文摘
The nonselective catalytic reduction (NSCR) reaction and the catalytic oxidation of NH<sub>3sub> to NO (C鈥揙 reaction) simultaneously happened during the selective catalytic reduction (SCR) of NO with NH<sub>3sub> over V<sub>2sub>O<sub>5sub>鈥揥O<sub>3sub>/TiO<sub>2sub>, especially at higher temperatures. There was an excellent linear relationship between the SCR reaction rate and gaseous NO concentration, and the intercept and slope can be used to describe the rate constant of NO reduction through the Langmuir鈥揌inshelwood mechanism and that through the Eley鈥揜ideal mechanism, respectively. However, the NSCR reaction rate was nearly independent of gaseous NO concentration, and the reaction order of the C鈥揙 reaction with respect to gaseous NO concentration was much less than zero. According to the kinetic study, the relationship of the SCR performance (i.e., SCR activity and N<sub>2sub> selectivity) with the key factors (for example V<sub>2sub>O<sub>5sub> content, H<sub>2sub>O effect, and reactant concentration) was built, which can be used to predict the SCR performance.