Effects of cerium precursors on surface properties of mesoporous CeMnOx catalysts for toluene combustion

Mesoporous CeMnOx composite oxides catalysts were prepared by surfactant-assisted co-precipitation method and used for the catalytic oxidation of toluene. The effect of different cerium precursors [Ce(NO3)(3) and (NH4)(2)Ce(NO3)(6)] on catalyst structure, surface properties and toluene combustion activities of mesoporous CeMnOx catalysts were investigated. The Ce(III)MnOx catalyst prepared from Ce(NO3)(3) precursor shows higher catalytic activity, with a 90% conversion temperature of 240 degrees C, which is better than the Ce(IV)MnOx catalyst derived from (NH4)(2)Ce(NO3)(6)] precursor. On the basis of characterizations, it reveals that abundant surface content of Mn4+, better redox behavior and larger concentration of surface active oxygen species are responsible for the excellent catalytic performance. (C) 2019 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.