Fe-BEA触媒上のCH_4によるN_2O 選択還元反応 : 表面中間体と反応メカニズム Selective Catalytic Reduction of N_2O with CH_4 over Fe-BEA Catalysts : Reaction Intermediate and Reaction Mechanism

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The selective catalytic reduction (SCR) of N<Sub>2</Sub>O with CH<Sub>4</Sub> in the presence of excess O<Sub>2</Sub> was studied over ion-exchanged Fe-BEA catalyst by the observation of reaction intermediates in order to elucidate the reaction mechanism. From the results of activity tests, SCR of N<Sub>2</Sub>O with CH<Sub>4</Sub> in the presence of excess O<Sub>2</Sub> proceeded at much lower reaction temperature than N<Sub>2</Sub>O decomposition over the Fe-BEA catalyst. The profiles of temperature programmed desorption of O<Sub>2</Sub> after N<Sub>2</Sub>O pretreatment gave a new desorption peak at lower desorption temperatures compared to the case of O<Sub>2</Sub> pretreatment. However, the oxygen species desorbed at the lower temperatures did not react with CH<Sub>4</Sub> in the profiles of temperature programmed reaction. From the structural analysis by means of extended X-ray absorption fine structure, a Fe-Fe bond was observed on the Fe-BEA catalyst after N<Sub>2</Sub>O treatment. This suggests that binuclear species can be formed over the Fe-BEA catalyst. In the <I>in-situ</I> FTIR observation, the methoxy and formate species were observed during the SCR reaction. We measured the reaction rates of these surface species with N<Sub>2</Sub>O and O<Sub>2</Sub>, and this is related to the selective reduction of N<Sub>2</Sub>O with CH<Sub>4</Sub>.

収録刊行物

  • 表面科学 = Journal of The Surface Science Society of Japan

    表面科学 = Journal of The Surface Science Society of Japan 25(8), 505-512, 2004-08-10

    公益社団法人 日本表面科学会

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各種コード

  • NII論文ID(NAID)
    10013444846
  • NII書誌ID(NCID)
    AN00334149
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03885321
  • NDL 記事登録ID
    7063112
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z15-379
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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