Add time:07/18/2019         Source:sciencedirect.com

Catalytic hydrogenation of (2E,4E)-hexadienol over Pt, Pd, Rh, Ru and Ni supported on active carbon and γ-alumina has been studied. In all the reactions, diverse isomers of alkenic hexenols were primarily produced, which further hydrogenated to hexanol. Various hexenals were identified in the reaction mixture as well as hexanal, hexenes and hexane. The composition of the reaction mixture depended foremost upon the type of a catalyst used and was independent on the hydrogen pressure and catalyst weight. A great number of intermediates and products was produced over palladium, platinum and rhodium catalysts. These catalysts were not selective due to desired intermediates' production. Over ruthenium catalyst, (3E)-hexenol and (2E)-hexenol were produced in higher concentrations compared to the rest of the intermediate products, and the least quantity of hexene and hexane were also produced. Regarding the production of various hexenols, the most selective catalyst was Raney nickel. When Ni/Al2O3 catalyst was used, hexenols were produced in higher concentrations, but the selectivity was not higher than with Raney nickel.

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