Abstract
Monitoring hydrogen consumption has allowed studying the progress of the liquid phase hydrogenation of cyclohexene in toluene with Rh SILP (supported ionic liquid phase) catalysts prepared by the immobilization of the [{RhCl(cod)}2] complex on different carbon materials. An excess of hydrogen consumption with respect to the required amount for cyclohexene hydrogenation was registered and related with the solvent (toluene) hydrogenation. The study carried out led to unraveling the extent of toluene hydrogenation and to determining if the rate of this reaction is affected by the properties of the carbon material used as support. The results revealed that the Rh SILP catalysts we prepared showed acceptable toluene conversion, with 100% selectivity to the total hydrogenated product, and that the effect of the carbon support is the same as for cyclohexene hydrogenation.
Highlights
Toluene is a solvent commonly used in several catalytic processes
It can be observed that the hydrogen consumption steadily increases in both cases
Following theprogress progress of hydrogenation the hydrogenation of cyclohexene hydrogen has allowed unraveling the fact that catalysts are able to hydrogenate toluene in liquid phase
Summary
The potentially occurring minor process of solvent hydrogenation remains often unobserved, and it is not taken into account, it could affect the processes efficiencies. Most studies dealing with hydrogenation reactions in toluene, among them those indicated above [1,2,3,4,5,6,7], do not mention the possibility of toluene hydrogenation. This is, likely, because the relatively mild reaction conditions used allow considering negligible the hydrogenation of an aromatic compound, and toluene as it is much more difficult to hydrogenate than other aromatics, such as naphthalene [8]
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