Steam Reforming of Ethanol Using Silica-Coated Alumite Catalysts on Aluminum Plates (JIS A1050)

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著者

    • KITAJIMA Teiji
    • Department of Chemical Engineering, Faculty of Engineering, Tokyo University of Agriculture and Technology
    • SAKURAI Makoto
    • Department of Chemical Engineering, Faculty of Engineering, Tokyo University of Agriculture and Technology
    • KAMEYAMA Hideo
    • Department of Chemical Engineering, Faculty of Engineering, Tokyo University of Agriculture and Technology

抄録

With the aim of developing a high performance reactor for proton exchange membrane fuel cell (PEMFC) systems and other applications, steam reforming of ethanol using silica-coated alumite catalysts on aluminum plates (JIS A1050) was performed at atmospheric pressure in a temperature range of 300–600°C. The aluminum material (JIS A1050) was used in a plate type aluminum-clad material which has been used for electrically heatable alumite catalysts having high heat durability. Initial ethanol steam reforming tests performed with either an alumite support (<I>γ</I>-Al<SUB>2</SUB>O<SUB>3</SUB>/Al) or an alumite catalyst (Ni/<I>γ</I>-Al<SUB>2</SUB>O<SUB>3</SUB>/Al) produced ethylene (C<SUB>2</SUB>H<SUB>4</SUB>) as the main byproduct because of the dehydration reaction of ethanol. With the aim of eliminating ethylene formation, a silica coating was applied to anodized aluminum plates (JIS A1050 Al) using a commercially available silica sol with a particle diameter of 22–25 nm. The resulting silica-coated alumite support (silica/Al<SUB>2</SUB>O<SUB>3</SUB>/Al) and silica-coated alumite catalyst (Ni/silica/Al<SUB>2</SUB>O<SUB>3</SUB>/Al) dramatically reduced the formation of ethylene. For example, in the case of the silica-coated alumite catalyst (Ni/silica/Al<SUB>2</SUB>O<SUB>3</SUB>/Al) with a silica-coating time of 20 h, C<SUB>2</SUB>H<SUB>4</SUB> was reduced by 100% at 450°C and by 59% at 500°C compared with the levels seen for the alumite catalyst (Ni/<I>γ</I>-Al<SUB>2</SUB>O<SUB>3</SUB>/Al). A silica-coating time of 20 h was found to be the best for reducing ethylene formation. A temperature programmed desorption analysis with ammonia desorption also showed that the number of acidic sites per apparent surface area of the silica-coated alumite support (silica/Al<SUB>2</SUB>O<SUB>3</SUB>/Al) and the silica-coated alumite catalyst (Ni/silica/Al<SUB>2</SUB>O<SUB>3</SUB>/Al) was smaller than that of the alumite support (<I>γ</I>-Al<SUB>2</SUB>O<SUB>3</SUB>/Al) and the alumite catalyst (Ni/<I>γ</I>-Al<SUB>2</SUB>O<SUB>3</SUB>/Al) without any silica coating, respectively. These results suggest that the low level of ethylene formation with the silica-coated alumite support and silica-coated alumite catalyst was due to the smaller number of acidic sites. It is concluded that the silica-coating method is preferable for improving the properties of alumite supports and alumite catalysts for use in ethanol steam reforming.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 39(8), 876-888, 2006-08-01 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10018206240
  • 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
    8018123
  • 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  CJP引用  NDL  J-STAGE 
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