Effect of Mn Promoter on Structure and Properties of Mn Modified CuO-ZnO-ZrO2/HZSM-5 Catalysts for Synthesis of Dimethyl Ether from CO2 Hydrogenation
Mn modified CuO-ZnO-ZrO2/HZSM-5 catalysts for dimethyl ether synthesis from hydrogenation of CO2 were directly prepared by parallel-flow-coprecipitation method,using anhydrous ethanol as solvent,and oxalic acid as precipitator.The catalytic performance of the catalyst was studied.The influence of Mn content was investiga-ted.XRD,BET,TPR and NH3-TPD were employed to investigate the surface structure and performance of the catalysts.The results indicated 1% MnOx modified catalyst could provide a suitable surface acidity,exhibited higher DME selectivity and lower CO selectivity since Mn addition can promote disperse of ZnO and CuO,decrease the reduce temperature of CuO,increase the specific surface area and therefore promote the conversion of CO2 and improve the activity of the catalyst.
CO2 hydrogenationCuO-ZnO-ZrO2/HZSM-5 catalystMn promoter
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