Sunflower oil hydrogenation on Pt catalysts: Comparison between conventional process and homogeneous phase operation using supercritical propane
The hydrogenation of sunflower oil on TiO 2 supported by Pt catalysts was studied. The Pt/TiO 2 catalyst was modified: (a) with K and (b) by high temperature reduction treatment, in order to observe its influence on the activity and the cis-isomers selectivity. The catalysts were characterized by at...
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Published in | Catalysis today Vol. 133; pp. 836 - 841 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.04.2008
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Subjects | |
Online Access | Get full text |
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Summary: | The hydrogenation of sunflower oil on TiO
2 supported by Pt catalysts was studied. The Pt/TiO
2 catalyst was modified: (a) with K and (b) by high temperature reduction treatment, in order to observe its influence on the activity and the
cis-isomers selectivity. The catalysts were characterized by atomic absorption, H
2 chemisorption, TPR and XRD.
The hydrogenation of edible oils at conventional conditions is diffusion controlled. The addition of propane as supercritical (SC) solvent allows to perform the reaction in a homogeneous phase in contact with the solid catalyst. A significant increase in the reaction rate of the homogeneous system was observed. Regarding selectivity, the formation of
trans-isomers was higher in the reaction under conventional conditions, whereas the production of saturated compound was favored in the homogeneous operation. Pt-K/TiO
2 and Pt/TiO
2 catalyst presented a similar TON, although the
cis-isomer selectivity increased with the alkali addition. This behavior is explained in terms of a chemical modification of the noble metal. |
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ISSN: | 0920-5861 1873-4308 |
DOI: | 10.1016/j.cattod.2007.11.036 |