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 fo...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展开更多
The hydrogenation of carbon dioxide over Cu-Mo/HZSM-5 composite catalysts prepared by an impregnation method has been studied. The reduction property and adsorption ability of the catalyst towards hydrogen and carbon ...The hydrogenation of carbon dioxide over Cu-Mo/HZSM-5 composite catalysts prepared by an impregnation method has been studied. The reduction property and adsorption ability of the catalyst towards hydrogen and carbon dioxide have been investigated by TPR and TPD-MS techniques. The results indicated that the addition of Mo increased the activity and dimethyl ether selectivity of Cu/HZSM-5 catalyst, the most active and selective for dimethyl ether was the catalyst with n (Cu)/n (Mo) = 5:1. The addition of Mo caused the TPR peaks of Cu/HZSM-5 to move to higher temperatures. CO2-TPD results revealed the raise of the adsorbability of the catalyst toward CO2.展开更多
A series of Mg Zn Al hydrotalcites like with different Mg/Zn molar ratios are synthesized by co precipitation method and characterized by XRD. The reactions of dehydrogenation or dehydration of isopropanol are carried...A series of Mg Zn Al hydrotalcites like with different Mg/Zn molar ratios are synthesized by co precipitation method and characterized by XRD. The reactions of dehydrogenation or dehydration of isopropanol are carried out using the Mg Zn Al mixed oxides obtained from calcination of Mg Zn Al hydrotalcites like. All of the Mg Zn Al mixed oxides show high catalytic activity on isopropanol dehydrogenation reaction. The acetone selectivity achieves more than 95%. The relation between catalytic activity and basicity of the catalysts is discussed by CO2 TPD technique.展开更多
文摘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
文摘The hydrogenation of carbon dioxide over Cu-Mo/HZSM-5 composite catalysts prepared by an impregnation method has been studied. The reduction property and adsorption ability of the catalyst towards hydrogen and carbon dioxide have been investigated by TPR and TPD-MS techniques. The results indicated that the addition of Mo increased the activity and dimethyl ether selectivity of Cu/HZSM-5 catalyst, the most active and selective for dimethyl ether was the catalyst with n (Cu)/n (Mo) = 5:1. The addition of Mo caused the TPR peaks of Cu/HZSM-5 to move to higher temperatures. CO2-TPD results revealed the raise of the adsorbability of the catalyst toward CO2.
文摘A series of Mg Zn Al hydrotalcites like with different Mg/Zn molar ratios are synthesized by co precipitation method and characterized by XRD. The reactions of dehydrogenation or dehydration of isopropanol are carried out using the Mg Zn Al mixed oxides obtained from calcination of Mg Zn Al hydrotalcites like. All of the Mg Zn Al mixed oxides show high catalytic activity on isopropanol dehydrogenation reaction. The acetone selectivity achieves more than 95%. The relation between catalytic activity and basicity of the catalysts is discussed by CO2 TPD technique.
