The rate of NO-NH3 reaction on V2O5/TiO2 or V2O5/AI2O3 catalyst under dilute gas condition was markedly increased by the addition of O2 to 0.7%, and it was almost constant above this concentration. From the data of steady-state catalyst structures at various concentrations of 02 observed by using IR and ESR spectroscopy, the surface V5+=0 species was found to be the active oxygen species. The reaction rate under excess oxygen condition was measured for catalysts with various contents of V2O5 at 160-300°C. When the content of V2O5 was low (1, 2, or 5 mol %), V2O5/AI2O3 showed negligible activity for the reaction, while V2O5/TiO2 exhibited high activity. On the other hand, when the content of V2O5 was high (25 or 50 mol %), V2O5/AI2O3 showed higher activity than V2O5/TiO2. In spite of the significant difference in the rate of the reaction between V2O5/TiO2 and V2O5/AI2O3, the rate was proportional to the number of surface V=0 bonds on the catalyst for all catalysts employed at any temperature between 160 and 300°C. This indicates a constant activity of the surface V=0 bond for the NO-NH3 reaction.
|Number of pages||5|
|Journal||Industrial and Engineering Chemistry Product Research and Development|
|Publication status||Published - 1982 Sep 1|
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering