Study On PdCl₂-CuCl₂ Catalyst For Carbon Monoxide Catalytic Oxidation At Room Temperature

In this thesis, the supported PdCl2-CuCl2 catalyst exhibited high activity for CO oxidation at room temperature. We studied its catalytic properties and factors affecting the reaction activity.In this paper, the catalyst was prepared by the method of incipient impregnation technique. The results showed that different supports and loadings of active component had the effect on catalytic activity. Whenγ-A12O3 was chosen as the support, catalyst exhibited much better catalytic activity than other supports. When the loading was 2%Pd-2%Cu, the catalytic activity would be the best. The catalyst had high activity and long-term stability. Then the optimum conditions for preparation were determined. At room temperature, with the CO concentration at 2.23×10-4mol/L, the CO conversion of 2%Pd-2%Cu catalyst would reach 90%. In addition, Cu(NO3)2 and FeCl3 were respectively instead of CuCl2, which provided Cu2+ and Cl" for the system, but the catalytic activity was low. Meanwhile, CO oxidation was considered as the target reaction, and the evaluation conditions which influencing the catalytic performance were investigated The presence of water vapor was prerequisite for the catalytic reaction, and the reaction temperature had less impact on the catalytic performance. Particularly, the reaction gas concentration significantly affected the catalytic performance. Catalyst exhibited the best catalytic activity at the CO concentration of 1.34×10-4mol/L. In addition, impacts that influencing the catalytic performance like O2 concentration, adding heteroatom, and catalyst particle size were studied.The catalyst was characterized by SEM, XRD and XPS techniques. The surface morphology of the catalyst and the active component state were investigated. According to the results of evaluation, the catalytic reaction was investigated by FTIR. At last, we speculated a possible reaction mechanism of the catalytic process.Furthermore, the kinetics of CO oxidation over PdCl2-CuCl2/Y-Al203 catalysts was investigated by means of recycling reactor and the kinetic model was obtained. The results showed that the dynamic model obtained a good correlation and high reliability with the verification of statistics.