Effect of Al_2O_3 content on the adsorptive properties of Cu/ZnO/Al_2O_3 for removal of odorant sulfur compounds

摘要

Cu/ZnO/Al_2O_3 adsorbents for removal of odorant sulfur compounds were prepared with various Al/Cu molar ratios by co-precipitation method. The sulfur removing ability as a function of Al/Cu molar ratio of the adsorbents for t-butyl mercaptan (TBM), tetrahydro thiophene (THT), dimethyl disulfide (DMS) and H_2S were investigated at 250 ℃ and 6000 h~(-1) space velocity. Based on the results of adsorption capacity and characterization by various techniques, the optimum Al/Cu ratio for maximum sulfur removal capacity is found to be at Al/Cu molar ratio of 0.15 which possesses the well-dispersed Cu species with high reduc-ibility. The adsorption capacity is highest for H_2S followed by TBM, DMS and THT. The main role of Al_2O_3 component is to provide the dispersion of CuO species homogeneously with small particle formation and high reducibility.