Significant efforts have been devoted to the H2 production by the steam reforming of methane (SRM) using metal nanoparticles (NPs) catalysts. Many researchers have reported that the miniaturization of the NPs size could improve the H2 production activity. It was also reported that the photo-assisted deposition (PAD) method can achieve preparing smaller size NPs compared with the conventional impregnation (IMP) method. However, the SRM using metal NPs catalyst prepared by the PAD method has been hardly reported. In this study, the composite oxide of TiO2 and SiO2 was selected as a support to prepare metal NPs by the PAD method. The Pt NPs photocatalytically supported on TiO2 dispersed on SiO2 were used for the SRM, and the effect of Pt particle size was investigated. The SRM was carried out at 973 K for 30 min using a fixed-bed flow reactor. The Pt NPs on the composite oxide support exhibiting Ti/(Ti+Si)(mol ratio) of 0.1 exhibited higher CH4 conversion (61.8 %) and H2 yield (52.1 %) compared with those on composite supports of other composition ratio. The Pt NPs supported composite oxide catalyst prepared by the PAD method exhibited ca. 2.8 times CH4 conversion and ca. 2.2 times H2 yield compared with that prepared by the IMP method. In order to confirm the Pt particle sizes prepared by the PAD and the IMP method, the average particle sizes were calculated by the TEM observation. The Pt NPs of ca. 6.0 nm were observed on the composite catalyst prepared by the PAD method whereas those prepared by the IMP method were ca. 42 nm. The Pt NPs were still small size (ca. 14 nm) even after the SRM. It suggests that the PAD method is promising the design method of the Pt metal NPs for the efficient H2 production by the SRM.

Steam reforming of methane with Pt nanoparticles supported on composite oxide of TiO2 and SiO2 prepared by photo-assisted deposition method

254th National Meeting (2017)

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