Zhang Yuan1, Lu Yongbin1, Zhang Wei1,*, Li Si2, Zhang Xiongfu2
1.Research Institute of Yanchang Petroleum (Group) Co.,Ltd.,Xi’an 710075,Shaanxi,China;
2.State Key Laboratory of Fine Chemicals,School of Chemical Enginerring,Dalian University of Technology,Dalian 116024,Liaoning,China
Abstract
ZSM-5 molecular sieves were prepared by choosing the reasonable ratios of reactants and hydrothermal synthetic method.The influence of SiO2/Al2O3 molar ratios,H2O/SiO2 molar ratios,crystallization time and temperatures on the synthesis of ZSM-5 molecular sieves was investigated.The as-prepared ZSM-5 molecular sieves were characterized by X-ray powder diffraction and scanning electron microscope.The results showed that the prepared ZSM-5 molecular sieves possessed typical structure of ZSM-5 molecular sieve with uniform and monodisperse crystals.ZSM-5 molecular sieves with particle size of (350-650) nm were synthesized by controlling different factors.
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Nanosized ZSM-5 was synthesized and used for straight run gasoline reforming. Nanosized β was synthesized and used for the alkylation of benzene and ethylene in ethylbenzene production. Nanosized titanosilicate molecular sieve with a hollow structure (HTS) was synthesized and used for the oximation of cyclohexanone. Nanosized silicalite-1 was synthesized and used for the gas phase Beckmann rearrangement of cyclohexanone oxime in caprolactam production. Recent progress in the synthesis and application of nanosized ZSM-5, β, TS-1, and silicalite-1 were reviewed. The catalyst lifetimes were prolonged when nanosized molecular sieves were used as petroleum refining and petrochemical catalysts.
State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China