Platinum-Modulated Cobalt Nanocatalysts for Low-Temperature Aqueous-Phase Fischer鈥揟ropsch Synthesis

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• 作者：Hang Wang ; Wu Zhou ; Jin-Xun Liu ; Rui Si ; Geng Sun ; Meng-Qi Zhong ; Hai-Yan Su ; Hua-Bo Zhao ; Jose A. Rodriguez ; Stephen J. Pennycook ; Juan-Carlos Idrobo ; Wei-Xue Li ; Yuan Kou ; Ding Ma
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：March 13, 2013
• 年：2013
• 卷：135
• 期：10
• 页码：4149-4158
• 全文大小：531K
• 年卷期：v.135,no.10(March 13, 2013)
• ISSN：1520-5126

文摘

Fischer鈥揟ropsch synthesis (FTS) is an important catalytic process for liquid fuel generation, which converts coal/shale gas/biomass-derived syngas (a mixture of CO and H₂) to oil. While FTS is thermodynamically favored at low temperature, it is desirable to develop a new catalytic system that could allow working at a relatively low reaction temperature. In this article, we present a one-step hydrogenation鈥搑eduction route for the synthesis of Pt鈥揅o nanoparticles (NPs) which were found to be excellent catalysts for aqueous-phase FTS at 433 K. Coupling with atomic-resolution scanning transmission electron microscopy (STEM) and theoretical calculations, the outstanding activity is rationalized by the formation of Co overlayer structures on Pt NPs or Pt鈥揅o alloy NPs. The improved energetics and kinetics from the change of the transition states imposed by the lattice mismatch between the two metals are concluded to be the key factors responsible for the dramatically improved FTS performance.