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Methane partial oxidation over NiO-MgO/Ce0.75Zr0.25O2 catalysts 被引量:2
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作者 piyawat pue-on Vissanu MEEYOO Thirasak RIRKSOMBOOON 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2013年第3期289-296,共8页
Methane partial oxidation (MPO) is considered as an alternative method to produce hydrogen because it is an exothermic reaction to afford a suitable H2/CO ratio of 2. However, carbon deposition on a catalyst is obse... Methane partial oxidation (MPO) is considered as an alternative method to produce hydrogen because it is an exothermic reaction to afford a suitable H2/CO ratio of 2. However, carbon deposition on a catalyst is observed as a major cause of catalyst deactivation in MPO. In order to find suitable catalysts that prevent the carbon deposition, NiO-MgO/Ce0.75Zr0.2502 (CZO) supported catalysts were prepared via the co-impregnation (C) and sequential incipient wetness impregnation (S) methods. The amount of Ni loading was fixed at 15 wt-% whereas the amount of MgO loading was varied from 5 to 15 wt-%. The results revealed that the addition of MgO shifted the light-off temperatures to higher temperatures. This is because the Ni surface was partially covered with MgO, and the strong interaction between NiO and NiMgO2 over CZO support led to the difficulty in reducing NiO to active Ni~ and thus less catalytic activity. However, among the catalysts tested, the 15Ni5Mg/CZO (S) catalyst exhibited the best catalytic stability for MPO after 18 h on stream at 750℃. Moreover, this catalyst had a better resistance to carbon deposition due to its high metallic Ni dispersion at high temperature. 展开更多
关键词 methane partial nia MGO mixed oxide solid oxidation NIO ceria-zircosolution
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