纳米镍的制备及氢化大豆油的分析

以液相还原法制备纳米镍催化剂,并通过X-射线衍射、扫描电子显微镜、粒径分析及N_2吸附脱附等手段对催化剂进行表征。结果表明:纳米镍催化剂比表面积为42.35 m~2/g,平均粒径为30.0 nm,孔容为0.029 cm~3/g,表面附着表面活性剂使其成球性和分散性较好,有利于催化剂活性的提高。纳米镍氢化一级大豆油的活性是雷尼镍的2.01倍,当氢化油脂碘值约为90 g I/100 g时,纳米镍催化剂的亚油酸选择性为0.51,反式脂肪酸异构化的选择性为0.35,氢化油脂的反式脂肪酸相对含量较雷尼镍的低10.79%。

Preparation and Application of Nano Nickel Catalyst for Hydrogenation of Soybean Oil

Nano-sized nickel catalyst was prepared by the liquid phase reduction method and characterized by X-ray diffraction, scanning electron microscopy, particle size analysis and N2 adsorption-desorption isotherms. The results indicated that the specific surface area of the catalyst was 42.35 m2/g, the average particle size was 30.0 nm, and the entrance capacity was 0.029 cm3/g. The surfactant adhering to the catalyst surface endowed it with good sphericity and dispersivity, being beneficial to improve its activity. Nano nickel was 2.01 times more active in hydrogenating first-grade soybean oil than raney nickel. When the iodine value of hydrogenated oil was about 90 g I/100 g, the selectivity of nano nickel catalyst was 0.51 for linoleic acid and 0.35 for trans fatty acids isomerization, and the trans fatty acid content of the hydrogenated oil was decreased by 10.79% compared with that hydrogenated with raney nickel.