Abstract
Uniform spherical Co-B amorphous alloy nanoparticles were prepared by ultrasound-assisted reduction of Co(NH 3) 2+ 6 with BH − 4 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 Co 2+ with BH − 4. 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 on Co active sites was more favorable for C O hydrogenation in comparison with the C C hydrogenation.
Published Version
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