Copper(Ⅱ) oxides powder catalysts were prepared by three different methods,thermal decomposition,solid phase reaction and chemical precipitation.The phase,surface structure,morphology,particle size and catalytic acti...Copper(Ⅱ) oxides powder catalysts were prepared by three different methods,thermal decomposition,solid phase reaction and chemical precipitation.The phase,surface structure,morphology,particle size and catalytic activity of the powder for H 2O 2 decomposition were investigated by XRD,SEM,FT IR and the surface area measurement techniques.These studies revealed that high low sequence of catalytic activity of powder prepared by three different methods is opposite from their surface area,and that catalytic activity of the powder is principally related to its surface structure and active compositions.展开更多
Nanopowder MnO 2 was prepared with two oxidation reduction methods.XRD,SEM,FT IR and surface area measurement techniques were used to investigate properties of the MnO 2 powder.The results showed that the nano MnO 2 w...Nanopowder MnO 2 was prepared with two oxidation reduction methods.XRD,SEM,FT IR and surface area measurement techniques were used to investigate properties of the MnO 2 powder.The results showed that the nano MnO 2 with an average diameter in 30～50nm and good dispersity and high catalytic activity for H 2O 2 decomposition,can be synthesized with the two methods.With reduced crystal size of the powder,the infrared absorption peak of Mn O bond was blue shifted and fissioned,one shifted 61 19cm -1 and the other shifted 11 15cm -1 ,and the characteristic vibration bands of adsorption water were also blue shifted.展开更多
Benzaldehyde was prepared from the addition hydrolysis reaction of C 6H 5MgBr with 1,3 dimethylbenzimidazolium iodide.The reaction mechanism is suggested and discussed.
文摘Copper(Ⅱ) oxides powder catalysts were prepared by three different methods,thermal decomposition,solid phase reaction and chemical precipitation.The phase,surface structure,morphology,particle size and catalytic activity of the powder for H 2O 2 decomposition were investigated by XRD,SEM,FT IR and the surface area measurement techniques.These studies revealed that high low sequence of catalytic activity of powder prepared by three different methods is opposite from their surface area,and that catalytic activity of the powder is principally related to its surface structure and active compositions.
文摘Nanopowder MnO 2 was prepared with two oxidation reduction methods.XRD,SEM,FT IR and surface area measurement techniques were used to investigate properties of the MnO 2 powder.The results showed that the nano MnO 2 with an average diameter in 30～50nm and good dispersity and high catalytic activity for H 2O 2 decomposition,can be synthesized with the two methods.With reduced crystal size of the powder,the infrared absorption peak of Mn O bond was blue shifted and fissioned,one shifted 61 19cm -1 and the other shifted 11 15cm -1 ,and the characteristic vibration bands of adsorption water were also blue shifted.
文摘Benzaldehyde was prepared from the addition hydrolysis reaction of C 6H 5MgBr with 1,3 dimethylbenzimidazolium iodide.The reaction mechanism is suggested and discussed.
