Effect of CeO2 Promoter on Catalytic Performance of CuO-ZnO-ZrO2/HZSM-5 Catalyst for Carbon Dioxide Hydrogenation into Dimethyl Ether

A series of CuO-ZnO-CeO2-ZrO2/HZSM-5 catalysts were prepared and characterized by XRD, H-2-TPR. CO2 hydrogenation to DME was carried out in a fixed bed reactor to test the catalytic performance of Ce-modified CuO-ZnO-ZrO2/HZSM-5 catalyst under the condition of GHSV=1800 h(-1), p=3.0 MPa and T=250 degrees C. The results indicate that the added CeO2 improved the performance of the bifunctional catalysts, the CO2 conversion and DME selectivity were obviously improved. CuO-ZnO-CeO2-ZrO2/HZSM-5 catalyst with Ce to Zr molar ratio of 1/1 showed the highest activity for DME synthesis from CO2 hydrogenation.