尿素水解均匀沉淀法制Cu/ZnO/Al2O3甲醇合成催化剂

In view of not uniformity in conventional coprecipitation preparation, urea was used as the precursor of precipitator to prepare Cu/ZnO/Al2O3 catalysts for methanol synthesis. In the method, urea was dissolved in nitrate solution and hydrolyzed to produce OH－ as precipitator after the solution was heated to 90 ℃. After 6 h, the precipitation was accomplished. The evaluation results of the catalyst activity showed that this catalyst had comparable catalytic activities to the industrial catalyst, and reached its maximum activity at 250 ℃. At reaction conditions of 250 ℃, 3 MPa, and SV=7 600 h－1, the STY of methanol was 0.38 g/(mL·h) with syngas compositing of H2,CO, CO2, and N2 at molar ratio of 65.9∶27.1∶2.9∶4.1. X-ray Diffraction (XRD) revealed that the particle size of CuO and ZnO was about 200 nm, and Al existed in the form of ZnAl2O4 spinel in the catalysts.