Co-B/SBA-15非晶态催化剂应用于肉桂醛选择性加氢的研究

以介孔材料SBA-15作为载体,采用浸渍法制备Co-B/SBA-15非晶态催化剂,该样品仍然保持SBA-15特有的有序规整孔道结构,Co-B非晶态合金颗粒均匀分布在孔道内壁,采用普通SiO2载体制备的Co-B/ SiO2,Co-B颗粒主要分布在外表面.在肉桂醛选择性加氢制肉桂醇中,Co-B/SBA-15的催化活性和对肉桂醇的最佳得率显著高于Co-B/SiO2,主要归因于活性位的高分散,规整的孔道结构,以及独特的活性位团簇结构和电子态.

Study on the Selective Hydrogenation of Cinnamaldehyde over the Co-B/SBA-15 Amorphous Catalyst

A supported Co-B amorphous alloy catalyst with mesoporous structure was prepared by impregnating the SBA-15 support with aqueous CoCl2 solution,followed by reduction with KBH4 solution.Unlike the Co-B/SiO2 in which most Co-B alloy particles were dispersed on the outer surface,the Co-B particles in the Co-B/SBA-15 catalyst were mainly distributed homogeneously in the channels of the SBA-15 support.During liquid phase cinnamaldehyde (CMA) hydrogenation,the as-prepared Co-B/SBA-15 exhibited much higher activity and yield toward cinnamyl alcohol (CMO) than the conventional Co-B/SiO2,possibly owing to the high and homogeneous distribution of Co active sites on the support,and the regular and well-ordered large size pore channels which favored the diffusion and adsorption of CMA molecules.Perhaps,the difference in nature of the active centers of these two catalysts,such as the cluster structure and the electronic state of the active sites should also be considered in order to explain their different catalytic behaviors.