| abstract |
The present teaching rekates to providing a NOx decomposition agent having an excellent NOx decomposition rate. The NOx decomposition agent containing a perovskite oxide represented by ABx-1MxO 3 , wherein A represents one or more elements selected from the group consisting of La, Sr, Mg, Ca and Ba, B represents Mn, M represents a combination of one or more first metal elements selected from the group consisting of Ti, Zr, Hf, Nb, Ta, Cr, Mo, W and Ce, and one or two second metal elements selected from the group consisting of Ca and Mg, and x represents a number greater than or equal to 0 and less than 1. |