Studies on the steam CO 2 reforming of methane over ordered mesoporous nickel–magnesium–alumina catalysts
Research on Chemical Intermediates(2017)
摘要
Ordered mesoporous materials have received much attention because of their high surface area and ordered pore structure. The Mg-promoted ordered mesoporous nickel–alumina catalysts (M-Mg x NA), which were prepared using the evaporation induced self-assembly method, were investigated in the Steam CO 2 Reforming (SCR) of methane. The fresh and spent catalysts were characterized by various analytical techniques such as N 2 physisorption, small-angle X-ray scattering, X-ray diffraction, temperature-programmed reduction, thermogravimetric analysis, transmission electron microscopy and CO 2 -temperature programmed desorption analysis. We have found that the M-Mg x NA catalyst has a larger surface area and a narrower pore size distribution than the Ni/Al 2 O 3 catalyst (NA); furthermore, the M-Mg x NA catalyst exhibits high catalytic stability under the tested conditions of 600 °C, 1 bar and feed molar ratio of CH 4 :CO 2 :H 2 O = 1:1:1. We consider that the ordered mesoporosity prevents the nickel particles from sintering because of the confinement effect and decreases the particle size in the SCR reaction. Thus, the Mg-promoted ordered mesoporous nickel-alumina catalyst shows enhanced resistance to carbon formation during the steam CO 2 reforming of methane.
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关键词
Hydrogen, Steam CO2 reforming of methane, Synthesis gas, Ni support catalysts, Mesoporous material, Gas to liquid
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