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The modes of formation of carbonaceous deposits (''coke'') during the transformation of organic compounds over acid and over bifunctional noble metal-acid catalysts are described. At low reaction temperatures, (<200 o C) ''coke'' formation involves mainly condensation and rearrangement steps. Therefore, the deposits are not polyaromatic and their composition depends very much on the reactant...
The kinetic modelling of propane aromatization over a Ga/HMFI catalyst and the comparison of Ga 2 O 3 -HMFI mixtures with different compositions has allowed us to specify the respective roles of dehydrogenating species and of protonic sites. Propane aromatization over Ga/HMFI catalyst occurs mainly through a conventional bifunctional reaction scheme (with desorbed intermediates) in...
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