| abstract |
(57) [Problem] To provide an exhaust gas purifying catalyst which has excellent heat resistance, has high catalytic activity for decomposition of harmful dioxins and its precursors at high temperatures, and can be used at high temperatures. SOLUTION: Mg, Mn, Nb, Ta and Periodic Table 3 It is characterized by comprising a composite oxide containing at least one selected from group a metals and pentavalent V. In particular, the composite oxide is composed of V 2 O 5 .2MnO, V 2 O 5. 2Mg O, V 2 O 5 · 3MgO , V 2 O 5 · Ln 2 O 3 (Ln is the Periodic Table 3a group element), V 2 O 5 · 9Nb 2 O 5 and V 2 O 5 · It is preferable to include at least one of 9Ta 2 O 5 . |