Research Of Catalytic Combustion Of Supported Metal Oxide Catalysts For The Treatment Of Waste Gases Containing Aromatics

VOCs pollution causes a variety of environment, economic problems,which have great affects on the lives of mainkind. The catalysts for the catalytic combustion of VOCs have been widely studied.This paper aimed at the study of the catalytic performance of double metal supported catalysts for the catalytic combustion of waste gas containing benzene. The research was mainly about the effect of the interaction between different metals on the catalytic performance. And the characteristics of the catalyst were studied by XRD, H2-TPR, XPS, BET, TPD and other characterization methods. Finally, the life of catalysts was studied.In the study of catalytic combustion of aromatics-containing gas by using Cu as the main metal, adding Mn, Co, Cr, Fe, Ce as the auxiliary metal catalyst, 10% of the total metal loading was the appropriate choice, between Cu and different second metal, the synergistic effect occured, the synergistic effect between Cu and the second metal could form a solid solution similar to Cu-M-O ?M represents a second doped metal?, and when the solid solution could promote the bimetallic multi-stage reduction, the interaction was stronger and more conducive to improve the activity. In a series of Cu-Mn bimetallic supported catalysts, the catalytic performance of Cu-Mn bimetallic supported on ?-Al₂O₃ catalyst was the best.In the study of Cu-Mn supported on ?-Al₂O₃, changing the molar ratio of Cu/Mn, the preparation of the catalyst, and the calcination temperature of the catalyst on the catalyst catalytic combustion of benzene-containing exhaust gas performance were studied. In the experiment, when the molar ratio of Cu/Mn was 2, the isothermal impregnation method was used, and the calcination temperature was 550 ?, the performance of the catalyst for catalytic combustion of benzene was the most excellent, compared with the catalysts prepared by other conditions, the multi-stage reduction process between the Cu-Mn occurred , and the amount of Cu²⁺ reached the highest, at the same time, Mn²⁺, Mn³⁺ and Mn4+ the three kinds of Mn species existed, the interaction between Cu and Mn was the strongest.In this paper, we studied the effect of catalyst carriers on the catalytic combustion of benzene, and different oxide carriers, different molecular sieve carriers were studied, there was a great difference in the performance of the prepared catalyst, the specific surface area and SiO2/Al₂O₃ of the molecular sieve carriers had a certain impact on the performance of the catalysts, mainly SiO2/Al₂O₃ had a greater impact on the catalyst performance, when the SiO2/Al₂O₃ gradually increased, the acidity of the catalyst first gradually strengthened, and then weakened, the catalyst activity was first enhanced, and then weakened, the catalyst with SiO2/Al₂O₃=360 had the best activity, the amount of Cu²⁺ reached the highest, at the same time, Mn²⁺, Mn³⁺ and Mn4+the three kinds of Mn species existed, the interaction between Cu and Mn was the strongest. And the stability of the catalyst was also excellent.