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Active sites in CO2 hydrogenation over confined VOx-Rh catalysts.
- Source :
- SCIENCE CHINA Chemistry; Dec2019, Vol. 62 Issue 12, p1710-1719, 10p
- Publication Year :
- 2019
-
Abstract
- Metal oxide-promoted Rh-based catalysts have been widely used for CO<subscript>2</subscript> hydrogenation, especially for the ethanol synthesis. However, this reaction usually suffers low CO<subscript>2</subscript> conversion and alcohols selectivity due to the formation of byproducts methane and CO. This paper describes an efficient vanadium oxide promoted Rh-based catalysts confined in mesopore MCM-41. The Rh-0.3VO<subscript>x</subscript>/MCM-41 catalyst shows superior conversion (~12%) and ethanol selectivity (~24%) for CO<subscript>2</subscript> hydrogenation. The promoting effect can be attributed to the synergism of high Rh dispersion by the confinement effect of MCM-41 and the formation of VO<subscript>x</subscript>-Rh interface sites. Experimental and theoretical results indicate the formation of til-CO at VO<subscript>x</subscript>-Rh interface sites is easily dissociated into *CH<subscript>x</subscript>, and then *CH<subscript>x</subscript> can be inserted by CO to form CH<subscript>3</subscript>CO*, followed by CH<subscript>3</subscript>CO* hydrogenation to ethanol. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16747291
- Volume :
- 62
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- SCIENCE CHINA Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 140453671
- Full Text :
- https://doi.org/10.1007/s11426-019-9590-6