In this paper, the hydrogenation of carbon monoxide over Cu-MnO x/Al 2O 3 composite catalysts system prepared by impregnation method has been studied The effects of addition of MnO x on activity and DME selectivity for hydrogenation of Cu-MnO x/Al 2O 3 catalysts were investigated by a micro reactor-GC system The crystal structure and reduction property of the catalysts were also studied by means of XRD, TPR The results indicated that the addition of MnO x increased the activity and DME selectivity of CuO/Al 2O 3 catalyst for the hydrogenation of carbon monoxide, and the most active and selective for DME is the catalyst with a molar ratio of Cu/Mn=1∶1 The addition of MnO x cause the TPR peak of CuO/Al 2O 3 to move to a high temperature; at the same time, the hydrogen spillover on Cu made MnO x reduction easier The results of XRD indicated that the addition of MnO x increased the dispersion of CuO on γ-Al 2O
