Self-Supported PdxBi Catalysts for the Electrooxidation of Glycerol in Alkaline Media

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• 作者：Anna Zalineeva ; Alexey Serov ; Monica Padilla ; Ulises Martinez ; Kateryna Artyushkova ; St猫ve Baranton ; Christophe Coutanceau ; Plamen B. Atanassov
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：March 12, 2014
• 年：2014
• 卷：136
• 期：10
• 页码：3937-3945
• 全文大小：530K
• 年卷期：v.136,no.10(March 12, 2014)
• ISSN：1520-5126

文摘

Highly active self-supported Pd_xBi catalysts are synthesized by the sacrificial support method. Self-supported Pd_xBi catalysts have a porous nanostructured morphology with high surface areas (in the range from 75 to 100 m² g^鈥?), making Pd_xBi a state-of-the-art catalyst. Pd₄Bi displays the highest activity toward glycerol oxidation. In situ Fourier transform infrared spectroscopy highlights the unique catalytic behavior of self-supported Pd_xBi materials due to their particular structure and morphology. The confinement of reactants and intermediates in pores acting as nanoreactors is responsible for the high selectivity as a function of the electrode potential: aldehyde and ketone at low potentials, hydroxypyruvate at moderate potentials, and CO₂ at high potentials. Moreover, the selectivity depends on the electrode history: it is different for the positive potential scan direction than for the reverse direction, where the catalyst becomes selective toward the production of carboxylates.