期刊
FUEL PROCESSING TECHNOLOGY
卷 157, 期 -, 页码 99-107出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2016.12.006
关键词
Methanol to aromatics; H-ZSM-5; Zn/H-ZSM-5; Crystal size; Zinc species
资金
- National Natural Science Foundation of China [21273264, 21273263, 21227002, 21573270, U1510104]
- Natural Science Foundation of Shanxi Province of China [2013021007-3, 2015021003]
- CAS-SAFEA International Partnership Program for Creative Research Teams
H-ZSM-5 zeolites with a uniform crystal size from 0.25 to 2 pm were obtained by adding colloidal silicalite-1 seed in the synthesis gel; with H-ZSM-5 as the support, Zn/H-ZSM-5 was prepared by incipient wet impregnation. The influence of crystal size on the state of Zn species and its relation to the catalytic performance of Zn/H-ZSM-5 in the conversion of methanol to aromatics (MTA) was then investigated. The results illustrated that the state of Zn species and catalytic performance of Zn/H-ZSM-5 are closely related to the crystal size, though the crystal size has little influence on the overall acidity. There exist mainly two types of zinc species, viz., ZnO and ZnOH+; Zn/H-ZSM-5 with smaller crystal size is provided with more ZnOH+ species. The selectivity to aromatics and catalyst stability can be improved greatly by using small crystal Zn/H-ZSM-5. A good linear correlation is observed between the amount of ZnOH+ species and the selectivity to aromatics, suggesting that ZnOH+ species plays an important role in enhancing the dehydrogenation of alkanes and aromatization bf alkenes to aromatics. As a result, small crystal Zn/H-ZSM-5 with large portion of ZnOH+ species exhibits high selectivity to aromatics and long lifetime in MTA. (C) 2016 Elsevier B.V. All rights reserved.
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