CO adsorption on β zeolite with highly dispersed CuCl 2·2H 2O was studied by IR spectroscopy. The results of XRD and 29 Si NMR indicate that CuCl 2·2H 2O is highly dispersed into β zeolite channel as a mon...CO adsorption on β zeolite with highly dispersed CuCl 2·2H 2O was studied by IR spectroscopy. The results of XRD and 29 Si NMR indicate that CuCl 2·2H 2O is highly dispersed into β zeolite channel as a monolayer. The IR spectra of adsorbed CO on the zeolites demonstrate that two distinct types of adsorption sites exist in the zeolites, i.e ., cation and non cation exchange sites. Two simultaneous processes, solid phase ion exchange and molecular diffusion, are involved in the dispersion of CuCl 2·2H 2O.展开更多
Electrocrystallizations of copper from both CuCl_2 silica sol and aqueous solutions were studied by the chronoamperometry technique.It was found that current density contributions of the double-layer charging（iDL） i...Electrocrystallizations of copper from both CuCl_2 silica sol and aqueous solutions were studied by the chronoamperometry technique.It was found that current density contributions of the double-layer charging（iDL） in current-time transients（CTTs） from both of the solutions were large.An adsorption-nucleation based model was proposed to analyze quantitatively the CTTs,by which copper electrocrystallization mechanism was characterized as progressive nucleation with 3D growth（3DP） under diffusion control.The diffusion coefficient of copper ions and the AN_∞products in aqueous solutions were larger than that in silica sols, which indicated that copper nucleation was inhibited in sol solution.The large iDL may be resulted from the adsorption of chloride ions on the electrode surface.展开更多
The diffusion coefficients of CuCl_2 in aqueous solutions of CuCl_2 and CuCl_2-HCl were measured respectively at 298 K with diaphragm cell method. The concentration dependence of CuCl_2 diffusion coefficient in single...The diffusion coefficients of CuCl_2 in aqueous solutions of CuCl_2 and CuCl_2-HCl were measured respectively at 298 K with diaphragm cell method. The concentration dependence of CuCl_2 diffusion coefficient in single CuCl_2 solutions and in mixed CuCl_2 -HCl solutions was discussed on the changes in chemical potential as well as in viscosity.展开更多
Our objectives were to develop a new chemical method for the polymerization of pyrrole. CuCl_2 dissolved in C_2H_5OH solvent is primarily used for the initiation polymerization of pyrrole. The polymers with different ...Our objectives were to develop a new chemical method for the polymerization of pyrrole. CuCl_2 dissolved in C_2H_5OH solvent is primarily used for the initiation polymerization of pyrrole. The polymers with different yield and conductivity were obtained by raring the initial concentration of Cu^(2+). The initial concentrations of Cu^(2+) varied from 1.2 × 10^(-4) mole to 6.48 × 10^(-3) mole Cu^(2+) with 2.16 × 10^(-2) mole pyrrole. The polypyrrole obtained was characterized with elemental analyzer, XPS, IR spectroscopy, Four-point probe and SEM.展开更多
文摘CO adsorption on β zeolite with highly dispersed CuCl 2·2H 2O was studied by IR spectroscopy. The results of XRD and 29 Si NMR indicate that CuCl 2·2H 2O is highly dispersed into β zeolite channel as a monolayer. The IR spectra of adsorbed CO on the zeolites demonstrate that two distinct types of adsorption sites exist in the zeolites, i.e ., cation and non cation exchange sites. Two simultaneous processes, solid phase ion exchange and molecular diffusion, are involved in the dispersion of CuCl 2·2H 2O.
基金supported by Academic Program of Natural Science Foundation Project of CQ CSTC(No 2008BC4003)the Foundation of State Key Laboratory of Physical Chemistry of Solid Surfaces of Xiamen University(No2007)
文摘Electrocrystallizations of copper from both CuCl_2 silica sol and aqueous solutions were studied by the chronoamperometry technique.It was found that current density contributions of the double-layer charging（iDL） in current-time transients（CTTs） from both of the solutions were large.An adsorption-nucleation based model was proposed to analyze quantitatively the CTTs,by which copper electrocrystallization mechanism was characterized as progressive nucleation with 3D growth（3DP） under diffusion control.The diffusion coefficient of copper ions and the AN_∞products in aqueous solutions were larger than that in silica sols, which indicated that copper nucleation was inhibited in sol solution.The large iDL may be resulted from the adsorption of chloride ions on the electrode surface.
文摘The diffusion coefficients of CuCl_2 in aqueous solutions of CuCl_2 and CuCl_2-HCl were measured respectively at 298 K with diaphragm cell method. The concentration dependence of CuCl_2 diffusion coefficient in single CuCl_2 solutions and in mixed CuCl_2 -HCl solutions was discussed on the changes in chemical potential as well as in viscosity.
文摘Our objectives were to develop a new chemical method for the polymerization of pyrrole. CuCl_2 dissolved in C_2H_5OH solvent is primarily used for the initiation polymerization of pyrrole. The polymers with different yield and conductivity were obtained by raring the initial concentration of Cu^(2+). The initial concentrations of Cu^(2+) varied from 1.2 × 10^(-4) mole to 6.48 × 10^(-3) mole Cu^(2+) with 2.16 × 10^(-2) mole pyrrole. The polypyrrole obtained was characterized with elemental analyzer, XPS, IR spectroscopy, Four-point probe and SEM.
