Highly Dispersed Pd on Co鈥揃 Amorphous Alloy: Facile Synthesis via Galvanic Replacement Reaction and Synergetic Effect between Pd and Co

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• 作者：Jinqiang Ma ; Liang Xu ; Lei Xu ; Hao Wang ; Sen Xu ; Hexing Li ; Songhai Xie ; Hui Li
• 刊名：ACS Catalysis
• 出版年：2013
• 出版时间：May 3, 2013
• 年：2013
• 卷：3
• 期：5
• 页码：985-992
• 全文大小：574K
• 年卷期：v.3,no.5(May 3, 2013)
• ISSN：2155-5435

文摘

In this paper, uniform Co鈥揃 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鈥揃 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鈥揃 catalysts exhibited extremely active and more selectivity to 2-ethyl-1-hexanol than the monometallic Pd and Co鈥揃 amorphous alloy, showing potential application in industry. The enhanced performances could be attributed to the highly dispersed Pd on the surface of Co鈥揃 prepared by GRR and the synergetic effect between Pd and Co.

Keywords:

Pd/Co鈭払; bimetallic catalyst; galvanic replacement reaction; hydrogenation; 2-ethyl-2-hexenaldehyde; 2-ethyl-1-hexanol