Direct decomposition of NO into N2 and O2 over Ba3Y3.4Sc0.6O9

Kazuya Goto, Tatsumi Ishihara

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11 Citations (Scopus)

Abstract

Effects of dopant on direct decomposition of nitric oxide (NO) over Ba 3Y4O9 were investigated and it was found that Sc is partially substituted Ba3Y3.4Sc0.6O 9 catalyst shows a high NO decomposition activity (N2 yield: 92%) at 1123 K among the examined dopants. Sc is considered to contribute to the stabilization of the Ba3Y4O9 crystal phase and also form the intrinsic oxygen defects. This catalyst was active in NO decomposition in the presence of O2 and maintained its high activity at high space velocity values. Fourier transform infrared spectroscopy (FT-IR) measurement suggests that initial adsorption state of NO is a bent-type NO -. Moreover, the rate-determining step for NO decomposition seems to be the coupling of the NO species adsorbed on the surface. Doping with Sc effectively weakened the adsorption of NO species, resulting in the increased reactivity. FT-IR and temporal analysis of products (TAP) measurements suggested that N2O may be an intermediate species in NO decomposition.

Original languageEnglish
Pages (from-to)66-73
Number of pages8
JournalApplied Catalysis A: General
Volume409-410
DOIs
Publication statusPublished - Dec 15 2011

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

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