Hydrogen Production by Steam Reforming of Methanol

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Steam reforming of methanol, CH<SUB>3</SUB>OH + H<SUB>2</SUB>O → 3H<SUB>2</SUB> + CO<SUB>2</SUB>, was carried out over Cu/ZnO and various supported group 8–10 metal catalysts. Over Cu/ZnO catalysts prepared by a coprecipitation method, the steam reforming of methanol occurs with high selectivity regardless of composition of the catalyst and structure of the precursor (aurichalcite, malachite, hydrozincite or their mixture). The Cu/ZnO catalysts prepared from the aurichalcite precursor are more active than those prepared from other precursors.<BR>By contrast, over supported group 8–10 metal catalysts, such as supported Pd, Pt, Co, Ni, Rh, Ir and Ru catalysts, hydrogen and carbon monoxide are predominantly produced by decomposition of methanol, CH<SUB>3</SUB>OH → 2H<SUB>2</SUB> + CO. The selectivity for the steam reforming is lower than those over Cu/ZnO catalysts. However, the selectivity for the steam reforming is markedly improved upon the previous reduction of Pd/ZnO, Pd/Ga<SUB>2</SUB>O<SUB>3</SUB>, and Pd/In<SUB>2</SUB>O<SUB>3</SUB> at higher temperatures. Upon addition of Zn to the supported Pd catalysts, the selectivity for the steam reforming and the rate of hydrogen formation are markedly increased. Over Zn modified Pd/CeO<SUB>2</SUB> catalyst, the selectivity attains to 99.0%, being comparable to Cu/ZnO catalysts. Combined results with temperature programmed reduction, XRD, XPS and AES measurements revealed that PdZn alloy was formed by the previous reduction of Pd/ZnO or Zn modified Pd/CeO<SUB>2</SUB> catalyst. Catalytic functions of Pd are greatly modified upon the formation of PdZn alloys.

収録刊行物

  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 37(2), 286-293, 2004-02-01

    公益社団法人 化学工学会

参考文献:  19件中 1-19件 を表示

各種コード

  • NII論文ID(NAID)
    10013339475
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    6863071
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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