Oxidation of CH4 and CO2 Reforming of CH4 over Rh/ZrO2 Catalysts with Different Metal Dispersions
Shin-ichi ITO*, Ken NAGASHIMA, Ryo ARAKI, Takayoshi YARIMIZU, Satoshi KAMEOKA and Kimio KUNIMORI
Institute of Materials Science, University of Tsukuba; Tsukuba-shi 305-8573 Japan
Oxidation of CH4 under lean condition (800 ppm) and CO2 reforming of CH4 were carried out using Rh/ZrO2 catalysts with different metal dispersions. It was found that both reactions showed a similar structure-sensitive behavior: The TOF decreased with increasing of Rh dispersion. It is suggested that the rate determining step is dissociative adsorption of CH4 for both reactions, and strong Rh-O bonds in smaller Rh crystallites may lead to a suppression of the dissociative adsorption of CH4 on the Rh surface.
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