Automotive Exhaust Emissions Control Using the Three-Way Catalyst System. 1. Computer Simulation of the NO-H2-O2 Reaction on Pt/Al2O3 Catalyst

Akira Miyamoto, Bunkei Inoue, Yuichi Murakami

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1 Citation (Scopus)


Using a method of computer simulation, the kinetics of the NO-H2-O2 reaction on Pt/Al2O3 has been studied. Inlet concentrations of NO and H2 were 1000 ppm and 1.08%, respectively. Inlet concentration of O2 (C°o2) was varied in the range 0—1.1%. When C°O2 < 0.4%, exit concentration of NH3 was kept high irrespective of C O2 although NO was almost completely removed. When C°o2 > 0.55%, a considerable amount of NO remained unreacted while the formation of NH3 was small. These data were analyzed by the computer simulation method, and simulated results agreed well with those of the experiments. The calculations have also shown the existence of a “window” where all of the NO, NH3, H2, and O2 can be removed simultaneously. Furthermore, NH3 has been found to play an important role as an intermediate in the reaction, and the H2-O2 reaction has been shown to proceed more readily than the NO-H2 reaction. On the basis of the simulated results, directions for the improvement of Pt/Al2O3 as a catalyst have been suggested. It has been concluded that the computer simulation method is promising for the analysis of a complex reaction system, such as the three-way catalyst system.

Original languageEnglish
Pages (from-to)104-109
Number of pages6
JournalIndustrial and Engineering Chemistry Product Research and Development
Issue number2
Publication statusPublished - 1979 Jun 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Engineering(all)
  • Industrial and Manufacturing Engineering

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