Reactivity Analysis and Modeling of NH3-SCR Reaction at High Temperatures Considering Reactions on Cu Active Sites and Brønsted Acid Sites in a Cu-chabazite SCR Catalyst

Abstract

In this study, the NH₃ oxidation reactivity of a Cu-chabazite SCR catalyst, which has a large impact on NOx purification characteristic at higher temperatures, was investigated using a synthetic gas bench. Detailed analyses by in-situ XAFS and DRIFTS were also performed to clarify the difference in reactions on Cu sites and Brønsted acid sites. Moreover we have developed a SCR reaction model considering the difference in reactions on these sites and showed this model can express the NOx purification phenomena at the high temperature range correctly.