INDEX hydrogen chemisorption

All the samples were also characterized by hydrogen chemisorption, performed following a particular procedure to determine the metal dispersion (dispersion index, ID%) [9, 10]. 

In this paper, we propose to present a theoretical study of the catalytic hydrogenation of ethylene in order to compare the catalytic power of various transition metals. As a basic hypothesis, we have taken the fact that the ethylene molecule attaches itself to the metallic surface and this increases its reactivity. This is the same hypothesis as that of Coulson and Longuet-Higgins82 and Daudel and Sandorfy.38 These workers calculated the variation of the index of free valence. We have considered it more interesting to endeavour to calculate the electronic potential barrier. We have used the system of reaction levels as shown in Fig. 1, where V is the potential barrier in the absence of catalyst, Q the heat of chemisorption, and U the potential barrier in passing... 

Simple linear relationships developed between the quantum chemical indexes of organic molecules (their maximum charges and energies of the frontier orbitals) and their empirical donor acceptor parameters as well as the heats of the hydrogen-bonded complexes formation with silica surface OH groups or the chemisorption activation energies on this surface may be used for estimation of the complexes stability and reactivity of organic compounds towards Bronsted sites of other oxide surfaces. The electron donor ability of... 

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