Carbon tetrachloride is an ozone depleting chemical, while chloroform is not Therefore it is important for the catalytic hydrodechlorination of CCl 4 to CHCl 3 In this paper, kinetics on the catalytic hydrogenation of...Carbon tetrachloride is an ozone depleting chemical, while chloroform is not Therefore it is important for the catalytic hydrodechlorination of CCl 4 to CHCl 3 In this paper, kinetics on the catalytic hydrogenation of carbon tetrachloride to chloroform in liquid phase was studied A reaction mechanism was proposed Hydrogen molecular was activated on the surface of catalyst, the activated hydrogen atom then reacted with CCl 4 in the solution and produced CHCl 3 A definite kinetic equation could be deduced from the reaction mechanism The reaction rate constant is concerned with the intial concentration of CCl 4 in the solution, pressure, reaction temperature and the concentration of active center All these factors were investigated over Pt Pd/C catalyst and fit in with the kinetic equation The activation energy of the reaction is 86?KJ/mol according to the experimental results [WT5H1]展开更多
Hydrogenation kinetics of MLNi3.8(Co,Mn,Al)1.2 and MLNi3.7(Co,Mn,Al)1.2Cu0.1 alloy in α + β phase at the temperatUre range of 30 ～70 ℃ has been studied. The kinetic mechanism of hydrogen absorption is not affecte...Hydrogenation kinetics of MLNi3.8(Co,Mn,Al)1.2 and MLNi3.7(Co,Mn,Al)1.2Cu0.1 alloy in α + β phase at the temperatUre range of 30 ～70 ℃ has been studied. The kinetic mechanism of hydrogen absorption is not affected by initial hydrogen pressure. Temperature does not influence the rate of hydrogen absorption obviously. In the prior and later period of hydrogen absorption the rate-controlling step is chemical reaction and hydrogen diffusion in the hydride phase respectively for MLNi3.8(Co,Mn,Al)1.2 alloy. Adding Cu, the rate-controlling step changes from chemical reaction to the nucleation and growth of β phase in the prior period and the process of hydrogen absorption still controlled by diffusion in the later period.展开更多
Over the last decade’s magnesium and magnesium based compounds have been intensively investigated as potential hydrogen storage as well as thermal energy storage materials due to their abundance and availability as w...Over the last decade’s magnesium and magnesium based compounds have been intensively investigated as potential hydrogen storage as well as thermal energy storage materials due to their abundance and availability as well as their extraordinary high gravimetric and volumetric storage densities.This review work provides a broad overview of the most appealing systems and of their hydrogenation/dehydrogenation properties.Special emphasis is placed on reviewing the efforts made by the scientific community in improving the material’s thermodynamic and kinetic properties while maintaining a high hydrogen storage capacity.展开更多
文摘Carbon tetrachloride is an ozone depleting chemical, while chloroform is not Therefore it is important for the catalytic hydrodechlorination of CCl 4 to CHCl 3 In this paper, kinetics on the catalytic hydrogenation of carbon tetrachloride to chloroform in liquid phase was studied A reaction mechanism was proposed Hydrogen molecular was activated on the surface of catalyst, the activated hydrogen atom then reacted with CCl 4 in the solution and produced CHCl 3 A definite kinetic equation could be deduced from the reaction mechanism The reaction rate constant is concerned with the intial concentration of CCl 4 in the solution, pressure, reaction temperature and the concentration of active center All these factors were investigated over Pt Pd/C catalyst and fit in with the kinetic equation The activation energy of the reaction is 86?KJ/mol according to the experimental results [WT5H1]
文摘Hydrogenation kinetics of MLNi3.8(Co,Mn,Al)1.2 and MLNi3.7(Co,Mn,Al)1.2Cu0.1 alloy in α + β phase at the temperatUre range of 30 ～70 ℃ has been studied. The kinetic mechanism of hydrogen absorption is not affected by initial hydrogen pressure. Temperature does not influence the rate of hydrogen absorption obviously. In the prior and later period of hydrogen absorption the rate-controlling step is chemical reaction and hydrogen diffusion in the hydride phase respectively for MLNi3.8(Co,Mn,Al)1.2 alloy. Adding Cu, the rate-controlling step changes from chemical reaction to the nucleation and growth of β phase in the prior period and the process of hydrogen absorption still controlled by diffusion in the later period.
文摘Over the last decade’s magnesium and magnesium based compounds have been intensively investigated as potential hydrogen storage as well as thermal energy storage materials due to their abundance and availability as well as their extraordinary high gravimetric and volumetric storage densities.This review work provides a broad overview of the most appealing systems and of their hydrogenation/dehydrogenation properties.Special emphasis is placed on reviewing the efforts made by the scientific community in improving the material’s thermodynamic and kinetic properties while maintaining a high hydrogen storage capacity.
