Study On Carbon Monoxide Conversion Copper-cerium Catalyst In Environmental Exhaust Gas

With the development of industry and society,China’s total fossil energy consumption has approached the summit.The use of large amounts of fossil fuels not only leads to large amounts of carbon dioxide emissions,but also with different concentrations of CO emissions.Among them,the CO emissions at lower concentrations are large and difficult to be trapped.In this paper,we explored the key catalytic materials for CO catalytic oxidation to CO₂.There are many catalysts for CO catalytic oxidation.The active components of CO catalytic oxidation catalysts with excellent low temperature performance are mainly VIII group noble metals.However,the noble metals are expensive and not suitable for large-scale commercial applications.In recent years,a large number of studies have been carried out on the CO catalytic oxidation over non-noble metals at low temperature,among which the Cu-Ce system shows good catalytic CO oxidation performance.In this paper,Cu-Ce system was selected to study the catalytic performance of CO oxidation,and the obtained results are as follows:（1）A series of CuCeSi catalysts with different Cu:Ce atomic ratio supported on Si O₂ were prepared and investigated.It was found that CuCeSi catalyst with Cu:Ce atomic ratio of 15:85 had good activity for CO oxidation at low temperature,and CO could be completely oxidized at 130°C.（2）Based on the optimized Cu:Ce atomic ratio,a series of CuCeSi catalysts with different loadings were studied.The evaluation data showed that the CuCeSi catalyst with 27 wt%loading had the best catalytic activity for CO oxidation at low temperature,and CO could be completely oxidized at 120°C.（3）The catalytic oxidation of CO requires the catalyst to provide reactive oxygen species,and the materials with high oxygen carrying capacity are expected to promote the oxidation of CO.A series of CuCe catalysts prepared by different methods were investigated.The evaluation results showed that the CO full oxidation temperature of RP-45 catalyst with Cu:Ce ratio of 45:55 was as low as 100°C.According to the characterization,the optimal Cu-O-Ce structure can be produced when the number of Cu and Ce atoms is close for the CuCe series catalysts.TPR shows that the reduction temperature of Cu O is significantly reduced,indicating that the Cu-O bond is greatly weakened.At the same time,highly dispersed Ce O₂ is conducive to providing active oxygen centers,thus promoting the low-temperature CO reduction performance of catalysts with a large number of Cu-O-Ce structures.