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In the steam gasification of biomass, the additive effect of noble metals such as Pt, Pd, Rh and Ru to the Ni/CeO 2 /Al 2 O 3 catalyst was investigated. Among these noble metals, the addition of Pt was most effective even when the loading amount of added Pt was as small as 0.01 wt%. In addition, the catalyst characterization suggests the formation of the Pt-Ni alloy over the Pt/Ni/CeO 2 /Al 2 O 3 .

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The modification of Ni/CeO 2 /Al 2 O 3 with Pt can make the activation by H 2 reduction unnecessary, and this indicates that the Pt/Ni/CeO 2 /Al 2 O 3 catalyst can be activated automatically by the compounds contained in tar. This can be explained by the enhancement of the Ni reducibility by the addition of Pt. The results of the temperature programmed reduction with H 2 also support this enhancement. Furthermore, the addition of 0.1% Pt to Ni/CeO 2 /Al 2 O 3 (4wt% Ni, 30wt% CeO 2) enhanced the performance in the steam gasification of biomass, compared to Ni/Al 2 O 3 and Ni/CeO 2 /Al 2 O 3 in terms of low tar yield and high gas yield. This can be related to the Pt-Ni alloy formation indicated by the extended X-ray absorption fine structure analysis.