Catalytic behaviour of carbon supported platinum group metals in the hydrogenation and isomerization of methyl oleate

Kinetic peculiarities of cis methyl oleate hydrogenation over Pd/C, Ru/C, Rh/C, Pt/C and Ir/C were studied. Liquid phase hydrogenation was carried out at temperature 298 ≤ T ≤ 373 K and under hydrogen pressure within 1–10 bar using n-octane as a solvent. GLC and FTIR techniques were employed to characterize the reaction products. The effects of the catalyst amount, cis methyl oleate concentration, reaction temperature, and hydrogen pressure on the rates of methyl oleate hydrogenation and cis-trans isomerization were investigated. A simple reaction scheme involving cis methyl oleate hydrogenation and cis-trans isomerization was proposed for kinetic modeling. A good agreement was obtained between the calculated kinetic curves and the experimental data for the isomerization and hydrogenation of methyl oleate. It was shown that the second-row metals (Ru, Rh, Pd) display high activity in isomerization whereas the third-row metals (Ir, Pt) exhibit minor activity.

Kinetic peculiarities of cis and trans methyl oleate transformation in the course of cis methyl oleate hydrogenation over Pd/C, Ru/C, Rh/C, Pt/C and Ir/C catalysts were investigated. Among the studied catalysts based on group 8 metals the highest catalytic activity in the cis methyl oleate hydrogenation with minor methyl elaidate formation is revealed over Pt catalyst.Figure optionsDownload as PowerPoint slide