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The mixed oxides, Nd_ 2-x Sr_xCoO_ 4±λ (0.4≤x≤1.2), with K_2NiF_4 structure were synthesized by the polyglycol gel method. The composition and structure of the catalysts were characterized by means of IR, TPD, TPR, chemical analysis and so on. The catalytic performance for NO reduction was investigated. The results show that the mixed oxides have K_2NiF_4 structure. Other phases are found when x=1.2. The amount of Co 3+ and the lattice oxygen over Nd_ 2-x Sr_xCoO_ 4±λ increase with the increase of x. It is found that the catalytic activity for NO reduction is closely correlated with the concentration of oxygen vacancies and the amount of Co 3+ .
The mixed oxides, Nd_ 2-x Sr_xCoO_ 4 ± λ (0.4≤x≤1.2), with K_2NiF_4 structure were synthesized by the polyglycol gel method. The composition and structure of the catalysts were characterized by means of IR, TPD, TPR, chemical The results show that the mixed oxides have K_2NiF_4 structure. Other phases are found when x = 1.2. The amount of Co 3+ and the lattice oxygen over Nd_ 2-x Sr_xCoO_ 4 ± λ increase with the increase of x. It is found that the catalytic activity for NO reduction is closely correlated with the concentration of oxygen vacancies and the amount of Co 3+.