CH4 decomposition with a Pd-Ag hydrogen-permeating membrane reactor for hydrogen production at decreased temperature

Tatsumi Ishihara, Akihiro Kawahara, Akira Fukunaga, Hiroyasu Nishiguchi, Hidetoshi Shinkai, Masahiro Miyaki, Yusaku Takita

研究成果: ジャーナルへの寄稿学術誌査読

20 被引用数 (Scopus)

抄録

The decomposition of CH4 into C and H2 over Ni/SiO2 was investigated with a Pd-Ag hydrogen-permeating membrane reactor. The CH4 decomposition reaction hardly proceeded at temperatures lower than 773 K in a conventional fixed-bed reactor because of a chemical equilibrium limit. However, the conversion of CH4 was dramatically increased by removing the formed hydrogen by the Pd-Ag membrane. Because higher CH4 decomposition conversions were achieved at higher hydrogen removal rates in the Pd-Ag membrane, the removal of the formed hydrogen seems to be the key step for CH4 decomposition reaction at decreased temperature. Because a higher hydrogen permeation rate was achieved on the Pd(77)-Ag(23) membrane than on the Pd(90)-Ag(10) membrane, the CH4 conversion was always higher in membrane reactors using Pd(77)-Ag(23) than in reactors using Pd(90)-Ag(10) for the hydrogen separation membrane. The CH4 conversion increased with increasing contact time of the reactant and/or with increasing sweep Ar flow rate, because the hydrogen removal rate was improved. Consequently, this study revealed that CH4 decomposition into CO and H2 can occur with sufficiently high conversion (gt;88%) at 773 K and this process can provide hydrogen at decreased temperature.

本文言語英語
ページ(範囲)3365-3369
ページ数5
ジャーナルIndustrial and Engineering Chemistry Research
41
14
出版ステータス出版済み - 7月 10 2002
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)
  • 産業および生産工学

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