Aerobic Oxidation of Fluorene to Fluorenone over Copper-Doped Co3O4 with a High Specific Surface Area,ACS Sustainable Chemistry & Engineering

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Aerobic Oxidation of Fluorene to Fluorenone over Copper-Doped Co3O4 with a High Specific Surface Area
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-02-05 , DOI: 10.1021/acssuschemeng.9b07480
Jing Luo _{1,

2} , Yanxia Wang _{1,

2} , Feng Wang ₁ , Feng Li ₁ , Lei Li ₁ , Ning Zhao ₁ , Fukui Xiao ₁

Affiliation

Copper-doped Co₃O₄ with a high specific surface area has been prepared by using mesoporous silica KIT-6 as a hard template, which showed exceptional catalytic performance (99% conversion of fluorene and 99% selectivity of fluorenone) for catalytic oxidation of fluorene to fluorenone using molecular oxygen as the oxidant in the absence of a radical initiator or other cocatalysts. Characterization results of N₂ adsorption–desorption, X-ray diffraction, and transmission electron microscopy of the samples revealed the ordered mesoporous structure and increased specific surface area. X-ray photoelectron spectroscopy and O₂ temperature-programmed desorption results showed the increased surface cobalt, Co³⁺/Co²⁺ ratio, and oxygen species. The H₂ temperature-programmed reduction also indicated that the redox ability could be improved by doped copper in Co₃O₄, which all facilitated the aerobic oxidation reaction.

中文翻译：

高比表面积的铜掺杂Co ₃ O ₄上芴的有氧氧化为芴酮

通过使用介孔二氧化硅KIT-6作为硬模板制备具有高比表面积的掺铜Co ₃ O ₄，该催化剂显示出优异的催化性能（芴的99％转化率和芴酮的99％选择性）。在没有自由基引发剂或其他助催化剂的情况下，使用分子氧作为氧化剂将芴转化为芴酮。样品的N ₂吸附-解吸，X射线衍射和透射电子显微镜的表征结果表明，有序的介孔结构和比表面积增加。X射线光电子能谱和O _2程序升温脱附结果表明表面钴Co ³⁺ / Co的增加²⁺比例和氧气种类。H _2程序升温还原还表明，通过在Co ₃ O _4中掺杂铜可以提高氧化还原能力，所有这些都促进了好氧氧化反应。

更新日期：2020-02-06

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