Polymer of Intrinsic Microporosity Induces Host-Guest Substrate Selectivity in Heterogeneous 4-Benzoyloxy-TEMPO-Catalysed Alcohol Oxidations

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• 作者：Sunyhik D. Ahn ; Adam Kolodziej ; Richard Malpass-Evans ; Mariolino Carta…
• 关键词：Carbon microspheres ; Membrane ; Fuel cell ; Biofuel ; Mesoporosity ; Voltammetry
• 刊名：Electrocatalysis
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：7
• 期：1
• 页码：70-78
• 全文大小：1,607 KB
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• 作者单位：Sunyhik D. Ahn (1)
  Adam Kolodziej (1)
  Richard Malpass-Evans (2)
  Mariolino Carta (2)
  Neil B. McKeown (2)
  Stephen D. Bull (1)
  Antoine Buchard (1)
  Frank Marken (1)
  
  1. Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
  2. EaStCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Electrochemistry
  Physical Chemistry
  Energy Technology
  
• 出版者：Springer New York
• ISSN：1868-5994

文摘

The free radical 4-benzoyloxy-2,2,6,6-tetramethylpiperidine-1-oxyl (4B-TEMPO) is active as an electrocatalyst for primary alcohol oxidations when immobilised at an electrode surface and immersed into an aqueous carbonate buffer solution. In order to improve the catalytic process, a composite film electrode is developed based on (i) carbon microparticles of 2–12 μm diameter to enhance charge transport and (ii) a polymer of intrinsic microporosity (here PIM-EA-TB with a BET surface area of 1027 m2 g−1). The latter acts as a highly rigid molecular framework for the embedded free radical catalyst with simultaneous access to aqueous phase and substrate. The resulting mechanism for the oxidation of primary alcohols is shown to switch in reaction order from first to zeroth with increasing substrate concentration consistent with a kinetically limited process with competing diffusion of charge at the polymer layer-electrode interface (here the “LEk” case in Albery-Hillman notation). Reactivity optimisation and screening for a wider range of primary alcohols in conjunction with DFT-based relative reactivity correlation reveals substrate hydrophobicity as an important factor for enhancing catalytic currents. The PIM-EA-TB host matrix is proposed to control substrate partitioning and thereby catalyst reactivity and selectivity.