期刊
NATURE CHEMISTRY
卷 10, 期 8, 页码 804-812出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41557-018-0081-0
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资金
- Netherlands Organization for Scientific Research (NWO)
- Fund for Scientific Research: Flanders (FWO)
- Belgian American Educational Foundation
- Research Board of Ghent University (BOF)
- BELSPO [IAP/7/05]
- European Union's Horizon 2020 research and innovation programme (ERC grant) [647755-DYNPOR]
- Research Foundation: Flanders (FWO)
The combination of well-defined acid sites, shape-selective properties and outstanding stability places zeolites among the most practically relevant heterogeneous catalysts. The development of structure-performance descriptors for processes that they catalyse has been a matter of intense debate, both in industry and academia, and the direct conversion of methanol to olefins is a prototypical system in which various catalytic functions contribute to the overall performance. Propylene selectivity and resistance to coking are the two most important parameters in developing new methanol-to-olefin catalysts. Here, we present a systematic investigation on the effect of acidity on the performance of the zeolite 'ZSM-5' for the production of propylene. Our results demonstrate that the isolation of Bronsted acid sites is key to the selective formation of propylene. Also, the introduction of Lewis acid sites prevents the formation of coke, hence drastically increasing catalyst lifetime.
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