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http://dx.doi.org/10.14478/ace.2017.1023

Effect of Oxidation-reduction Pretreatment for the Hydrogenation of Caster Oil over Ni/SiO2 Catalyst  

Choi, Yi Sun (Department of Chemical Engineering, Hankyong National University)
Kim, Soo Young (Department of Chemical Engineering, Hankyong National University)
Koh, Hyoung Lim (Department of Chemical Engineering, Hankyong National University)
Publication Information
Applied Chemistry for Engineering / v.28, no.3, 2017 , pp. 326-331 More about this Journal
Abstract
Castor oil can be used as a useful raw material for chemical industries such as intermediates of surfactants through hydrogenation reaction. In this study, effects of the preparation method and pretreatment condition on the nickel catalyst for the hydrogenation of castor oil were investigated. The nickel catalyst was supported on the silica carrier by the precipitation method with different Ni contents, solution pH values, and precipitants. Repeated pretreatments of oxidation and reduction cycles were then carried out. The activity of the nickel catalyst was measured by comparing the iodine value of the castor oil. The dispersion of nickel on the catalyst was analyzed by X-ray diffraction (XRD), $N_2$ adsorption-desorption, and transmission electron microscopy (TEM). The activity of nickel catalyst was also compared by CO oxidation experiments. The redispersion of nickel occurred on the silica by repeated oxidation and reduction cycles, and this effect contributed to promoting the castor oil hydrogenation activity.
Keywords
hydrogenation; Ni catalyst; castor oil; oxidation-reduction treatment; dispersion;
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