• partial oxidation of methane to syngas on bulk nial2o4 catalyst. comparison with alumina supported nickel, platinum and rhodium catalysts

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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    in this work the catalytic performance of nial2o4 catalyst in the partial oxidation of methane (ch4(1)/o2(0.5)/n2(8.5) and 4800 ml ch4 g−1 h−1) was investigated. this bulk catalyst resulted more active (70% conversion at 625 °c) than alumina supported nickel catalysts prepared by conventional impregnation (11%ni/al2o3-30% conversion at 625 °c and 14%ni/al2o3-65% conversion at 625 °c) and a commercial platinum catalyst (1%pt/al2o3-30% conversion at 625 °c). further, the behaviour of nial2o4 was comparable to that of a commercial rhodium catalyst (1%rh/al2o3-75% conversion at 625 °c). fresh and spent catalysts were characterised by n2-physisorption, h2-tpr, uv-vis-drs, wdxrf, xrd, tga-ms, tem and raman spectroscopy. after catalyst reduction ch4 conversion over bulk nial2o4 was associated with the formation of large amounts of metallic nickel crystallites with a relatively small size. although significant coking was noticed, conversion and selectivity to h2/co were not significantly affected after prolonged time on stream.

     

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