The influence of adsorbed CO diffusion on the first order phase transition point (y2)of CO oxidation based on Langmuir-Hinshelwood mechanism was studied in detail by Monte Carlo simulation. It was found that CO diffus...The influence of adsorbed CO diffusion on the first order phase transition point (y2)of CO oxidation based on Langmuir-Hinshelwood mechanism was studied in detail by Monte Carlo simulation. It was found that CO diffusion increased the value of the first order phase transition point(y2) and when the ratio(k) of diffusion probability of adsorbed CO to adsorption probability of CO is 100, y2 is equal to 0.642. The correlated y2 value is in good agreement with the theoretical result(O.65) obtained by Mai when k approaches to infinity large.展开更多
This Paper describes an experimental met,that that established a local Pt/Nafion interface on the Platinum Plane, so that the boundary conditions and the initial condition of the (diffusion equation about the diffusio...This Paper describes an experimental met,that that established a local Pt/Nafion interface on the Platinum Plane, so that the boundary conditions and the initial condition of the (diffusion equation about the diffusion of adsorbde hydrogen atom the platinum plane can be controlled.The average diffusion coefficient of underpotential deposition of hydrogen on a surface of platinum was obained for the first time and D=1.50 ×10-4cm2.s-1.The accuracy of the datum was discussed.展开更多
A flat and compact Al2O3 film of 20urn in thickness was prepared on the substrate of Si wafer by magnetic controlled sputtering Al reaction with O2 in Ar. A small amount of MoO3 was va- porized in vacuum and deposited...A flat and compact Al2O3 film of 20urn in thickness was prepared on the substrate of Si wafer by magnetic controlled sputtering Al reaction with O2 in Ar. A small amount of MoO3 was va- porized in vacuum and deposited onto a slot in a covering film on the surface of A12O3 film. The samples were heated in dry or wet N2, O2 and air respectively, characterized by TRSRF, AES, XPS, XRD and SEM to study the surface diffusion of MoO3 on the A12O3 film. The results show that MoO3 can diffuse on the surface of Al2O3 film by heating the samples at 573K or 673K. The diffusion rate increases with the heating temperature. moisture can accelerate the diffusion rate of MoO3 on the surface of Al2O3.展开更多
文摘The influence of adsorbed CO diffusion on the first order phase transition point (y2)of CO oxidation based on Langmuir-Hinshelwood mechanism was studied in detail by Monte Carlo simulation. It was found that CO diffusion increased the value of the first order phase transition point(y2) and when the ratio(k) of diffusion probability of adsorbed CO to adsorption probability of CO is 100, y2 is equal to 0.642. The correlated y2 value is in good agreement with the theoretical result(O.65) obtained by Mai when k approaches to infinity large.
文摘This Paper describes an experimental met,that that established a local Pt/Nafion interface on the Platinum Plane, so that the boundary conditions and the initial condition of the (diffusion equation about the diffusion of adsorbde hydrogen atom the platinum plane can be controlled.The average diffusion coefficient of underpotential deposition of hydrogen on a surface of platinum was obained for the first time and D=1.50 ×10-4cm2.s-1.The accuracy of the datum was discussed.
文摘A flat and compact Al2O3 film of 20urn in thickness was prepared on the substrate of Si wafer by magnetic controlled sputtering Al reaction with O2 in Ar. A small amount of MoO3 was va- porized in vacuum and deposited onto a slot in a covering film on the surface of A12O3 film. The samples were heated in dry or wet N2, O2 and air respectively, characterized by TRSRF, AES, XPS, XRD and SEM to study the surface diffusion of MoO3 on the A12O3 film. The results show that MoO3 can diffuse on the surface of Al2O3 film by heating the samples at 573K or 673K. The diffusion rate increases with the heating temperature. moisture can accelerate the diffusion rate of MoO3 on the surface of Al2O3.
