期刊
JOURNAL OF CATALYSIS
卷 381, 期 -, 页码 347-354出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.11.015
关键词
Multi-functional catalysis; Solid state NMR; Catalyst characterization; Zeolite modification; CO2 valorization; Fischer-Tropsch synthesis
资金
- King Abdullah University of Science and Technology (KAUST)
Utilization of multi-functional catalysis is fast becoming the method of choice to boost the production of valuable chemicals from CO2. Here, we present a possible route to increase selectivity to light olefins by modifying the acidity of the zeolitic component of a multi-functional catalyst. This is carried out via incorporation of Ca on the zeolite ZSM-5 by incipient wetness impregnation. This incorporation, while straightforward, leads to reduced Bronsted acidity and the formation of multiple Lewis acidic species inside the zeolite. NMR investigations point towards incorporation of CO/ketene into the zeolite leading to the creation of surface acetate species, which augments the production of light olefins. Additionally, the suppression of oligomerization due to the reduction of Bronsted acid sites also produces more light olefins at the expense of longer chain hydrocarbons. (C) 2019 Elsevier Inc. All rights reserved.
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