期刊
CHEMCATCHEM
卷 5, 期 6, 页码 1517-1523出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201200691
关键词
isomerizationzeolites
资金
- NSFC [U1162201, 21003107]
- State Basic Research Project of China [2009CB623507]
- Fundamental Research Funds for the Central Universities [2010QNA3035]
ZSM-5 zeolite crystals with controllable b-axis length (sheet-like, S-ZSM-5; chain-like, C-ZSM-5) have been synthesized by using urea and starch as additives in the starting aluminosilicate gels. X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images show that these zeolite samples have good crystallinity. Transmission electron microscopy (TEM) images show that there is a strong chemical interaction between the stacked crystals in C-ZSM-5 samples. N2 sorption isotherms indicate that C-ZSM-5 crystals are mesoporous. Catalytic tests for the formation of p-xylene from m-xylene isomerization show that, compared with other zeolite catalysts, C-ZSM-5 catalysts give both high conversion and improved p-xylene selectivity, which are attributed to the combination of relatively long b-axis length and the present mesoporosity in the crystals. The improvement of p-xylene selectivity in catalytic m-xylene isomerisation is of great importance for selective industrial production of p-xylene in the future.
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