Alicyclic hydrocarbons dehydrogenation

This explains why, at equal conversions and propane concentrations, the propene fraction on Ga-silicate is much lower than on Pt/Ga-silicate. This route of arene formation is catalyzed by acidic centers and it competes with cracking. At higher temperatures, gallium became more active in alicyclic hydrocarbon dehydrogenation [7,8] and selectivities for the both catalysts became similar. 

Aromatization the conversion of nonaromatic hydrocarbons to aromatic hydrocarbons by (1) rearrangement of aliphatic (noncyclic) hydrocarbons (q.v.) into aromatic ring structures and (2) dehydrogenation of alicyclic hydrocarbons (naphthenes). 

Pd is used for the dehydrogenation of alicyclic hydrocarbons to fully or partically aromatic hydrocarbons... 

Dehydrogenation (the conversion of alicyclic or hydroaromatic compounds into their aromatic counterparts by removal of hydrogen and also, in some cases, of other atoms or groups) finds wide application in the determination of structure of natural products of complex hydroaromatic structure. Dehydrogenation is employed also for the synthesis of polycyclic hydrocarbons and their derivatives from the readily accessible synthetic hydroaromatio compounds. A very simple example is the formation of p-methylnaphthalene from a-tetra-lone (which is itself prepared from benzene—see Section IV, 143) ... 

The dehydrogenation of alicyclic 6-membered rings to aromatic hydrocarbons is discussed elsewhere (method 2). When a carbonyl group is... 

A constant and recurrent theme in the study of metal-catalysed hydrocarbon transformations has been the complicating role of carbonaceous deposits, which are recognised as forms of the reactants that are dehydrogenated and form multiple bonds to the surface to an extent depending critically on temperature and hydrogen pressure. Analysis of the behaviour of alkanes and alicyclics has led to the conclusion that such species are inimical to the reactions of the latter, but are that the former may still be reactive in their presence and may even require their participation. This of course is not a new idea, but it still needs quantitative evaluation. 

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