Effect of KCl on selective catalytic reduction of NO with NH3 over a V2O5/AC catalyst

Abstract

Abstract Deactivation of a low temperature selective catalytic reduction (SCR) catalyst, 1 wt% V 2 O 5 /AC, by potassium chloride (KCl) is studied using BET and pore size distribution measurements, NH 3 sorption and temperature-programmed desorption (TPD), temperature-programmed surface reaction (TPSR). Results show that KCl deactivates 1 wt%V 2 O 5 /AC’s SCR activity and the deactivation become severer at higher KCl loadings. The deactivation is not caused by pore plugging but by neutralization of acid sites on V 2 O 5 /AC. Weak acid sites are responsible for NH 3 activation and SCR of NO, and are preferentially deactivated by KCl.