Development of Pt/ASDBC catalyst applicable for hydrogen oxidation in the presence of saturated water vapor at room temperature

室温・飽和水蒸気雰囲気下における水素酸化用Pt/ASDBC触媒の開発

岩井 保則; 佐藤 克美; 山西 敏彦

Iwai, Yasunori; Sato, Katsumi; Yamanishi, Toshihiko

室温・飽和水蒸気雰囲気下で高い水素酸化活性を有する疎水型白金触媒を開発した。アルキルスチレン・ジビニルベンゼン共重合体(ASDBC)上に白金を担持した新しいタイプの白金触媒は容積あたりの必要白金担持量が既存の疎水型白金触媒の半分にまで低減が可能である。室温・飽和水蒸気雰囲気下において10000ppmの水素ガスを用いたPt/ASDBC触媒の水素酸化試験では空塔速度320から3300hの範囲で99%を超える水素酸化活性を確認した。触媒を用いた水素酸化反応の律速段階が細孔拡散であるので、放射線照射技術を用いた触媒内細孔の制御を試みた。その結果、電子線照射したPt/ASDBC触媒の水素酸化活性は未照射に比べ向上することを確認した。

We have developed some hydrophobic Pt catalysts applicable for hydrogen oxidation in the presence of saturated water vapor at room temperature. A new type of hydrophobic catalyst, Pt/ASDBC, has been prepared by depositing platinum on alkyl-styrene diviyl-benzene copolymer (ASDBC). The deposited platinum used to prepare Pt/ASDBC catalyst was 1.0 g/L. The value was approximately half of a commercial Pt/SDBC catalyst. Oxidation tests of the catalysts using 10000 ppm of hydrogen were performed in the presence of saturated water vapor at room temperature. Hydrogen oxidation more than 99% was achieved using Pt/ASDBC catalyst in the range of superficial velocity from 320 to 3300 h. Moreover, radiation technology was applied to extend the pore size of catalyst, since the rate-controlling step of hydrogen oxidation reaction is pore diffusion. Hydrogen oxidation performance has been much improved with Pt/ASDBC catalyst irradiated with electron beams.