Role of nascent oxygen transients in N2O decomposition and selective catalytic reduction of N2O

Takeshi Nobukawa, Masanori Yoshida, Satoshi Kameoka, Shin Ichi Ito, Keiichi Tomishige, Kimio Kunimori

研究成果: Conference article査読

33 被引用数 (Scopus)

抄録

Pulsed N2O decomposition on an 18O treated Rh/USY catalyst has been carried out to study the mechanism of O2 desorption using isotopic tracer technique. The results show that O2 desorption proceeds at 220°C via the Langmuir-Hinshelwood (LH) mechanism, although O2-TPD measurement showed that desorption of oxygen in He gas from Rh catalyst occurred at much higher temperatures. Therefore, it was proposed that reaction-assisted desorption of O2 occurs during N2O decomposition. Reaction between N2O and CH4 over an Fe-BEA catalyst was also studied. In the pulse studies, N2O readily reacted with CH4 in the exposure of N2O+CH4 mixture above 200°C. In the O2-TPD studies, a new O2 desorption peak appeared at the lower temperatures (300-600°C) after N 2O treatment. However, CH4 was not reactive with the new O(a) species even at 300°C. In the FT-IR studies, the peak of Fe-OH was not changed in the exposure of CH4 only, but decreased in the exposure of N2O+CH4 mixture, accompanied with the formation of methoxy and formate species. A possible mechanism is discussed in terms of nascent oxygen transients (O*(a)), which may play an important role in the activation/oxidation of CH4 at initial steps.

本文言語English
ページ(範囲)791-796
ページ数6
ジャーナルCatalysis Today
93-95
DOI
出版ステータスPublished - 2004 9 1
外部発表はい
イベントSelections from the Presentations of the 3rd Asia-Pacific Congress - Dalian, China
継続期間: 2003 10 122003 10 12

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)

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