The effect of cation nonstoichiometry on the property and NO oxidation to NO2 activity over LaMnO3+d were investigated. XRD, BET, CO-O2 pulse, EPR, TPR and XPS results have shown that the cation nonstoichiometric induces lattice distortion and variation of cation concentration. The enhanced NO oxidation activity over the La0.90-0.95MnO3 (La/Mn mole ratio = 0.9-0.95) perovskites was attributed to the structural changes which were spurred by the nonstoichiometric lanthanum to manganese molar ratio.  For instance, the increase of Mn4+ concentration and the amount of active oxygen, has generally been observed with the decreasing molar ratio of lanthanum to manganese.

Effect of cation nonstoichiometry on LaxMnO3 perovskite for NO oxidation to NO2

243rd National Meeting (2012)

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