Enhanced activity and stability of gold/ceria-titania for the low-temperature water-gas shift reaction

James H. Carter; Parag M. Shah; Ewa Nowicka; Simon J. Freakley; David J. Morgan; Stan Golunski; Graham J. Hutchings

doi:10.3389/fchem.2019.00443

Enhanced activity and stability of gold/ceria-titania for the low-temperature water-gas shift reaction

James H. Carter, Parag M. Shah, Ewa Nowicka, Simon J. Freakley, David J. Morgan, Stan Golunski, Graham J. Hutchings

Department of Chemistry

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

Gold supported on ceria-zirconia is one of the most active low temperature water-gas shift catalysts reported to date but rapid deactivation occurs under reaction conditions. In this study, ceria-titania was evaluated as an alternative catalyst support. Materials of different Ce:Ti compositions were synthesized using a sol-gel methodology and gold was supported onto these using a deposition-precipitation method. They were then investigated as catalysts for the low-temperature water-gas shift reaction. Au/Ce_0.2Ti_0.8O₂ exhibited superior activity and stability to a highly active, previously reported gold catalyst supported on ceria-zirconia. High activity and stability was found to be related to the support comprising a high number of oxygen defect sites and a high specific surface area. These properties were conducive to forming a highly active catalyst with well-dispersed Au species.

Original language	English
Article number	443
Number of pages	5
Journal	Frontiers in Chemistry
Volume	7
Issue number	JUN
DOIs	https://doi.org/10.3389/fchem.2019.00443
Publication status	Published - 14 Jun 2019

Keywords

Ceria-titania
Ceria-zirconia
Gold
Heterogeneous catalysis
Nanoparticles
Water-gas shift

ASJC Scopus subject areas

Chemistry(all)

Access to Document

10.3389/fchem.2019.00443Licence: CC BY

Link to publication in Scopus

Cite this

Carter, J. H., Shah, P. M., Nowicka, E., Freakley, S. J., Morgan, D. J., Golunski, S., & Hutchings, G. J. (2019). Enhanced activity and stability of gold/ceria-titania for the low-temperature water-gas shift reaction. Frontiers in Chemistry, 7(JUN), [443]. https://doi.org/10.3389/fchem.2019.00443

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abstract = "Gold supported on ceria-zirconia is one of the most active low temperature water-gas shift catalysts reported to date but rapid deactivation occurs under reaction conditions. In this study, ceria-titania was evaluated as an alternative catalyst support. Materials of different Ce:Ti compositions were synthesized using a sol-gel methodology and gold was supported onto these using a deposition-precipitation method. They were then investigated as catalysts for the low-temperature water-gas shift reaction. Au/Ce0.2Ti0.8O2 exhibited superior activity and stability to a highly active, previously reported gold catalyst supported on ceria-zirconia. High activity and stability was found to be related to the support comprising a high number of oxygen defect sites and a high specific surface area. These properties were conducive to forming a highly active catalyst with well-dispersed Au species.",

keywords = "Ceria-titania, Ceria-zirconia, Gold, Heterogeneous catalysis, Nanoparticles, Water-gas shift",

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AU - Carter, James H.

AU - Shah, Parag M.

AU - Nowicka, Ewa

AU - Freakley, Simon J.

AU - Morgan, David J.

AU - Golunski, Stan

AU - Hutchings, Graham J.

PY - 2019/6/14

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N2 - Gold supported on ceria-zirconia is one of the most active low temperature water-gas shift catalysts reported to date but rapid deactivation occurs under reaction conditions. In this study, ceria-titania was evaluated as an alternative catalyst support. Materials of different Ce:Ti compositions were synthesized using a sol-gel methodology and gold was supported onto these using a deposition-precipitation method. They were then investigated as catalysts for the low-temperature water-gas shift reaction. Au/Ce0.2Ti0.8O2 exhibited superior activity and stability to a highly active, previously reported gold catalyst supported on ceria-zirconia. High activity and stability was found to be related to the support comprising a high number of oxygen defect sites and a high specific surface area. These properties were conducive to forming a highly active catalyst with well-dispersed Au species.

AB - Gold supported on ceria-zirconia is one of the most active low temperature water-gas shift catalysts reported to date but rapid deactivation occurs under reaction conditions. In this study, ceria-titania was evaluated as an alternative catalyst support. Materials of different Ce:Ti compositions were synthesized using a sol-gel methodology and gold was supported onto these using a deposition-precipitation method. They were then investigated as catalysts for the low-temperature water-gas shift reaction. Au/Ce0.2Ti0.8O2 exhibited superior activity and stability to a highly active, previously reported gold catalyst supported on ceria-zirconia. High activity and stability was found to be related to the support comprising a high number of oxygen defect sites and a high specific surface area. These properties were conducive to forming a highly active catalyst with well-dispersed Au species.

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KW - Ceria-zirconia

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