| abstract |
Disclosed is a purification catalyst which comprises a catalyst powder comprising a transition metal oxide, wherein the transition metal oxide has an average particle diameter of 1 nm to 2 μm, and wherein the binding energy of an electron of oxygen contained in the transition metal oxide shifts to the lower energy side having an energy lower than 531.3 eV. The purification catalyst can exhibit excellent purifying properties even when a noble metal is not contained in the catalyst as an essential component. |