POTENTIAL REACTION PATHS IN NOX REDUCTION OVER CU ZSM-5/

The reaction of NO with adsorbed acetone oxime has been studied over C u/ZSM-5 employing FTIR and MS. It is found that (NOgas)-N-15 reacts wi th N-14 labelled acetone oxime and/or its hydrolysis product, hydroxyl amine, to form (NNO)-N-14-N-15 and (NN)-N-14-N-15 at 40 degrees C. As acetone oxime is easily formed from alkyl radicals and NO via alkylnit roso compounds, the results indicate possible reaction paths for the S CR of NOx by hydrocarbons over zeolite based catalysts. The isotopic d ata suggest predominant formation of N-N bonds occurs via interaction of gaseous NO with a nitrogen containing adsorbed complex.