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Study on RuO2/SnO2: Novel and Active Catalysts for CO and CH4 Oxidation

Authors

  • Jing Yu,

    1. Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China), Tel: (+86) 15979149877
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  • Dr. Dan Zhao,

    1. Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China), Tel: (+86) 15979149877
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  • Dr. Xianglan Xu,

    1. Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China), Tel: (+86) 15979149877
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  • Prof. Dr. Xiang Wang,

    Corresponding author
    1. Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China), Tel: (+86) 15979149877
    2. Institute of Applied Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China)
    • Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China), Tel: (+86) 15979149877
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  • Prof. Dr. Ning Zhang

    Corresponding author
    1. Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China), Tel: (+86) 15979149877
    • Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330031 (P. R. China), Tel: (+86) 15979149877
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Abstract

RuO2/SnO2 catalysts with 2, 5 and 10 % Ru loadings were prepared with calcined and uncalcined SnO2 supports by the impregnation method. The catalysts were evaluated for CO and CH4 oxidation and characterised by N2-BET, XRD, hydrogen temperature programmed reduction (H2-TPR), energy-dispersive X-ray spectroscopy scanning electron microscopy (EDS-SEM) and thermogravimetric analysis differential scanning calorimetry (TGA-DSC). Owing to the synergetic effect between RuO2 and SnO2, all RuO2/SnO2 catalysts are found to be much more active than pure SnO2 and RuO2/Al2O3 for both CO and CH4 oxidation. For RuO2 supported on uncalcined SnO2, H2-TPR and TGA-DSC analysis revealed the formation of a new, less active compound between Sn and Ru that consumed active SnO2 and RuO2, and could be detrimental to the synergism between RuO2 and SnO2, and thus the activity of RuO2/SnO2 catalytic system. As a consequence, it is much less active than RuO2 supported on calcined SnO2. RuO2/SnO2 catalysts are also very stable in the presence of water vapour, which gives them potential for application in after-treatment processes.

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