The Role of Support in Methane Reforming with CO2 over Rhodium Catalysts

Junji Nakamura, Keita Aikawa, Koichi Sato, Toshio Uchijima

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)

抄録

The catalytic activity of Rh/SiO2 for reforming of CH4 with CO2 was promoted by mixing physically with Al2O3, MgO, TiO2, K/SiO2. The order in Pco2 and Pch4 for CH4 + CO2 reaction over Rh/SiO2 were unity and - 0.6, respectively, indicating that CO2 dissociation was the rate-limiting step which was promoted by the mixing of metal oxides. In-situ FT-IR studies showed that dominant species formed by exposing Rh/SiO2 + Al2O3 to CO2 + H2 was formate at high temperatures above 400 K. The promotion in the activity of Rh/SiO2 by mixing with the metal oxides is ascribed to the rise of CO2 concentration in the vicinity of Rh particles, where CO2 is trapped as carbonate and/or formate on the surface of the metal oxides. The basic property of metal oxide surface may be responsible for the activity of CO2 dissociation.

本文言語英語
ページ(範囲)495-500
ページ数6
ジャーナルStudies in Surface Science and Catalysis
90
C
DOI
出版ステータス出版済み - 1月 1 1994
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 触媒
  • 凝縮系物理学
  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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