Catalytic Hydrogenation of Pentanoic Acid over VIII Group Metals

Liquid phase pentanoic acid hydrogenation in nonpolar hydrocarbon solutions (180 °C, 25 bar) was studied over rhenium on titanium oxide catalysts modiёed also with group VIII metals – platinum, palladium, ruthenium and rhodium. It was shown that during hydrogenation pentanoic acid was converted into pentanol followed by esteriёcation with unreacted pentanoic acid into its pentyl ester, resulting in an equilibrium mixture of pentanoic acid – pentanol – pentyl pentanoate. Conversion of pentanoic acid increased in the row PdRe/TiO2 <RuRe/TiO2 <RhRe/TiO2 <ReOx/TiO2 < PtRe/TiO2. Selectivity to pentanol was elevated over bimetallic catalysts in the sequence RhRe/TiO2 ~ PtRe/TiO2 <PdRe/TiO2 ~ RuRe/TiO2 and was signiёcantly different from ReOx/TiO2. The highest selectivity to pentanol was observed over ReOx, supported on the thermally modiёed titanium oxide while Re over unmodiёed titania was completely inactive under the same reaction conditions.

• Sergey A.
• Anton Yu.
• Mikhail N.
• Simakova IrinaL.
• Yuliya S.

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