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

Carta, D., Montini, T., Casula, M. F., Monai, M., Bullita, S., Fornasiero, P., Corrias, A. (2017) Water Gas Shift Reaction over Pt-CeO2 Nanoparticles Confined within Mesoporous SBA-16. Journal of Materials Chemistry A, 5 (37). pp. 20024-20034. ISSN 2050-7488. E-ISSN 2050-7496. (doi:10.1039/C7TA03640J) (KAR id:62937)

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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
DOI/Identification number: 10.1039/C7TA03640J
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Anna Corrias
Date Deposited: 24 Aug 2017 13:39 UTC
Last Modified: 23 Jan 2020 04:13 UTC
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