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Reaction and Surface Characterization Studies of Ru/Al2O3 Catalysts for CO Preferential Oxidation in Reformed Gas

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Abstract

In order to investigate the reasons the activation of a Ru/Al2O3 catalyst by heating in a H2/N2 mixed gas improves the CO preferential oxidation (PROX) activity, the oxidation state of the Ru on the catalyst surface was studied by using ESCA. As the ratio of Ru(0) to total Ru on the surface was increased, the temperature window of the Ru catalyst, where CO was reduced to below 10 ppm, was expanded to the lower temperature side. The activity of CO oxidation by O2 of the Ru catalyst at lower temperatures was improved by increasing the ratio of Ru(0). However, the selectivity for CO oxidation hardly varied with the change in the surface Ru(0) ratio at these low temperatures. It is considered that O2 activation on Ru(0) plays an essential role in CO PROX activity on the Ru catalyst at low temperatures.

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  1. Residential Cogeneration Development Department, Osaka Gas Co., Ltd., 3–4, Hokko Shiratsu 1-chome, Osaka, Japan

    Mitsuaki Echigo & Takeshi Tabata

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  1. Mitsuaki Echigo
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  2. Takeshi Tabata
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Echigo, M., Tabata, T. Reaction and Surface Characterization Studies of Ru/Al2O3 Catalysts for CO Preferential Oxidation in Reformed Gas. Catalysis Letters 98, 37–42 (2004). https://doi.org/10.1007/s10562-004-6445-7

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