锂离子二次电池是手提设备的重要电力来源。近年来,人们为了寻找更新颖更好的锂离子电极材料,开始研究晶形离子交换材料,这种材料具有开放孔道,能够让离子在多孔框架里自由的进出。一种具有层状结构的钛硅酸盐Na-JDF-L1(Na_4Ti_2Si_8O_(...锂离子二次电池是手提设备的重要电力来源。近年来,人们为了寻找更新颖更好的锂离子电极材料,开始研究晶形离子交换材料,这种材料具有开放孔道,能够让离子在多孔框架里自由的进出。一种具有层状结构的钛硅酸盐Na-JDF-L1(Na_4Ti_2Si_8O_(22)·4H_2O)经过离子交换后被用作锂离子负极材料。它在循环200次后放电容量保持在364 m Ah·g^(-1),并且库伦效率约为100%。通过将TiO_2引入Li(Na)-JDF-L1中,有效的提高了材料的首次库伦效率和倍率放电性能。展开更多
An intrinsic kinetics of cyclohexanone ammoximation in the liquid phase over titanium silicate molecular sieves is investigated in an isothermal slurry reactor at different initial reactant concentrations, catalyst lo...An intrinsic kinetics of cyclohexanone ammoximation in the liquid phase over titanium silicate molecular sieves is investigated in an isothermal slurry reactor at different initial reactant concentrations, catalyst loading, and reaction temperature. The rate equations are developed by analyzing data of kinetic measurements. More than 10 side reactions were found. H2O2 decomposition reaction must be considered and other side reactions can be neglected in the kinetic modeling. The predicted values of reaction rates based on the kinetic models are almost consistent with experimental ones. The models have guidance to the selection of reactor types and they are useful to the design and operation of reactor used.展开更多
文摘锂离子二次电池是手提设备的重要电力来源。近年来,人们为了寻找更新颖更好的锂离子电极材料,开始研究晶形离子交换材料,这种材料具有开放孔道,能够让离子在多孔框架里自由的进出。一种具有层状结构的钛硅酸盐Na-JDF-L1(Na_4Ti_2Si_8O_(22)·4H_2O)经过离子交换后被用作锂离子负极材料。它在循环200次后放电容量保持在364 m Ah·g^(-1),并且库伦效率约为100%。通过将TiO_2引入Li(Na)-JDF-L1中,有效的提高了材料的首次库伦效率和倍率放电性能。
文摘An intrinsic kinetics of cyclohexanone ammoximation in the liquid phase over titanium silicate molecular sieves is investigated in an isothermal slurry reactor at different initial reactant concentrations, catalyst loading, and reaction temperature. The rate equations are developed by analyzing data of kinetic measurements. More than 10 side reactions were found. H2O2 decomposition reaction must be considered and other side reactions can be neglected in the kinetic modeling. The predicted values of reaction rates based on the kinetic models are almost consistent with experimental ones. The models have guidance to the selection of reactor types and they are useful to the design and operation of reactor used.
文摘以硫酸钛为钛源,白炭黑为硅源,通过溶胶-凝胶法制备层状钛硅酸盐,采用层状钛硅酸盐作为前驱体,以正癸胺作为插层试剂,进行插层反应,探索体系的酸碱度、温度和反应时间对插层反应的影响,总结出插层反应的最佳条件.结果表明,正癸胺插层的最佳反应条件为:反应体系pH=10,反应温度为80℃,反应时间为4 d.
