制备方法对CuZnGa催化剂CO2加氢制甲醇催化性能的影响OA

Methanol is an important basic chemical feedstock and energy carrier.Utilizing CO2 catalytic hydrogenation to methanol can alleviate energy shortages to a certain extent while also aligning with the demands of green economic development.CuZnGa catalysts were synthesized using three different methods(co-precipitation,hydrothermal and sol-gel methods).Their catalytic performances were systematically compared in CO2 hydrogenation to methanol reaction.Characterization techniques including XRD,TEM,N2 adsorption/desorption,XPS,CO2-TPD,and H2-TPR were used to analyze their physicochemical properties.The results show that among three catalysts,the catalyst prepared by co-precipitation exhibits largest specific surface area(49.0 m2/g)and highest relative oxygen vacancy(19.8％),providing abundant active sites for CO2 activation and conversion.Under reaction conditions of 260℃,4 MPa and 7500 mL/(g·h)for 10 h,it achieves CO2 conversion rate of 15.8％and methanol selectivity of 56.4％,outperforming other catalysts.