• a facile approach for the preparation of biomorphic cuo–zro2 catalyst for catalytic combustion of methane

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 977
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     a series of novel biomorphic cuo–zro2 catalysts were prepared using a cotton bio-template and compared with conventional cuo–zro2 catalysts. the physical and chemical properties of the as-obtained catalysts were characterized by techniques including x-ray diffraction (xrd), scanning electron microscope (sem), transmission electron microscope (tem), h2-temperature programmed reduction (h2-tpr), and o2-temperature programmed desorption (o2-tpd). the catalytic combustion of methane was chosen as the probe reaction. the results suggested that the bio-template method prepared porous biomorphic cuo–zro2catalysts consist of hollow microtubes. comparing with conventional cuo–zro2 catalysts, biomorphic cuo–zro2 catalysts displayed better reducibility and oxygen mobility, stronger metal-oxides synergistic effect, appropriate particle size distribution, and lower activation energy. the crystalline state of zirconia transformed from a single crystallite phase of t-zro2 into a complex of m-zro2 and t-zro2 after introducing the bio-template. with proper cuo content (20 mol%), the biomorphic cuo–zro2 catalyst displayed preponderant properties. the compensation of surface lattice oxygen from bulk lattice oxygen was more available at high reaction temperatures.

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