Preparation And Characterization Of MCF Supported CuO-CeO₂ And Its Catalytic Activity For CO Oxidation

CuO-CeO₂ catalyst has excellent catalytic performance for CO oxidation at low temeperature, which can be attributed to the superior ability to store and release oxygen, and the larger CO adsorption capacity. The previous studies found that the larger amount of the interface between Cu-Ce is the key to catalytic performance. In this work, a series of supported CuO-CeO₂/MCF catalysts were prepared, and their physicochemical properties and catalytic performance for CO oxidation were investigated. The main results obtained are as follows:A series of CuO-CeO₂ catalysts supported on mesoporous silica （SBA-15, KIT-6, and MCF） were prepared, and their catalytic activity was investigated by low-temperature CO oxidation reaction test. The results show that CuO-CeO₂/MCF catalyst has the highest catalytic activity, which can be attributed to the large specific surface area, pore size, pore volume, and more opened 3D-structure. These characteristics make bimetallic （Cu⁺Ce）highly dispersed, allow a better transportation of reactants and products in the mesoporous network in case of partial pore blocking.A series of supported CuO-CeO₂/MCF catalysts with various metal loadings （10-40 wt%）were prepared. The effect of metal loading on the catalytic performances of the CuO-CeO₂/MCF catalysts for CO oxidation was investigated. The results show that the ratios of highly dispersed copper species, Cu⁺, and Ce （Ⅲ） in CuO-CeO₂/MCF catalysts are decreased with the increase in metal loading from 10 to 40 wt%. Furthermore, the actual amounts of highly dispersed copper species, Cu⁺,and Ce （Ⅲ） in CuO-CeO₂VMCF catalysts increased first and then decreased with the increase of metal loading.A series of supported CuO-CeO₂/MCF catalysts with various Cu/Ce ratios and calcination temperatures were prepared. Their physicochemical properties and catalytic activity were investigated by various techniques. These results show that the optimum Cu/Ce ratio for 30% CuO-CeO₂/MCF catalysts was 2:8 （w/w）. For that ratio the catalysts has the largest amount of highly dispersed CuO-CeO₂ interface. The crystal size of CuO species and CeO₂ species enlarged slightly with the increase in calcination temperature from 400 ℃ to 700 ℃. Also, the crystal size of CuO species and CeO₂ species influence the interactions between CuO and CeO₂.