Superior catalytic behavior of trace Pt-doped Ni/Mg(Al)O in methane reforming under daily start-up and shut-down operation

Dalin Li, Kazufumi Nishida, Yingying Zhan, Tetsuya Shishido, Yasunori Oumi, Tsuneji Sano, Katsuomi Takehira

Research output: Contribution to journalArticle

32 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)225-236
Number of pages12
JournalApplied Catalysis A: General
Volume350
Issue number2
DOIs
Publication statusPublished - 2008 Nov 30

Keywords

  • CH reforming
  • Daily start-up and shut-down operation
  • Ni/Mg(Al)O catalyst
  • Pt doping
  • Self-activation
  • Self-regeneration

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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