Activity of carbonaceous deposits in the selective reduction of nitrogen oxides

Abstract

Carbonaceous deposits, formed on the catalyst Cu/ZSM-5 by interaction at low temperature with propene, NO and oxygen, are characterised spectroscopically and shown to be able to carry out the selective catalytic reduction of NO; rates of reaction, which follow simple kinetics, are lower than in the absence of pre-deposited coke, and the results suggest an inverse correlation between catalyst Brønsted acidity and activity in NO _x reduction.