Reactivity Analysis and Modeling of Cu-SCR Based on NH₃-SCR Mechanism Considering Cu Redox

Abstract

In this study, NOx purification characteristics of Cu-zeolite catalyst were analyzed based on the NH₃-SCR reaction mechanism considering Cu redox. Adsorbed NH₃ showed different reactivity with NOx depending on the type of adsorption site and gas compositions. Reactivity of adsorbed NH₃ on Cu sites had changed by the presence of oxidative gas component, and it was shown that NOx was also purified at reaction sites derived from zeolite. We proposed reaction schemes considering these effects and developed the SCR/DPF model incorporating these schemes.