• transition metal doped cryptomelane-type manganese oxide for low-temperature catalytic combustion of dimethyl ether

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 542
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the catalysts of transition metals (fe, co, ni, cu, cr) doped cryptomelane-type manganese oxide (m-oms-2) were prepared and investigated for the catalytic combustion of dimethyl ether (dme). the catalysts were characterized by xrd, ft-ir, bet, tem, icp-aes, xps and h2-tpr techniques. the effects of surface area, the average oxidation state, and the redox properties on catalytic activities were studied. the results showed that 100% co2 selectivity can be realized over the doped oms-2 catalysts. the m-oms-2 catalysts displayed the nanorod morphology with a 13 nm diameter and the length ranging from 50 to 220 nm. the cu doped oms-2 catalyst exhibited the best activity, achieving the light-off temperature (the temperature acquired for 10% dme conversion, t10) and full-conversion temperature (the temperature acquired for 90% dme conversion, t90) of 171 and 180 °c, respectively. dme catalytic combustion over m- oms-2 catalysts was found to follow a mars–van-krevelen mechanism with the presence of redox between mn4+/mn3+ and mm+/m(m−1)+ (m = fe, co, ni, cu, cr).

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