The intrinsic kinetics of water gas shift reaction over Pt/CeO 2-ZrO 2 was investigated.Experiments were carried out by means of orthogonal design.Parameters of power-type rate model of water gas shift reaction were d...The intrinsic kinetics of water gas shift reaction over Pt/CeO 2-ZrO 2 was investigated.Experiments were carried out by means of orthogonal design.Parameters of power-type rate model of water gas shift reaction were determined by the non-linear least-square parameter estimation method.The kinetics of water gas shift reaction over Pt/CeO 2-ZrO 2 was different from that of common commercial catalysts.The accuracy of experimental data and kinetics model was proved by F-examination.展开更多
The formation processes of a composite ceramic coating on AM50 magnesium alloy prepared by plasma electrolytic oxidation （PEO） in a K 2 ZrF 6 electrolyte solution were studied by scanning electron microscope （SEM）...The formation processes of a composite ceramic coating on AM50 magnesium alloy prepared by plasma electrolytic oxidation （PEO） in a K 2 ZrF 6 electrolyte solution were studied by scanning electron microscope （SEM） and energy dispersive X-ray spectroscope （EDX）. Electrochemical impedance spectroscopy （EIS） tests were used to study the variation of the corrosion resistance of the coating during the PEO treatment. The results show that the coating formed on Mg alloy is mainly composed of MgO and MgF 2 when the applied voltage is lower than the sparking voltage, and zirconium oxides start to be deposited on Mg substrate after the potential exceeding the sparking voltage. The corrosion resistance of the coating increases with increasing the applied voltage.展开更多
文摘The intrinsic kinetics of water gas shift reaction over Pt/CeO 2-ZrO 2 was investigated.Experiments were carried out by means of orthogonal design.Parameters of power-type rate model of water gas shift reaction were determined by the non-linear least-square parameter estimation method.The kinetics of water gas shift reaction over Pt/CeO 2-ZrO 2 was different from that of common commercial catalysts.The accuracy of experimental data and kinetics model was proved by F-examination.
基金Project(2007CB613705)supported by the National Basic Research Program of ChinaProject(50901082)supported by the NationalNatural Science Foundation of China
文摘The formation processes of a composite ceramic coating on AM50 magnesium alloy prepared by plasma electrolytic oxidation （PEO） in a K 2 ZrF 6 electrolyte solution were studied by scanning electron microscope （SEM） and energy dispersive X-ray spectroscope （EDX）. Electrochemical impedance spectroscopy （EIS） tests were used to study the variation of the corrosion resistance of the coating during the PEO treatment. The results show that the coating formed on Mg alloy is mainly composed of MgO and MgF 2 when the applied voltage is lower than the sparking voltage, and zirconium oxides start to be deposited on Mg substrate after the potential exceeding the sparking voltage. The corrosion resistance of the coating increases with increasing the applied voltage.
