An Investigation Of Catalytic Effect Of Ceramic Ball-activated Carbon Supporting Cerium And Zirconium Ingredient In CWAO

The aim of this work is to put forward a catalyst preparation technique in which cerium oxide and zirconium oxide were the active ingredient supported by ceramic ball-activated carbon through impregnation and calcination process for CWAO (catalytic wet air oxidation) phenolic resin wastewater treatment. With the COD removal efficiency as indicator, the research concentrated on the effects of single active ingredient CeO2or ZrO2loading quantity, calcination temperature and calcination time, loading order of CeO2and ZrO2(CexZr1-xO2), and molar ratio of CeO2and ZrO2on the catalytic activity. The catalytic activity of carrier supporting CexZr1-xO2or single-component CeO2or ZrO2was compared. It was indicated by BET and XRD that the catalyst possessed a larger specific surface area and uniform active ingredient distribution with the molar ratio of CeO2of ZrO2equal to8:2, which proved the mechanism of better catalytic effect of two active ingredients load than single active ingredient. The process of the reactor loading CexZr1-xO2/KC catalyst experienments showed that under the temperature of240℃, COD degradation rate could be as high as93.72%, it had good catalytic degradation effects with pH value from1.5to10.6. when the reaction time was maintained for about60mins.The two-stage first-order kinetics model was built to analyze the catalyst systems, which indicated the system efficiency improvement of adding catalyst CexZr1-xO2/KC through the perspective of the reaction rate constant k and activation energy Eα. Besides, the middle-scale equipment of continuous bubble column reactor was designed and installed, and the first-order kinetic model of reactor was built to forecast the COD degradation effect.