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International Journal of Chemical Reactor Engineering

Ed. by de Lasa, Hugo / Xu, Charles Chunbao

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1542-6580
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Activity and Selectivity of Novel Structured Pd-Catalysts: Kinetics Modeling of Vegetable Oils Hydrogenation

Khaled Belkacemi / Amira Boulmerka / Safia Hamoudi / Joseph Arul
Published Online: 2006-01-12 | DOI: https://doi.org/10.2202/1542-6580.1245

Hydrogenation of sunflower oil over novel structured catalysts with pore size ranging from 3 to 20 nm, BET-specific surface area of 710-1200 m²/g, and catalyst metal loadings ranging from 0.7 to 5.0 % w/w, was investigated and compared to a commercial Ni-catalyst. The activity and selectivity of the catalysts as well as profiles of the reaction products such as trans fatty acids (TFA) of the hydrogenated oils were investigated. Surface characteristics of the support and the metal loading significantly affected the activity and selectivity of the Pd-catalysts. Catalyst supports with the pore diameter between 7-8 nm were more active than supports with lower pore diameters. The activity and selectivity of hydrogenation depended on Pd content, with maxima in the concentration range of 0.8 to 1.2 % w/w.The catalyst with Pd-loading of 1% w/w, supported on structured silica material was active and selective for the hydrogenation of sunflower and canola oils under mild process conditions. For same iodine value (IV) reduction, this catalyst produced about the same level of TFA, but produced less stearic acid and was more selective towards cis monoenes formation than Ni-catalyst. More importantly, this catalyst produced a reduced level of stearic acid which causes waxy mouth feel of the hydrogenated fat at increased levels.The lumped kinetic model of the hydrogenation of vegetable oils over Pd as well as Ni catalysts was found useful in the prediction of the fate of reaction and product lumps and was statistically robust. The uncertainty and confidence joint regions were estimated using the Bootstrap “Monte Carlo” technique.

Keywords: Hydrogenation; Canola and sunflower oils; Trans fatty acids; Nanostructured support; Pd-catalyst; Activity; Selectivity; Lumped kinetics; Uncertainty; Bootstrap

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Published Online: 2006-01-12


Citation Information: International Journal of Chemical Reactor Engineering, Volume 3, Issue 1, ISSN (Online) 1542-6580, DOI: https://doi.org/10.2202/1542-6580.1245.

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