Hydrogen rate constants

In the experiments carried out, the rate of hydrogenation was first order with respect to [C=C] from 30 to 90% conversion. Pseudo first order rate constants (k ) were determined for experiments over a range of conditions in order to measure the effect of different reaction parameters. The maximum hydrogenation rate constant recorded in this study was an order of magnitude less than the rate of H2 mass transfer10 and so gas uptake measurement reflected the inherent chemically controlled kinetics of the system. 

Secondary olefin hydrogenation rate constant K Adsorption constant... 

However, other results indicate that the P/Al catalyst has very low activity for C —N or C —C bond breaking 74, 81). A detailed kinetics study by Jian and Prins 81) showed that phosphorus addition decreases the C—N bond cleavage (rate constants k[ and k) in the reaction networks Figs. 33a and 33b) and the subsequent alkene hydrogenation (rate constant k() reactions in piperidine and DHQ HDN (see Table XIV). On the other hand, the presence of phosphorus increases aromatic ring hydrogenation of OPA... 

Pseudo First-Order Hydrogenation Rate Constants for Three Monoaromatic Groups in Syncrude B over Sulfided Cobalt-Molybdenum and Nickel-Molybdenum and Syncrude A over Nickel-Tungsten... 

Transport coefficient substrate Transport coefficient hydrogen Rate constant... 

It should be borne in mind that in calculating the true activation energy from hydrogenation rate constants according to the Arrhenius formula it is necessary to be sure that the potential of the catalyst (AE) is the same at the various temperatures. If this is not so, the difference in the potentials makes it possible to determine the preexponential term directly. 

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