Selective Hydrogenation Of Cinnamaldehyde To Cinnamyl Alcohol Over Modified Amorphous Co-B Alloy Catalyst

Amorphous Co-B alloy catalysts were prepared by chemical reduction with KBH4 in aqueous solution, and modified amorphous Co-B alloy catalyst by introducing the third metal component were prepared by chemical reduction of mixed CoCl₂ and MCl_n (M: introduced metal) with KBH4 in aqueous solution. The effect of different mole ratio of B/Co and the effect of Fe, Cu, La, Ce, Mo, Ni and Zn to the property of hydrogenation of amorphous Co-B catalyst were investigated. The catalysts were also charactered by XRD, DSC, TPR, H₂-TPD and XPS. The results showed that when the mole ratio of B/Co was 3-4, the activity of Co-B catalyst has little difference on the hydrogenation of cinnamaldehyde (CMA), thus was determined the optimum B/Co. Fe, La, Ce, and Zn had promoted effect to amorphous Co-B catalyst, among them Zn was the best. At the reaction condition of 413K temperature and 2.5Mpa H₂ pressure, the highest yield of cinnamyl alcohol (CMO) reached 84.0% after 3 hours reaction over the 1% Zn-content(x_Zn=1%) amorphous Co-B catalyst, which increased 15.5% in selectivity and 15.0% in yield of CMO than no modified amorphous Co-B catalyst. Cu, Mo and Ni had adverse effect to the hydrogenation performance of CMA of amorphous Co-B catalyst. Amorphous...