| abstract |
Provided are a layered complex oxide that can lower PM oxidation temperature and increase oxidation rate, and a nitrogen oxides reduction catalyst, a three-way catalyst, a DPF and an oxidation catalyst, each of which includes the layered complex oxide. The layered complex oxide has a layered perovskite structure and has a composition represented by the formula: (Ln 3-x A x ) 1-α Mn 2 O 7-δ (wherein Ln is La and/or Nd, A is Sr and/or Ca, α is degree of A-site deficiency, δ is the oxygen deficit amount, and X, δ and α satisfy 0<X<3, 0<α<1 and δ<1.4), which are included in the catalysts and DPF. |