Kinetics of the Oxidation of Iron Carbide Dispersed in a Carbon Matrix with Water Vapor

2009 ◽  
Vol 113 (17) ◽  
pp. 4947-4953
Author(s):  
Walerian Arabczyk ◽  
Ewa Ekiert ◽  
Roman Jȩdrzejewski
Keyword(s):  
Water Vapor ◽  
Iron Carbide ◽  
Carbon Matrix ◽  
Kinetics Of

Study on Kinetics of Reaction between ZrNi5 and Water Vapor

2012 ◽  
Vol 581-582 ◽  
pp. 694-697
Author(s):  
Yong Yao ◽  
De Li Luo ◽  
Zhi Yong Huang ◽  
Jiang Feng Song
Keyword(s):  
Water Vapor ◽  
Reaction Rate ◽  
Arrhenius Equation ◽  
Tritiated Water ◽  
First Order ◽  
Order Chemical Reaction ◽  
First Order Chemical Reaction ◽  
Kinetics Of Reaction ◽  
Reaction Activation Energy ◽  
Kinetics Of

In order to evaluate the feasibility of tritium recovery from tritiated water by thermochemical decomposition using ZrNi5, the kinetics of reaction between ZrNi5 and water vapor was studied by thermogravimetric method in the temperature range from 673K to 823K. The result shows that reaction rate increased significantly with the increasing of temperature and H2O concentration; the reaction mechanism for ZrNi5 can be described by the first-order chemical reaction, and the reaction is first order for H2O concentration. The reaction activation energy of ZrNi5 is 55.8kJ/mol calculated from the Arrhenius equation.

Isotopic Exchange Between Hydrogen and Water Vapor over Supported Metal Catalysts. Part I. Kinetics of the Exchange

1972 ◽  
Vol 50 (12) ◽  
pp. 1900-1906 ◽  
Author(s):  
J. H. Rolston ◽  
J. W. Goodale
Keyword(s):  
Water Vapor ◽  
Transfer Rate ◽  
Water Vapor Pressure ◽  
Adsorbed Water ◽  
Deuterium Atom ◽  
Supported Metal Catalysts ◽  
Vapor Pressures ◽  
Order Dependence ◽  
Rate Limiting ◽  
Kinetics Of

Some rate data for the transfer of a deuterium atom tracer between hydrogen and water vapor, catalyzed by platinum supported on γ-alumina, are reported. Above 100 °C the transfer rate measured at 1 atm total pressure is shown to be free of mass transfer effects, and obeys an initial first order dependence on water vapor for vapor pressures less than 10 Torr. A near zero order dependence is observed at higher water vapor pressures. At temperatures below 100 °C the transfer rate is essentially independent of water vapor pressure between 5 and 100 Torr suggesting that surface adsorbed water is involved in the rate limiting transfer step.

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