Activation of Gold on Metal Carbides: Novel Catalysts for C1 Chemistry
This article presents a review of recent uses of Au-carbide interfaces as catalysts for C1 Chemistry (CO oxidation, low-temperature water-gas shift and CO2 hydrogenation). The results of density-functional calculations and photoemission point to important electronic perturbations when small two-dimensional clusters of gold are bounded to the (001) surface of various transition metal carbides (TiC, ZrC, VC, Ta C and δ-MoC). On these surfaces, the C sites exhibited strong interactions with the gold clusters. On the carbide surfaces, the Au interacts stronger than on oxides opening the door for strong metal-support interactions. So far, most of the experimental studies with well-defined systems have been focused on the Au/TiC, Au/δ-MoC and Au/β-Mo2C interfaces. Au/TiC and Au/ δ-MoC are active and stable catalysts for the low-temperature water-gas shift reaction and for the hydrogenation of CO2 to methanol or CO. A systematic comparison of the behavior of Au/β-Mo2C and Au/δ-MoC catalysts provides evidence of the impact of the metal/carbon ratio in the carbide on the performance of the catalysts. The present results show that this ratio governs the chemical behavior of the carbide and the properties of the admetal, up to the point of being able to switch the rate and mechanism of C1 processes.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1581650
- Alternate ID(s):
- OSTI ID: 1579501
- Report Number(s):
- BNL-212411-2019-JAAM; 875
- Journal Information:
- Frontiers in Chemistry, Journal Name: Frontiers in Chemistry Vol. 7; ISSN 2296-2646
- Publisher:
- Frontiers Media SACopyright Statement
- Country of Publication:
- Switzerland
- Language:
- English
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