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Rational design of carbon support to prepare ultrafine iron oxide catalysts for air oxidation of alcohols

机译:碳支持的合理设计以制备超铁氧化铁催化剂,以使醇的空气氧化

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摘要

A kind of mesoporous carbon support with abundant surface functional groups and a tunable pore size was prepared using a modified hard-template route. This carbon support was demonstrated to be efficient for fabricating ultrafine iron oxide catalysts, and the resultant catalysts exhibit an obviously higher activity in air oxidation of several benzyl alcohols compared with the catalysts with other synthetic carbon as supports. The concrete role of carbon support in the catalyst design was investigated in detail. The negatively charged surface oxygen functional groups serve as strongly active sites for anchoring positively charged Fe3+ ions and lead to high dispersion of iron oxide species. These oxygen functional groups also provide a suitable coordinate environment to increase the electron density of iron centres and form efficient active sites for the oxidation of benzyl alcohols with molecular oxygen.
机译:使用改良的硬板途径制备了一种具有丰富的表面官能团和可调孔径的介孔碳支持。 证明该碳载体对于制造超细氧化铁催化剂是有效的,并且与具有其他合成碳作为支撑的催化剂相比,最终的催化剂在几种苄醇的空气氧化中表现出明显更高的活性。 详细研究了碳支持在催化剂设计中的具体作用。 带负电荷的表面氧官能团充当固定带正电的Fe3+离子并导致氧化铁物种的高分散的强度活性位点。 这些氧官能团还提供了合适的坐标环境,以增加铁中心的电子密度,并形成有效的活性位点,以用分子氧氧化苄醇。

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