Synthesis of La1-xSrxCoO3-δ and its catalytic oxidation of NO and its reaction path
The oxidation rate of NO to NO 2 is a critical parameter in the removal of NO x within selective catalytic reduction (SCR) systems. LaCoO 3-δ is a kind of potential catalyst to enhance the oxidation of NO to NO 2 , it may offers an economic and stable alternative to noble metal catalysts, particularly at elevated temperatures. This study aimed to enhance the catalytic efficiency of LaCoO 3-δ through strontium (Sr) doping. La 1-x Sr x CoO 3-δ (with varying x values of 0.1, 0.2, 0.3, 0.4) was synthesized using a sol-gel method. La 1-x Sr x CoO 3-δ exhibited superior NO oxidation catalytic activity compared to LaCoO 3-δ , with the most notable enhancement observed at x = 0.3 (84 % conversion). This improvement can be attributed to the substitution of La 3+ with Sr 2+ , which induces lattice distortion and charge imbalance, thereby creating more oxygen vacancies that enhance the catalytic oxidation capability of La 1-x Sr x CoO 3-δ . However, it's important to note that an excessive amount of Sr can result in the formation of SrCO 3 deposits on the surface of La 1-x Sr x CoO 3-δ , thereby diminishing its catalytic oxidation performance. The catalytic oxidation reaction behavior adhered most closely to the O 2 -adsorbed E-R model, the surface defects in La 1-x Sr x CoO 3-δ playing a pivotal role in the catalytic reaction.
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