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Vol. 27 No. 2 (2015): Vol 27 Issue 2

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Performance of Pd-B/SiO2 Catalyst in Hydrogenation of Sunflower Oil

https://doi.org/10.14233/ajchem.2015.17096
A. Alshaibani
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bandar Baru Bangi 43650, Malaysia
Z. Yaakob
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bandar Baru Bangi 43650, Malaysia

Corresponding Author(s) : A. Alshaibani

majeedsh70@yahoo.com

Asian Journal of Chemistry, Vol. 27 No. 2 (2015): Vol 27 Issue 2

Abstract

An investigation study for conversion and trans-isomerization selectivity of sunflower oil hydrogenation on Pd/SiO2 and Pd-B/SiO2 catalysts was performed. The Pd/SiO2 catalyst was prepared by wet impregnation, then a chemical reduction was performed on Pd/SiO2 to produce Pd-B/SiO2 catalyst. Both catalysts were characterized by Brunauer-Emmett-Teller surface area analysis, X-ray powder diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and transmission electron microscopy. The chemically reduced palladium catalyst (Pd-B/SiO2) showed different properties than Pd/SiO2 catalyst. Hydrogenation of sunflower oil was performed on both Pd/SiO2 and Pd-B/SiO2 catalysts at 383 K, hydrogen pressure of 500 kPa and agitation of 1450 rpm for 1 h. The Pd-B/SiO2 catalyst exhibited distinctive behaviour in terms of conversion and trans-isomerization selectivity. It achieved around a 12.8 % higher conversion and a 35 % lower tendency to form trans-fatty acids than Pd/SiO2. Furthermore, Pd-B/SiO2 exhibited higher overall activity than the Escat 1351 commercial catalyst and some other reported palladium catalysts. The chemical reduction for Pd/SiO2 catalyst enhances the catalyst activity and trans-isomerization selectivity. The chemical reduction of palladium supported catalyst using potassium borohydride has a noticeable effects on the catalyst morphology, conversion and tendency to form trans-fatty acids.

Keywords

Conversion trans-Isomerization selectivity Overall catalyst activity
Alshaibani, A., & Yaakob, Z. (2015). Performance of Pd-B/SiO2 Catalyst in Hydrogenation of Sunflower Oil. Asian Journal of Chemistry, 27(2), 630–634. https://doi.org/10.14233/ajchem.2015.17096
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