Catalyst for synthesizing methanol and preparing process thereof

The invention relates to a synthetic methanol catalyst as well as the preparation method thereof. The synthetic methanol catalyst of the invention is composed of the oxides of Cu, Zn, Al and Si, wherein, SiO2 modified Al2O3 is adopted as a carrier, Cu and Zn are active constituents, and the mol ratio of the component elements is as follows: Cu:Zn:Al:Si is equal to (5-6):(2-3):(0.8-1):(0.0016-0.05). The method used for preparing the synthetic methanol catalyst of the invention is divided into 3 steps: firstly, the coprecipitation method is adopted to form the coprecipitate of Al and Si compounds; secondly, the coprecipitation method is adopted to form the coprecipitate of Cu and Zn compounds; finally, the two obtained coprecipitates are mixed according to a certain proportion and aged, and the synthetic methanol catalyst of the invention can be obtained after filtering, washing, drying and baking. The catalyst of the invention has the advantages of high specific surface area, good surface acidity and basicity balance degree and high catalytic activity.