Kinetics of molecular hydrogen activation by cobaltrhodium heptacarbonyl

1990 ◽  
Vol 9 (6) ◽  
pp. 1943-1949 ◽  
Author(s):  
Marc Garland ◽  
Piero Pino
Keyword(s):  
Molecular Hydrogen ◽  
Hydrogen Activation ◽  
Kinetics Of

On the relationship between affinity for molecular hydrogen and the physiological directionality of hydrogenases

2005 ◽  
Vol 33 (1) ◽  
pp. 12-14 ◽  
Author(s):  
D.J. van Haaster ◽  
P.-L. Hagedoorn ◽  
J.A. Jongejan ◽  
W.R. Hagen
Keyword(s):  
Molecular Hydrogen ◽  
Pyrococcus Furiosus ◽  
Hydrogen Oxidation ◽  
Desulfovibrio Vulgaris ◽  
Proton Reduction ◽  
Hydrogen Activation ◽  
The Relationship ◽  
H2 Oxidation ◽  
Kinetics Of

The physiological significance of the generic reaction H2↔2[H] is not always clear because hydrogenases may function in the breakdown of molecular hydrogen or in its synthesis or in both directions. Fe-hydrogenases have nevertheless been most often associated with proton reduction and NiFe-hydrogenases with hydrogen oxidation. A re-determination of the KM of H2 oxidation by Pyrococcus furiosus NiFe-hydrogenase-I and by Desulfovibrio vulgaris Fe-hydrogenase suggests that affinity for hydrogen has been seriously underestimated and that the kinetics of hydrogen activation in relation to the directionality of hydrogenases should be re-evaluated.

scholarly journals Kinetics of D/H isotope fractionation between molecular hydrogen and water

2018 ◽  
Vol 242 ◽  
pp. 191-212 ◽  
Author(s):  
Nicholas J. Pester ◽  
Mark E. Conrad ◽  
Kevin G. Knauss ◽  
Donald J. DePaolo
Keyword(s):  
Molecular Hydrogen ◽  
Isotope Fractionation ◽  
Kinetics Of

The mercury (63P1) photosensitized hydrogenation of ethylene. Kinetics of the reaction C2H5 + H2 = C2H6 + H

1968 ◽  
Vol 46 (20) ◽  
pp. 3275-3281 ◽  
Author(s):  
L. E. Reid ◽  
D. J. Le Roy
Keyword(s):  
Gas Phase ◽  
Molecular Hydrogen ◽  
Mercury Vapor ◽  
Experimental Conditions ◽  
Working Pressure ◽  
Extinction Coefficients ◽  
Secondary Reactions ◽  
Ethyl Radicals ◽  
Kinetics Of ◽  
Hydrogenation Of Ethylene

A quantitative study has been made of the reaction of ethyl radicals with molecular hydrogen in the gas phase in the temperature range 240 to 320 °C. The mercury (63Pi) photosensitized decomposition of hydrogen in the presence of ethylene was used to generate ethyl radicals. Extinction coefficients for the absorption of 2537 Å by mercury vapor were measured and Beer's law was shown to be obeyed under the experimental conditions used. The corrections required to allow for the nonuniformity of radical concentrations in the cell were small. After delineating the experimental conditions necessary to minimize secondary reactions, the rate constant (cm3 mole−1 s−1) for the reaction C2H5 + H2 = C2H6 + H was found to be given by log10k = 12.57 − 13.7/θ. Experiments in the presence of added carbon dioxide showed the absence of hot radical effects at the working pressure of 92 Torr of hydrogen.

CATALYTIC ACTIVATION OF HYDROGEN IN AQUEOUS SOLUTION BY THE CHLOROPALLADATE(II) ION

1959 ◽  
Vol 37 (9) ◽  
pp. 1446-1450 ◽  
Author(s):  
J. Halpern ◽  
J. F. Harrod ◽  
P. E. Potter
Keyword(s):  
Aqueous Solution ◽  
Ferric Chloride ◽  
Molecular Hydrogen ◽  
Homogeneous Catalyst ◽  
Rate Law ◽  
Catalytic Activation ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

The kinetics of the reduction of ferric chloride by molecular hydrogen in aqueous solution, in the presence of chloropalladate(II), were examined. The latter acts as a homogeneous catalyst for the reaction. The rate-law was found to be,[Formula: see text]where[Formula: see text]The mechanism of the reaction is discussed.

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