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Superior catalytic behavior of trace Pt-doped Ni/Mg(Al)O in methane reforming under daily start-up and shut-down operation
Authors:Dalin Li   Kazufumi Nishida   Yingying Zhan   Tetsuya Shishido   Yasunori Oumi   Tsuneji Sano  Katsuomi Takehira  
Affiliation:aDepartment of Chemistry and Chemical Engineering, Graduate School of Engineering, Hiroshima University, Kagamiyama 1-4-1, Higashi-Hiroshima 739-8527, Japan;bDepartment of Molecular Engineering, Graduate School of Engineering, Kyoto University, Katsura 1, Nishikyo-ku, Kyoto 615-8510, Japan
Abstract:Doping effects of Pt and Ru on Ni/Mg(Al)O catalysts were compared in daily start-up and shut-down operations of steam reforming of CH4. Trace Pt-doped catalyst showed better behavior than trace Ru-doped catalyst; the former was self-activated but the latter was not, although both exhibited self-regenerative activity. Moreover, the former exhibited sustainable activity, although the latter was quickly passivated, in the autothermal reforming of CH4. Formation of Pt–Ni alloy on the surface of fine Ni metal particles on the catalysts was suggested by EXAFS analyses. CH4 was dissociatively activated to form hydrogen on Pt, assisted by adsorbed O or OH species, leading to the self-activation via Ni reduction by hydrogen spillover from Pt. The self-regeneration of the Pt–Ni/Mg(Al)O catalysts can be achieved by the continuous rebirth of active Ni metal species via reversible reduction–oxidation between Ni0 and Ni2+ in/on Mg(Ni,Al)O periclase assisted by the hydrogen spillover.
Keywords:CH4 reforming   Self-activation   Self-regeneration   Ni/Mg(Al)O catalyst   Pt doping   Daily start-up and shut-down operation
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