• catalytic performance of ru nanoparticles supported on different mesoporous silicas for preferential oxidation of co in h2-rich atmosphere

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1119
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    • شماره تماس دبیرخانه رویداد: -
     ru catalysts supported on different mesoporous silicas, mcm-41, mcm-48, sba-15 and kit-6, were applied to the preferential oxidation of co in a h2-rich atmosphere (prox). the properties of mesoporous support and the supported ru catalysts were investigated using n2 physisorption, ftir, tem, co chemisorption, h2-tpr and xps. the performance of ru catalysts in prox highly relates to the ru dispersion, support pore structure, ru reducibility and the interaction between ru and support. ru/kit-6 presents the highest surface activity (tof values), owing to the easiest reducibility of ru. nevertheless, its poor ru dispersion results in a low number of surface active sites, leading to the low co conversion value over ru/kit-6. ru/mcm-41 can achieve full co conversion and the high co2 selectivity in the reaction temperature range of 115–180 °c owing to the high ru dispersion from the strong interaction between ru and mcm-41.

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