Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 337, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.123013
Keywords
CO2 hydrogenation; Higher alcohol; CuFe catalyst; Cr modification; Reaction mechanism
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In this study, various Cr-modified CuFe catalysts were prepared and their catalytic performance and reaction mechanism in CO2 hydrogenation to C2+OH were investigated. The introduction of small amounts of Cr enhanced the interaction between Cu and Fe species, alleviating CO over-dissociation and inhibiting the generation of iron carbides. The Cr(1%)-CuFe catalyst exhibited high CO2 conversion, C2+OH selectivity, and space-time yield (STY).
CO2 hydrogenation to higher alcohols (C2+OH) is a promising approach to achieve carbon recycling, but it is a challenge due to complex reaction network. Herein, various Cr-modified CuFe (Cr(x)-CuFe) catalysts were prepared, and their catalytic performance and reaction mechanism in CO2 hydrogenation to C2+OH were investigated. Introduction of small amounts of Cr enhances the interaction between Cu and Fe species, which alleviates CO over-dissociation and inhibits generation of iron carbides. In contrast, more acetate and acetal-dehyde intermediates are produced via promoting the reaction of CHx with non-dissociated CO. Cr(1%)-CuFe showed CO2 conversion, C2+OH selectivity and space-time yield (STY) as high as 38.4%, and 29.2% and 104.1 mg gcat 1 h 1, at 320 degrees C, 4.0 MPa and GHSV of 6000 mL gcat 1 h 1. Interestingly, C2+OH STY was further elevated to 268.5 mg gcat 1 h 1, with a catalytic lifetime of at least 120 h, when GHSV was increased to 48000 mL gcat 1 h 1.
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