The process of obtaining of high quality Mn-Zn,Mn-Cu and Mn-Cu-Zn alloy coatings from complexing ligands--citrate,EDTA(ethylene diaminetetra acetic acid)and nitrilotriacetic acid solutions was studied.Factors affectin...The process of obtaining of high quality Mn-Zn,Mn-Cu and Mn-Cu-Zn alloy coatings from complexing ligands--citrate,EDTA(ethylene diaminetetra acetic acid)and nitrilotriacetic acid solutions was studied.Factors affecting stability of solutions containing ligand or ligands and influence of electrolysis parameters:electrolyte composition,pH,cathodic current density on chemical composition of the obtained coatings,on their current efficiency,morphology and structure were investigated.展开更多
A series of Mn-Cu mixed oxide catalysts were prepared by precipitation method. The catalysts were characterized by N2 adsorp- tion-desorption, H2-TPR and XPS. When the loading ratio of manganese oxides to copper oxide...A series of Mn-Cu mixed oxide catalysts were prepared by precipitation method. The catalysts were characterized by N2 adsorp- tion-desorption, H2-TPR and XPS. When the loading ratio of manganese oxides to copper oxides was 8：2 or 7：3, the catalysts possessed better catalytic activity, and benzene was converted completely at 558 K. Results of H2-TPR showed that the loading of a small amount of copper oxides decreased the reduction temperature of catalysts. Results of XPS showed that the loading of a small amount of copper oxides increased the proportion of manganese and defective oxygen on the surface of catalysts, and stabilized manganese at higher oxidation state. And the catalyst with the loading ratio 7：3 was a little worse than 8：2, since the interaction between manganese oxides and copper oxides is too strong, copper oxides migrate to the surface of catalysts and manganese oxides in excess are immerged.展开更多
文摘The process of obtaining of high quality Mn-Zn,Mn-Cu and Mn-Cu-Zn alloy coatings from complexing ligands--citrate,EDTA(ethylene diaminetetra acetic acid)and nitrilotriacetic acid solutions was studied.Factors affecting stability of solutions containing ligand or ligands and influence of electrolysis parameters:electrolyte composition,pH,cathodic current density on chemical composition of the obtained coatings,on their current efficiency,morphology and structure were investigated.
基金Project supported by National Natural Science Foundation of China (20773090)the National High Technology Research and Development Program of China (863 Program, 2006AA06Z347)the Youth Fund of Sichuan University (2008119)
文摘A series of Mn-Cu mixed oxide catalysts were prepared by precipitation method. The catalysts were characterized by N2 adsorp- tion-desorption, H2-TPR and XPS. When the loading ratio of manganese oxides to copper oxides was 8：2 or 7：3, the catalysts possessed better catalytic activity, and benzene was converted completely at 558 K. Results of H2-TPR showed that the loading of a small amount of copper oxides decreased the reduction temperature of catalysts. Results of XPS showed that the loading of a small amount of copper oxides increased the proportion of manganese and defective oxygen on the surface of catalysts, and stabilized manganese at higher oxidation state. And the catalyst with the loading ratio 7：3 was a little worse than 8：2, since the interaction between manganese oxides and copper oxides is too strong, copper oxides migrate to the surface of catalysts and manganese oxides in excess are immerged.
