ie5b03044_si_001.pdf (175 kB)
Global Kinetic Study of NO Reduction by NH3 over V2O5–WO3/TiO2: Relationship between the SCR Performance and the Key Factors
journal contribution
posted on 2015-11-11, 00:00 authored by Shangchao Xiong, Xin Xiao, Yong Liao, Hao Dang, Wenpo Shan, Shijian YangThe
nonselective catalytic reduction (NSCR) reaction and the catalytic
oxidation of NH3 to NO (C–O reaction) simultaneously
happened during the selective catalytic reduction (SCR) of NO with
NH3 over V2O5–WO3/TiO2, 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–Hinshelwood
mechanism and that through the Eley–Rideal mechanism, respectively.
However, the NSCR reaction rate was nearly independent of gaseous
NO concentration, and the reaction order of the C–O 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 N2 selectivity) with the key factors
(for example V2O5 content, H2O effect,
and reactant concentration) was built, which can be used to predict
the SCR performance.