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Selective hydrogenation of CO2 to methanol catalyzed by Cu supported on rod-like La2O2CO3

Abstract

Cu-based catalysts have long been applied to convert CO2 and H2 into methanol and their performances are well known to be markedly influenced by support and promoter. Herein, several Cu-based catalysts supported on lanthanum oxides were fabricated by varying preparation methods, characterized by XRD, TEM, ICP-AES, N2 physisorption, N2O chemisorption, CO2 chemisorption, XPS, and CO2-TPD. The results showed that the as-prepared Cu supported on rod-like La2O2CO3 (La2O2CO3-R) exhibited the highest TOFCu, methanol selectivity and yields of methanol for the hydrogenation of CO2 to methanol. Distinct from conventional promoter addition, the local formation of a new type of Cuδ+ species at Cu/La2O2CO3-R interfaces and original adsorption performance of basic oxide are the two key factors relating to the catalytic performance. Cu supported on La2O2CO3-R with higher content of Cuδ+ species and stronger adsorption for CO2 leading to the superior catalytic activities. DRIFTS studies revealed that the generation of synergetic basic sites at the interfacial areas can increase the intrinsic activity of Cu-based methanol catalysts by moderately and selectively stable methanol synthesis intermediates. This work provides new insights on the CO2 activation over basic oxides-supported Cu catalysts and the finding of metal-support interactions between Cu and lanthanum oxides is beneficial for the rational design of stable Cu-based catalysts.

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Publication details

The article was received on 29 Sep 2017, accepted on 03 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7CY01998J
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Selective hydrogenation of CO2 to methanol catalyzed by Cu supported on rod-like La2O2CO3

    K. Chen, X. Duan, H. Fang, X. Liang and Y. Yuan, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C7CY01998J

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