Transient kinetic study on NO decomposition over Cu-ZSM-5 catalysts

摘要

Decomposition of NO was studied on Cu-clinoptilolite and Cu-ZSM-5 zeolites of different Si/Al ratio and copper ion exchange rate. During the first contact at 600 deg C with NO an irreversible oxygen uptake by the catalysts was observed. On the long pulse of the NO concentration in the transient stage carried out under isothermal conditon, overshoots in N_2 and O_2 concentration were observed at the leading and falling edge, respectively. In the TPD experiments after NO adsorption a surface complex formulated as NO_3 is decomposed at about the reaction temperature into equimolar amounts of NO and O_2. The role of the surface complex in the NO decomposition is discussed.