Role and importance of oxidized nitrogen oxide adspecies on the mechanism and dynamics of reaction over copper-based catalysts

The formation of nitrate and NO2 adspecies over Cu/MFI and copper-on-alumina catalysts and their role in the mechanism of reaction is discussed on the basis of FTIR results and catalytic tests under unsteady-state conditions. Three specific cases are discussed: (1) redn. of NO by propane/O over Cu/MFI, (2) conversion of NO by NH3/O over copper-on-alumina catalysts and (3) O-promoted redn. of NO in the absence of reductants over Cu/MFI. The formation of nitrate species leads to self-deactivation, but Cu2+-NO2 like adspecies are suggested to be a key intermediate in the redn. of NO to N in all 3 cases. [on SciFinder(R)]