Abstract
Temperature-programmed methanations of CO in both He-diluted and reformate-simulated CO-CO2-H-2 mixtures over a commercially available 0.5% Ru/Al2O3 catalyst have revealed that CO methanation always occurred earlier than that Of CO2 at lower temperatures and the temperature where CO2 started methanating and the corresponding remaining CO decreased with decreasing initial CO content in the feed. This, while confirming the prior methanation of CO over CO2, indicates that the fully selective CO methanation is possible. Thus, a novel method called thermally differential methanation was proposed and a totally 820 h long term, simplified thermally differential methanation was conducted to verify the effectiveness of the method on realizing simultaneously the full selectivity and a satisfactorily deep removal of CO from H-2-rich reformates for PEFC application. (c) 2007 Elsevier B.V. All rights reserved.
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