Influence of Gas Phase Reactions on DME-SCR over γ-alumina

Abstract

Above 300°C, gas phase reactions occur between dimethyl ether (DME), NO and O 2 generating NO 2 . The influence of these reactions on DME-SCR was studied in a setup that decoupled the occurrence of gas phase reactions from catalyst temperature. NO x conversion decreased at 350°C and increased at 250°C due to less DME available and higher NCO conversion with NO 2 , respectively.