Selective hydrogenation of oleic acid to 9-octadecen-1-ol: Catalyst preparation and optimum reaction conditions |
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Authors: | K Y Cheah T S Tang Fujio Mizukami Shu-ichi Niwa Makoto Toba Y M Choo |
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Affiliation: | (1) Palm Oil Research Institute of Malaysia, 50720 Kuala Lumpur, Malaysia;(2) National Chemical Laboratory for Industry, Higashi, Tsukuba, 305 Ibaraki, Japan |
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Abstract: | A new catalyst, ruthenium-tin-alumina is found to selectively hydrogenate oleic acid to 9-octadecen-1-ol (oleyl + elaidyl
alcohol) at low pressure with high yield. Catalyst preparation methods, catalyst raw materials and activation conditions have
a significant effect on the activity of the catalyst. The optimum atomic ratio of ruthenium to tin is about 1:2. Catalyst
prepared by an improved sol-gel method shows higher activity and selectivity than catalysts prepared by impregnation and coprecipitation
methods. Chloride is found to have a negative effect on catalytic activity. The best catalyst is prepared from chloride-free
ruthenium and tin raw materials. Under the optimum reaction conditions of 250°C and 5.6 MPa, the selectivities for 9-octadecen-1-ol
and total alcohol (9-octadecen-1-ol + stearyl alcohol) formation are 80.9% and 97%, respectively, at a conversion of 81.3%. |
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Keywords: | 9-Octadecen-1-ol oleic acid ruthenium-tin-alumina catalyst selective hydrogenation sol-gel method |
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