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Direct and Selective Hydrogenation of CO2 to Ethylene and Propene by Bifunctional Catalysts

Abstract

Reduction of CO2 by H2 produced from renewable electricity in large scales would benefit both the carbon recycling as well as the H2 storage and transportation. Among the various CO2 hydrogenation reaction products, light olefins such as ethylene and propylene, are very important intermediates in chemical industry. However, there does not exist very efficient catalytic systems that are able to drive the CO2 hydrogenation reactions selectively to make olefins although they are thermodynamically favorable. In this work, we demonstrate a selective hydrogenation process to directly convert CO2 to light olefins via a bifunctional catalyst composed of a methanol synthesis (In2O3/ZrO2) catalyst and a “methanol to olefins” (SAPO-34) catalyst. Under typical reaction conditions (e.g., 15 bar, 400 oC, and space velocity of 12 〖L g〗_cat^(-1) h^(-1)), light olefins (ethylene and propylene) with selectivity of 80-90 % in hydrocarbons can be obtained at CO2 conversion of ~ 20 %. This is the highest selectivity ever reported to the best of our knowledge, which significantly surpasses the value obtained over conventional iron or cobalt CO2 Fisher-Tropsch synthesis catalysts (typically less than 50 %). Moreover, our designed bifunctional catalyst also shows good catalytic stability, which can run 50 h continuously without obvious activity decay. Our work provides an important contribution for CO2 conversion to value-added chemicals.

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Publication details

The article was received on 31 Jul 2017, accepted on 08 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01549F
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Direct and Selective Hydrogenation of CO2 to Ethylene and Propene by Bifunctional Catalysts

    J. Gao, C. Jia and B. Liu, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01549F

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