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Water Gas Shift Reaction over Pt-CeO2 Nanoparticles Confined within Mesoporous SBA-16

Carta, Daniela, Montini, T., Casula, M.F., Monai, M., Bullita, S., Fornasiero, P. and Corrias, A. (2017) Water Gas Shift Reaction over Pt-CeO2 Nanoparticles Confined within Mesoporous SBA-16 Journal of Materials Chemistry A.

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Abstract

Novel nanocomposite catalysts for single step Water Gas Shift Reaction (WGSR) were prepared by deposition-precipitation and impregnation of Pt-CeO2 nanophases onto an ordered mesoporous silica support featuring a cubic arrangement of mesopores (SBA-16 type). The highly interconnected porosity of the SBA-16 developing in three-dimension (3D) provides a scaffold which is easily accessible to reactants and products by diffusion. The textural and morphological properties of the final catalyst were affected by the procedure utilized for dispersion of the nanophases onto SBA-16. Catalysts prepared by deposition-precipitation present highly dispersed nanocrystalline CeO2 on the surface of SBA-16 and retain high surface area, high thermal stability and high Pt accessibility. Catalysts prepared by impregnation show improved Pt-CeO2 interaction but a more significant decrease of surface area compared to pure SBA-16, due to the confinement of the CeO2 crystallites within the mesoporous matrix. As a result, catalysts prepared by deposition-precipitation are effective for WGSR under working conditions in the high temperature range (around 300-350 °C), whereas catalysts prepared by impregnation are suitable for the process operative at low temperature (LT-WGSR). Our results point out that catalyst preparation procedures can be used to optimise the performance of heterogenous catalysts, by controlling the CeO2 crystallites size and optimizing Pt-CeO2 contact by embedding. Improved thermal and chemical stability was achieved using a mesoporous scaffold.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Carta, Danielad.carta@surrey.ac.ukUNSPECIFIED
Montini, T.UNSPECIFIEDUNSPECIFIED
Casula, M.F.UNSPECIFIEDUNSPECIFIED
Monai, M.UNSPECIFIEDUNSPECIFIED
Bullita, S.UNSPECIFIEDUNSPECIFIED
Fornasiero, P.UNSPECIFIEDUNSPECIFIED
Corrias, A.UNSPECIFIEDUNSPECIFIED
Date : 2017
Copyright Disclaimer : © The Royal Society of Chemistry 2017
Uncontrolled Keywords : Mesoporous silicas; Nanoparticles; Ceria; Platinum; Catalysis
Depositing User : Clive Harris
Date Deposited : 25 Aug 2017 10:26
Last Modified : 25 Aug 2017 10:26
URI: http://epubs.surrey.ac.uk/id/eprint/842040

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