Perovskite-Like Mixed Oxides (LaSrMn1− xNi xO4+δ, 0 ≤ x ≤ 1) as Catalyst for Catalytic NO Decomposition: TPD and TPR Studies.

Catalytic NO decomposition on LaSrMn_{1− x}Ni _xO_{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 samples 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 suggests that the best activity is obtained from catalyst with the most matched redox potentials (in this work, the biggest Δ T and Δ E values). The close relationships between activity and Δ T or Δ E indicate that Δ T and Δ E are important parameters of catalyst for NO decomposition. [ABSTRACT FROM AUTHOR]