Approach to analysis of redox active sites of working metal-ion zeolites.: In-situ analysis of Fe-zeolite catalysts in NOx reduction by NH3, and NO assisted N2O decomposition

A description is given of recent progress in identification of the structure of active sites of a working metal-zeolite catalyst based on combination of targeted preparation of metal-zeolite material and the in situ approach of time-resolved concentration-programined FTIR analysis (CPR-FTIR). Emphasis is placed on providing a detail description of the working Fe-zeolite catalysts under real reaction conditions of the NO., reduction by NH3, and N2O decomposition. The state of the iron zeolites is also characterized using a variety of methods, including TPD, TPR, isotopic exchange as well as Mossbauer, EPR, UV-VIS, and FTIR spectroscopies.