Water–gas shift reaction over gold nanoparticles dispersed on nanostructured CeOx–TiO2(110) surfaces: Effects of high ceria coverage

Grinter, D. C.; Park, J. B.; Agnoli, S.; Evans, J.; Hrbek, J.; Stacchiola, D. J.; Senanayake, S. D.; Rodriguez, J. A.

doi:10.1016/j.susc.2015.10.002

Title: Water–gas shift reaction over gold nanoparticles dispersed on nanostructured CeO_x–TiO₂(110) surfaces: Effects of high ceria coverage

Journal Article · Mon Aug 01 00:00:00 EDT 2016 · Surface Science

DOI:https://doi.org/10.1016/j.susc.2015.10.002· OSTI ID:1303023

Grinter, D. C. ^[1]; Park, J. B. ^[1]; Agnoli, S. ^[1]; Evans, J. ^[2]; Hrbek, J. ^[1]; Stacchiola, D. J. ^[1]; Senanayake, S. D. ^[1]; Rodriguez, J. A. ^[1]

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 CeO_x 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/CeO_x/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/CeO_x/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.

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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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Cited by: 12 works

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On the stability of hydroxyl groups on substituted titania Sai Phani Kumar, V.; Deshpande, Parag A. Physical Chemistry Chemical Physics, Vol. 22, Issue 3 https://doi.org/10.1039/c9cp05525h	journal	January 2020
Development and characterization of novel combinations of Ce‐Ni‐MFI solids for water gas shift reaction Alamolhoda, Sarah; Vitale, Gerardo; Hassan, Azfar The Canadian Journal of Chemical Engineering, Vol. 97, Issue 1 https://doi.org/10.1002/cjce.23201	journal	April 2018
Improving the activity of gold nanoparticles for the water-gas shift reaction using TiO ₂ –Y ₂ O ₃ : an example of catalyst design Plata, Jose J.; Romero-Sarria, Francisca; Amaya Suárez, Javier Physical Chemistry Chemical Physics, Vol. 20, Issue 34 https://doi.org/10.1039/c8cp03706j	journal	January 2018

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Title: Water–gas shift reaction over gold nanoparticles dispersed on nanostructured CeOx–TiO2(110) surfaces: Effects of high ceria coverage

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Title: Water–gas shift reaction over gold nanoparticles dispersed on nanostructured CeO_x–TiO₂(110) surfaces: Effects of high ceria coverage