Alcohol-assisted low-temperature methanol synthesis was conducted over Cu/ZnO;catalysts while varying the copper content（X）. Unlike conventional methanol synthesis, ethanol acted as both solvent and reaction interme...Alcohol-assisted low-temperature methanol synthesis was conducted over Cu/ZnO;catalysts while varying the copper content（X）. Unlike conventional methanol synthesis, ethanol acted as both solvent and reaction intermediate in this reaction, creating a different reaction pathway. The formation of crystalline phases and characteristic morphology of the co-precipitated precursors during the co-precipitation step were important factors in obtaining an efficient Cu/ZnO catalyst with a high dispersion of metallic copper,which is one of the main active sites for methanol synthesis. The acidic properties of the Cu/ZnO catalyst were also revealed as important factors, since alcohol esterification is considered the rate-limiting step in alcohol-assisted low-temperature methanol synthesis. As a consequence, bifunctionality of the Cu/ZnO catalyst such as metallic copper and acidic properties was required for this reaction. In this respect, the copper content（X） strongly affected the catalytic activity of the Cu/ZnO;catalysts, and accordingly, the Cu/ZnO;.5 catalyst with a high copper dispersion and sufficient acid sites exhibited the best catalytic performance in this reaction.展开更多
研究了PTFE悬浮量、表面活性剂复配量对复合化学镀膜的镀速、结构、成分、耐腐蚀性及耐磨性的影响,结果表明,PTFE悬浮量和表面活性剂复配量的提高,镀膜的镀速、铜的百分含量和摩擦系数均有大幅度的下降,腐蚀速度略有降低,镀膜的相结... 研究了PTFE悬浮量、表面活性剂复配量对复合化学镀膜的镀速、结构、成分、耐腐蚀性及耐磨性的影响,结果表明,PTFE悬浮量和表面活性剂复配量的提高,镀膜的镀速、铜的百分含量和摩擦系数均有大幅度的下降,腐蚀速度略有降低,镀膜的相结构没有大的变化,试验表明,Ni Cu P/PTFE复合化学镀膜具有优良的自润滑性能。展开更多
基金supported by C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science,ICT & Future Planning (2015M3D3A1A01064908)
文摘Alcohol-assisted low-temperature methanol synthesis was conducted over Cu/ZnO;catalysts while varying the copper content（X）. Unlike conventional methanol synthesis, ethanol acted as both solvent and reaction intermediate in this reaction, creating a different reaction pathway. The formation of crystalline phases and characteristic morphology of the co-precipitated precursors during the co-precipitation step were important factors in obtaining an efficient Cu/ZnO catalyst with a high dispersion of metallic copper,which is one of the main active sites for methanol synthesis. The acidic properties of the Cu/ZnO catalyst were also revealed as important factors, since alcohol esterification is considered the rate-limiting step in alcohol-assisted low-temperature methanol synthesis. As a consequence, bifunctionality of the Cu/ZnO catalyst such as metallic copper and acidic properties was required for this reaction. In this respect, the copper content（X） strongly affected the catalytic activity of the Cu/ZnO;catalysts, and accordingly, the Cu/ZnO;.5 catalyst with a high copper dispersion and sufficient acid sites exhibited the best catalytic performance in this reaction.
基金Supported by National Natural Science Foundation of China(NSFC)(61006092)the key incubation project of Shanghai Institute of Technical Physics(Chinese Academy of Science)
文摘 研究了PTFE悬浮量、表面活性剂复配量对复合化学镀膜的镀速、结构、成分、耐腐蚀性及耐磨性的影响,结果表明,PTFE悬浮量和表面活性剂复配量的提高,镀膜的镀速、铜的百分含量和摩擦系数均有大幅度的下降,腐蚀速度略有降低,镀膜的相结构没有大的变化,试验表明,Ni Cu P/PTFE复合化学镀膜具有优良的自润滑性能。
