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Synthesis of Pt–OMG mesoporous composite via nanocasting and chemical vapor infiltration

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Abstract

When supported by suitable metal oxides such as ceria, platinum often displays increased catalytic activity and selectivity. A chemical vapor infiltration technique was used to impregnate Pt nanoparticles into an ordered mesoporous gadolinium-doped ceria (OMG), which was templated from KIT-6 silica. High Pt loading, up to 38 vol% of OMG, was achieved. This synthesis method is highly scalable and offers easy control over catalyst–support geometry. A detailed study of the OMG structure was conducted by controlling the synthesis parameters of the KIT-6 silica template. Formation mechanism and thermal stability of the OMG/Pt–OMG composite were also studied. The mesostructure composites were found to sustain until 750 and 650 °C, respectively. The highly structural composite holds the promise of increased activity, selectivity, and stability for applications in heterogeneous catalysis.

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Acknowledgments

This work was supported by the Hong Kong RGC (Grant No. GRF HKU 700209P) and the HKU Development Fund for the Initiative of Clean Energy and Environment. We thank Mr. F.Y.F. Chan, Electron Microscope Unit of University of Hong Kong, and T. K. Cheung of MCPF of HKUST for their professional assistance in electron microscopy.

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  1. Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong

    Hoi Yung, Kwong-Yu Chan & Frank Leung-Yuk Lam

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  1. Hoi Yung
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  2. Kwong-Yu Chan
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Correspondence to Hoi Yung.

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Yung, H., Chan, KY. & Leung-Yuk Lam, F. Synthesis of Pt–OMG mesoporous composite via nanocasting and chemical vapor infiltration. Journal of Materials Research 28, 863–872 (2013). https://doi.org/10.1557/jmr.2012.411

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