La1-xSrxMO3-δ (M = Co, Mn; x = 0,0.4) catalysts have been fabricated via a strategy of citric acid complexing and hydrothermal treatment. The oxidation of toluene was used as a probe reaction for the evaluation of catalytic performance. The materials were characterized by a number of techniques. We observed that the catalytic activity (evaluated by the temperature required for 80% conversion of tolucne, T 80%) increased in the sequence of LaMnO3.10 (T 80% = 295°C) < LaCoO2.89 (T80% = 246°C) < La0.6Sr0.4MnO3.03 (T 80% = 233°C) < La0.6Sr0.4CoO 2.76 (T80% = 219°C) at toluene/O2 molar ratio = 1/400 and space velocity = 20 000 h-1. Moreover, CO 2 and H2O were the only products for toluene oxidation over the catalysts. It is concluded that factors such as enriched structural defects (oxygen vacancies) and good Mn4+/Mn3+ or Co 3+/Co2+ redox ability are responsible for the excellent catalytic performance of the La1-xSrxMO 3-δ nanomaterials.
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- Chemical Engineering(all)
- Industrial and Manufacturing Engineering