期刊
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
卷 42, 期 1, 页码 227-238出版社
HIGHER EDUCATION PRESS
DOI: 10.7503/cjcu20200413
关键词
Methanol to olefins; ZSM-5 zeolite; Acid sites distribution; Regulation
资金
- National Natural Science Foundation of China [U1910203, 21802157, 21991092, 21991090]
- Natural Science Foundation of Shanxi Province, China [201901D211581]
- Excellent Doctoral Student Award and Subsidy Program of Shanxi Province, China [BK2018001]
- Autonomous Research Project of State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy Sciences [2020BWZ004]
Adding Na+ ions increases the concentration of acid sites in the intersection cavity of ZSM-5, promoting the production of ethene; on the other hand, a Na+ ions free synthesis system is more conducive to producing more propene and higher alkenes.
The catalytic performance and reaction mechanism of ZSM-5 zeolite in the conversion of methanol to olefins (MTO) is closely related to the distribution of acid sites in framework. In this work, it was demonstrated that adding proper content of Na+ ions during synthesis can increase the proportion of acid sites in the intersection cavity of ZSM-5; the concentration of acid sites in the intersection cavity can promote the formation of higher polymethylbenzene (polyMBs) and the propagation of aromatic cycle, forming more ethene. In contrast, in the Na+ ions free synthesis system, more acid sites are distributed in the sinusoidal and straight channels of ZSM-5, which is more encouraging for the alkene cycle and conduces to producing more propene and higher alkenes(C3+).
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