adsorption, nanometer material, optical material and environment
al protection were reviewed, and their prospects were discussed.
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Latest researches in synthesis of dimethyl carbonate over transesterification
catalysts
ZHAO Feng;LIU Shaoying;LI Jianguo;YANG Xiangui;LIAO Maohua
  
Abstract （931）      PDF（pc） （342KB）（2397）       Save
Latest researches in the catalysts for synthesis of dimethyl carbonate
(DMC) from ethylene carbonate (or propylene carbonate) and methanol were reviewed,especially the preparation and catalytic properties of heterogeneous catalysts,such as metal oxides, ion exchange resins and supported catalysts. The life cycle of metal oxide catalysts is shorter due to chemical reactions occurring during operation. The stability of ion exchange resins is relatively poor and can not be used at high temperature for long term. Loss of active components is a problem with supported catalysts. Heterogeneous catalysts, featuring easy separation from the products, represent the trend in this field.
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Effect of promoters on reaction performance of FischerTrop
sch synthesis over Fe1-xObased fused iron catalyst
CAI Liping; LIU Huazhang;TANG Haodong;HU Zhangneng;ZHENG Yifan;HUANG Wenhong; YANG Xiazhen
  
Abstract （985）      PDF（pc） （326KB）（1246）       Save
The effects of MnO and M2O3 promoters on FischerTropsch synthesis be
haviors over Fe1-xOBased fused iron catalyst was investigated by mea
ns of CO hydrogenation, XRD and COTPD techniques. The results showed that selectivity tomethane decreased，CO+H2 conversion decreased, and selectivity to light olefins increased with the addition of MnO. Selectivity to methane decreased from 21.18% to 18.84%,light olefins yield remarkably increased from 31.20 g·mm-3 to 40.91 g·mm-3, and CC5＋ yield increased from 45.52 gmm to 59.61 g·mm-3 with the addition of 0.5%-1.0wt％ rare earth oxide of M2O3(M=La,Nd,Pu,etc).However, CO+H2 conversion declined to 30.29％wit
h the addition of 1.5wt％M2O3. XRD results indicated that, with the addi
tion of MnO, Mn2+ replaced Fe2+ in the lattice of Fe1-xO, and lattic
e parameter of Fe1-xO increased. New crystalline phase formed with the addition of M2O3. COTPD results indicated that the area of desorption peak observably decreased with the addition of M2O3 or MnO.
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Latest researches in direct coal liquefaction catalysts
FAN Limin;GAO Junwen;ZHANG Yong
  
Abstract （959）      PDF（pc） （324KB）（1613）       Save
Coal liquefaction or direct CTL is a way for relaxing the shortage of
oil resources in China. Iron catalyst has been focus as a direct CTL catalyst fo
r its high efficiency, lower cost and less influence on the environment. Oth
er direct coal liquefication catalysts include Sn and Zn catalysts, iodine catal
ysts, alkali metals hydroxide or carbonate catalysts, Cr-Mo-Ⅷ metals cataly
sts and sulfur transfer catalysts. Latest researches in coal liquefication, such
as iron catalysts, the preparation techniques, catalyst recycle, catalyst pretre
atment and the catalytic reactor, were reviewed.
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Catalytic cracking of FCC light gasoline over HZSM-5 to
produce propylene
WANG Min;CHEN Jinpeng;WANG Haiyan;WEI Min;MA Jun
  
Abstract （910）      PDF（pc） （246KB）（1221）       Save
Catalytic cracking of FCC light gasoline was investigated on a small scale fixed bed reactor over HZSM5 catalyst, including the influences of reacti
on temperature, LHSV, Si/Al molar ratio in HZSM-5 and content of Al2O3 carr
ier on the catalytic cracking behaviors and yield of propylene. The results showed that reaction temperature and LHSV had remarkable influence on the product distribution and yield of propylene. The catalysts with higher Si/Al molar ratio exhibited higher selectivity to propylene than those with lower Si/Al molar ratio. Addition of appropriate percentage of Al2O3 into HZSM-5 enhanced the yield of propylene. Properly optimized reaction condition can enhance catalytic cracking behavior of the catalyst, inhibit hydrogen transfer reaction and thus greatly improve the selectivity to propylene. Under 500 ℃, 0.2 MPa and LHSV=4 h－1, the propylene yield of 37.56% was attained over HZSM-5 with n(SiO2)∶n(Al2O3)=20; the yield of propylene increased to 38.26% when adding 30% mass percentage of Al2O3.
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Deactivation and regeneration of FCC catalysts
LI Yuchen，LU Shanxiang
  
Abstract （954）      PDF（pc） （323KB）（1466）       Save
The researches in deactivation of FCC catalysts in recent years, espec
ially that caused by metal contamination and coke formation, were reviewed. Advances in the regeneration and utilization of equilibrium FCC catalysts were discussed in detail, including its prospects.
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The commercial application of zeolite catalyst in
Taoyuan refinery of CPC in Taiwan
ZOU Wushen;WANG Shengliang;LI Yinlian;ZHOU Liang
  
Abstract （1038）      PDF（pc） （210KB）（1276）       Save
CC-20D fluid catalytic cracking (FCC) catalyst，developed by RIPP (Res
earch Institute of Petroleum Processing) and manufactured by Sinopec Catalyst Company Changling Division,using PSRY and REUSY zeolite as the main active components,was applied successfully to China Petroleum Corporation (CPC) Taoyuan Refinery.Compared with the catalyst from abroad,“light oil+LPG” yield increased by 1.05 percentage point, propylene yield increased by 1.38 percentage point, conversion increased by 4.93 percentage points, and RON of gasoline attained 94.0.
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Synthesis of isopropyl chloroacetate catalyzed by acidic ionic liquids
ZHU Xiangqin;GUI Jianzhou;LIU Dan;ZHANG Xiaotong;SONG Lijuan;SUN Zhaolin
  
Abstract （924）      PDF（pc） （278KB）（1349）       Save
Synthesis of isopropyl chloroacetate catalyzed by acidic ionic liquids
(IL) was studied, including influences of different ionic liquids, reaction tem
perature, reaction time and quantity of ionic liquid (mole ratio of reactant to
IL). Isopropanol conversion of 91% and the selectivity to isopropyl chloroaceta
te of 100% were attained under optimum reaction condition as follows:〖WTBX〗n(reactant)∶n(IL)=5∶1, 60 ℃, 4 h. The ionic liquid can be used repe
atedly for five times without remarkable loss of catalytic activity.
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