To enhance the activity of catalysts for CO removal, the perovskite-type catalysts La_1-xSr_xCoO₃ (x = 0, 0.2, 0.4, 0.6, and 0.8) with different Sr²⁺ doping amount were synthesized by flame spray synthesis (FSS) method. The perovskite-type catalyst synthesized by FSS has a much larger specific surface area (SSA) than that prepared by other conventional methods. The SSA of catalyst increases with the increase of Sr²⁺ doping amount and the SSA of La_0.2Sr_0.8CoO₃ reaches 31.65 m²/g. Compared with other conventional methods, FSS method significantly improves the activity of catalyst and makes it close to the performances of catalysts with surface modification. The substitution of La³⁺ by Sr²⁺ promotes the generation of secondary phase Co₃O₄ and SrCO₃. The catalytic activity of La_1-xSr_xCoO₃ increases with the addition of Sr²⁺, which results from the increasing active sites and oxygen vacancies. Interestingly, La_0.4Sr_0.6CoO₃ performs the highest activity for CO oxidation and the CO conversion reaches 50% at 148.6 °C and 90% at 165.9 °C. The oxidation of CO over La_1-xSr_xCoO₃ catalyst may follow a combination of MvK and L-H mechanisms according to the experimental results of H₂-TPR. Moreover, the catalyst exhibits good catalytic activity in consecutive oxidation cycles. In consecutive oxidation experiments with La_0.4Sr_0.6CoO₃, the CO conversion reaches 50% at 168.8 °C and 90% at 197.8 °C in the eighth oxidation cycle. These results prove that FSS method can further improve the activity of catalysts and is suitable for the preparation of efficient catalysts.

为了提高除CO催化剂的活性，采用火焰喷涂法合成了掺杂量不同的Sr ²⁺的钙钛矿型催化剂La _1-x Sr _x CoO ₃（x = 0、0.2、0.4、0.6和0.8）。（FSS）方法。由FSS合成的钙钛矿型催化剂比通过其他常规方法制备的钙钛矿型催化剂具有大得多的比表面积（SSA）。催化剂的SSA随Sr ²⁺掺杂量的增加而增加，La _0.2 Sr _0.8 CoO ₃的SSA达到31.65 m ²/G。与其他常规方法相比，FSS方法显着提高了催化剂的活性，使其接近表面改性的催化剂性能。La ³⁺被Sr ²⁺取代促进了第二相Co ₃ O ₄和SrCO _3的生成。La _1-x Sr _x CoO ₃的催化活性随Sr ²⁺的添加而增加，这是由于活性位点和氧空位的增加所致。有趣的是La _0.4 Sr _0.6 CoO ₃CO的氧化活性最高，在148.6°C时CO转化率达到50％，在165.9°C时CO转化率达到90％。根据H ₂ -TPR的实验结果，La _1-x Sr _x CoO ₃催化剂上的CO氧化可以遵循MvK和LH机理的结合。此外，该催化剂在连续的氧化循环中表现出良好的催化活性。在使用La _0.4 Sr _0.6 CoO _3的连续氧化实验中，在第八个氧化循环中，CO转化率在168.8°C时达到50％，在197.8°C时达到90％。这些结果证明，FSS方法可以进一步提高催化剂的活性，适用于制备高效催化剂。