Water–gas shift reaction over gold nanoparticles dispersed on nanostructured CeOx–TiO2(110) surfaces: Effects of high ceria coverage
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Central Univ. of Venezuela, Caracas (Venezuela)
In this study, scanning tunnelling microscopy has been used to study the morphology of an overlayer of ceria in contact with a TiO2(110) substrate. Two types of domains were observed after ceria deposition. An ordered ceria film covered half of the surface and high-resolution imaging suggested a near-c(6 × 2) relationship to the underlying TiO2(110)-(1 × 1). The other half of the surface comprised CeOx nanoparticles and reconstructed TiOx supported on TiO2(110)-(1 × 1). Exposure to a small amount of gold resulted in the formation of isolated gold atoms and small clusters on the ordered ceria film and TiO2(110)-(1 × 1) areas, which exhibited significant sintering at 500 K and showed strong interaction between the sintered gold clusters and the domain boundaries of the ceria film. The Au/CeOx/TiO2(110) model system proved to be a good catalyst for the water–gas shift (WGS) exhibiting much higher turnover frequencies (TOFs) than Cu(111) and Pt(111) benchmarks, or the individual Au/TiO2(110) and Au/CeO2(111) systems. For Au/CeOx/TiO2(110) catalysts, there was a decrease in catalytic activity with increasing ceria coverage that correlates with a reduction in the concentration of Ce3+ formed during WGS reaction conditions.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704; SC0012704
- OSTI ID:
- 1303023
- Alternate ID(s):
- OSTI ID: 1333203; OSTI ID: 1373613
- Report Number(s):
- BNL-112519-2016-JA; BNL-113208-2016-JA; R&D Project: CO009; KC0302010
- Journal Information:
- Surface Science, Vol. 650, Issue C; ISSN 0039-6028
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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