Temperature profile of catalyst bed during oxidative steam reforming of methane over Pt-Ni bimetallic catalysts

Baitao Li, Shigeru Kado, Yuya Mukainakano, Mohammad Nurunnabi, Toshihiro Miyao, Shuichi Naito, Kimio Kunimori, Keiichi Tomishige

研究成果: Article

71 引用 (Scopus)

抜粋

The catalyst bed temperature during oxidative reforming of methane (CH4/H2O/O2/Ar = 40/30/20/10) at 1123 K and atmospheric pressure was investigated by infrared thermography over γ-Al2O3 supported bimetallic Pt-Ni catalysts prepared by different impregnation methods: co-impregnation and sequential impregnation. The thermographical results clearly demonstrated that the catalyst bed temperature was strongly dependent on the preparation method. The bimetallic catalyst prepared from the sequential impregnation method exhibited much higher resistance to hot spot formation in oxidative reforming of methane. Temperature programmed reduction (TPR) with H2 revealed that the addition of Pt by a sequential impregnation method greatly promoted the reduction of Ni species; furthermore, infrared spectra of CO adsorption suggests that the surface composition of Pt on the catalyst prepared by the sequential method is much higher than that for the catalyst prepared by the co-impregnation method. The surface enrichment of Pt is responsible for the effective overlap between the combustion and reforming zones, and this can enhance the inhibition of hot spot formation.

元の言語English
ページ(範囲)62-71
ページ数10
ジャーナルApplied Catalysis A: General
304
発行部数1-2
DOI
出版物ステータスPublished - 2006 5 10
外部発表Yes

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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