Mechanism of N2O decomposition over a Rh black catalyst studied by a tracer method. The reaction of N2O with 18O(a)

Shin ichi Tanaka, Koichi Yuzaki, Shin ichi Ito, Hiroshi Uetsuka, Satoshi Kameoka, Kimio Kunimori

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

N2O decomposition on an unsupported Rh catalyst has been studied using tracer technique in order to reveal the reaction mechanism. N216O was pulsed onto 18O/oxidized Rh catalyst at 220 °C and desorbed O2 molecules (m/e = 32, 34, 36) were monitored by means of mass spectrometer. The 18O fraction in the desorbed dioxygen was the same value as that on the surface oxygen. The result shows that the O2 molecules desorb via Langmuir-Hinshelwood mechanism, i.e., the desorption of dioxygen through the recombination of adsorbed oxygen. On the other hand, TPD measurements in He showed that desorption of oxygen from the Rh black catalyst occurred at the higher temperatures. Therefore, reaction-assisted desorption of oxygen during N2O decomposition reaction at the low temperature was proposed.

Original languageEnglish
Pages (from-to)413-418
Number of pages6
JournalCatalysis Today
Volume63
Issue number2-4
DOIs
Publication statusPublished - 2000 Dec 25
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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