Abstract
In this paper, uniform Co–B amorphous alloy nanospheres with an average particle size of 50 nm were synthesized by chemical reduction of cobalt ion with borohydride in aqueous solution containing Bu4PBr and KCl. Then, Pd was introduced into this system by galvanic replacement reaction (GRR) between Co and Na2PdCl4. Pd/Co–B catalysts with different Pd content could be obtained via adjusting the amount of Na2PdCl4 in reaction mixture. The crystal structure, morphology, and surface electronic state of as-prepared catalysts were characterized by XRD, TEM, XPS, and H2-TPD. During the liquid-phase hydrogenation of 2-ethyl-2-hexenaldehyde, the as-prepared Pd/Co–B catalysts exhibited extremely active and more selectivity to 2-ethyl-1-hexanol than the monometallic Pd and Co–B amorphous alloy, showing potential application in industry. The enhanced performances could be attributed to the highly dispersed Pd on the surface of Co–B prepared by GRR and the synergetic effect between Pd and Co.
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