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The key role of nanocasting in gold-based Fe2 O3 nanocasted catalysts for oxygen activation at the metal-support interface

García, Tomás, López, José M., Solsona, Benjamín, Sanchis, Rut, Willock, David J., Davies, Thomas E., Lu, Li, He, Qian, Kiely, Christopher J. and Taylor, Stuart H. 2019. The key role of nanocasting in gold-based Fe2 O3 nanocasted catalysts for oxygen activation at the metal-support interface. ChemCatChem 11 (7) , pp. 1915-1927. 10.1002/cctc.201900210
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Abstract

The total oxidation of propane, a representative Volatile Organic Compound, has been studied using gold-based α-Fe2O3 catalysts. Catalysts consisting of gold nanoparticles confined in nanostructured Fe2O3 prepared by a nanocasting route present the highest catalytic activity for propane total oxidation, and the activity is significantly greater than those of gold-based catalysts where iron oxide supports are prepared by other conventional methods, such as calcination. Detailed characterization and Density-functional theory (DFT) studies have been undertaken in order to explain the enhancement in catalytic properties. The presence of confined gold nanoparticles on the nanocast Fe2O3 facilitates the production of highly reactive oxygen vacancies at the metal-support interface, increasing the catalyst performance. Both the development of a microporous/mesoporous structure in the iron oxide support and the presence of a mixed surface phase of Si and Fe oxides, seem to be key parameters, being both features inherent in the nanocasting process from silica templates. Additionally, the catalytic activity is enhanced due to other positive effects, which are closely related to the nanocasting preparation method: i) a higher contact surface area between partially confined small gold nanoparticles in the internal mesoporosity of the nanostructured support and the metal oxide and; ii) a more reducible support due to the presence of more active surface lattice oxygen.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Publisher: Wiley
ISSN: 1867-3880
Date of First Compliant Deposit: 19 March 2019
Date of Acceptance: 22 February 2019
Last Modified: 31 Jul 2019 22:43
URI: http://orca.cf.ac.uk/id/eprint/120920

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