Ultrasound-assisted preparation of a highly active and selective Co-B amorphous alloy catalyst in uniform spherical nanoparticles

作者：Li, Hexing^*; Li, Hui; Zhang, Jing; Dai, Weilin; Qiao, Minghua

来源：Journal of Catalysis, 2007, 246(2): 301-307.

DOI：10.1016/j.jcat.2006.12.014

• sonochemical preparation
• Co-B amorphous alloy catalyst
• uniform particles
• cinnamaldehyde
• hydrogenation
• cinnamyl alcohol

Uniform spherical Co-B amorphous alloy nanoparticles were prepared by ultrasound-assisted reduction of Co(NH3)(6)(2+) with BH4- in aqueous solution, and the particle size was adjusted by changing either the ultrasound power or the ultrasonication time. During liquid-phase cinnamaldehyde (CMA) hydrogenation, the as-prepared Co-B catalyst exhibited much higher activity and better selectivity to cinnamyl alcohol (CMO) than the regular Co-B obtained by direct reduction of Co2+ with BH4-. The higher activity can be attributed to both the higher dispersion of Co active sites (S-Co) and the higher intrinsic activity (R-S). The higher selectivity can be attributed to both the uniform Co-B amorphous alloy particles and the strong electronic interaction between Co and B, which enhances the competitive adsorption of C=O group against C=C group in the CMA molecule. Meanwhile, the stronger adsorption for hydrogen oil Co active sites was more favorable for C=O hydrogenation in comparison with the C=C hydrogenation.

• 出版日期2007-3-10
• 单位复旦大学; 上海师范大学