期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 9, 期 3, 页码 593-610出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cy02024h
关键词
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资金
- National Natural Science Foundation of China [21606108, 21576119, 21878127]
- Natural Science Foundation of Jiangsu Province [BK20160161, BK20151125]
- Fundamental Research Funds for the Central Universities [JUSRP51720B, JUSRP11709]
- Program of Introducing Talents of Discipline to Universities [B13025]
Direct catalytic hydrogenation of CO2 to value-added aromatics, particularly the desirable para-xylene, not only provides a complementary route to the aromatics market but also helps reduce emissions of the greenhouse gas CO2. Herein, we report a composite Na/Fe and HZSM-5 catalyst system used for the direct and selective production of aromatics from CO2. Over the composite catalyst, the selectivity to aromatics in liquid hydrocarbons could reach over 94% under industrially relevant conditions, and the selectivity to para-xylene in total xylenes remarkably increased from 24-26% to 70% as HZSM-5 zeolite was coated with SiO2. Experiments and DFT calculations confirmed that the Na-promoted Fe catalyst and HZSM-5 with high Bronsted acidity are key factors for enhancing the CO2 conversion and aromatics synthesis. Specifically, SiO2-coated HZSM-5 can suppress the isomerization of para-xylene and para-ethyltoluene, which are preferentially formed in the inner channels of HZSM-5, and over a 100 h test, the composite catalyst showed highly stable CO2 conversion with relatively stable aromatics synthesis. Interestingly, in the case of SiO2-coated HZSM-5, the light olefins (C-2(=)-C-4(=)) remained largely in the gas phase rather than becoming isomerized and hydrogenated into light paraffins. This study opens a new way to reduce CO2 emissions via the efficient production of aromatics over a simple composite catalyst system.
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