Direct and Oriented Conversion of CO2 into Value-Added Aromatics |
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Authors: | Yang Wang Weizhe Gao Shun Kazumi Hangjie Li Prof?Dr Guohui Yang Prof?Dr Noritatsu Tsubaki |
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Institution: | Department of Applied Chemistry, Graduate School of Engineering, University of Toyama, Gofuku 3190, Toyama, 930-8555 Japan |
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Abstract: | The oriented conversion of CO2 into target high-value chemicals is an effective way to reduce carbon emissions, but still presents a challenge. In this communication, we report the oriented conversion of CO2 into value-added aromatics, especially para-xylene, in a single pass by combining core–shell structured Zn-doped H-ZSM-5 (Zn-ZSM-5@SiO2) and a Cr2O3 component. Through precise regulation of the acidity of Zn-ZSM-5@SiO2, high para-xylene selectivity (38.7 % in the total products) at a CO2 conversion of 22.1 % was achieved. Furthermore, a CO2-assisted effect in the synthesis of aromatics during the tandem process has been clarified through a control experiment. The CO2 reactant can act as a hydrogen acceptor to accelerate the dehydrogenation of alkenes, intermediates in the synthesis of aromatics, thereby increasing the driving force towards aromatics in the tandem reaction process. |
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Keywords: | bifunctional catalysts CO2 conversion green chemistry xylenes zeolites |
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