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Selective production of aromatics from CO2

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Abstract

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 Brønsted 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 (C2[double bond, length as m-dash]–C4[double bond, length as m-dash]) 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.

Graphical abstract: Selective production of aromatics from CO2

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Publication details

The article was received on 28 Sep 2018, accepted on 25 Nov 2018 and first published on 26 Nov 2018


Article type: Paper
DOI: 10.1039/C8CY02024H
Citation: Catal. Sci. Technol., 2019, Advance Article
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    Selective production of aromatics from CO2

    Y. Xu, C. Shi, B. Liu, T. Wang, J. Zheng, W. Li, D. Liu and X. Liu, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C8CY02024H

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