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

Junji Nakamura, Keita Aikawa, Koichi Sato, Toshio Uchijima

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)495-500
Number of pages6
JournalStudies in Surface Science and Catalysis
Volume90
Issue numberC
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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