Perovskite-Like Mixed Oxides (LaSrMn_(1-x)Ni_xO_(4+δ), 0≤ x≤1) as Catalyst for Catalytic NO Decomposition: TPD and TPR Studies

摘要

Catalytic NO decomposition on LaSrMn_(1-x)Ni_x O(4+δ ) (0≤ x≤1) is investigated. The activity of NO decomposition increases dramatically after the substitution of Ni for Mn, but decreases when Mn is completely replaced by Ni (x = 1.0). The optimum value is at x = 0.8. These indicate that the catalytic performance of the sam ples is contributed by the synergistic effect of Mn and Ni. O2-TPD and H2-TPR experiments are carried out to explain the change of activity. The former indicates that only when oxygen vacancy is created, could the catalyst show enhanced activity for NO decomposition; the latter sug gests that the best activity is obtained from catalyst with the most matched redox potentials (in this work, the big gest △T and AE values). The close relationships between activity and △T or △E indicate that △T and △E are important parameters of catalyst for NO decomposition.