CO selective methanation in H₂-rich gas for fuel cell application: Microchannel reactor performance with Ru-based catalysts
2011
Galletti, C. | Specchia, S. | Specchia, V.
The present paper deals with the study on complete removal of CO in H₂-rich gas stream through CO-SMET over Ru-based catalysts supported on γ-Al₂O₃ and CeO₂ carriers. All the catalysts, loaded with 3% Ru, were prepared by a conventional impregnation method and their CO removal performance was determined at the powder level in a fixed bed micro reactor. The 3% Ru–γAl₂O₃ catalyst showed the best performance; consequently, it was deposited on microchannel metal plates reactor. With a catalyst load on the microchannel plates of 5mgcm⁻² the performance was poor as complete CO conversion was not reached and also CO₂ methanation was present. Increasing Ru load to 5%, the performance further worsened, the CO conversion decreased and higher amount of methane was produced. The catalytic activity on microchannel metal plates reactor was improved with the 3% Ru–γAl₂O₃ catalyst by doubling the its load on the surface (10mgcm⁻²): the residual CO concentration decreased to about 100–150ppmv at 310°C, but a large amount of methane was formed also by the CO₂ methanation, thus reducing catalyst selectivity.
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