With an increase in carbon dioxide (CO2) concentration in the atmosphere, global warming problems are becoming more and more serious in recent years. Conversion of CO2 to useful chemicals is one of the most promising ways to utilize CO2. Methanol synthesis by CO2 hydrogenation is of great significance from the viewpoint of environmental protection, energy sources and chemical industry, because methanol is a common chemical feedstock for several important chemicals and a potential alternative energy to fossi...