Approach to analysis of redox active sites of working metal-ion zeolites.In-situ analysis of Fe-zeolite catalysts in NOx reduction by NH_3,and NO assisted N_2O decomposition

摘要

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-programmed 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_X reduction by NH_3,and N_2O 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.