Abstract
A series of strontium–lanthanum oxide mixed manganese nodules were prepared and characterized by X-ray diffraction, nitrogen adsorption–desorption, electrical conductivity, and surface excess oxygen. X-ray diffraction patterns confirm the formation of perovskite-type oxides at low strontium content (x≤ 0.5, in La1−xSrxMO3, whereMdenotes the transition metal present in nodules), whereas at 0.6 ≤x≤ 0.8, La2O3and SrO are detected in addition to the perovskite-type oxides. The catalytic activities for hydrogen peroxide decomposition and carbon monoxide oxidation increase with an increase in Sr substitution for La, attain a maximum atx= 0.4, and then decrease with further increase in Sr. The activities have been correlated with various physicochemical properties.
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