Citation:
Ning Li, Sensen Shang, Lianyue Wang, Jingyang Niu, Ying Lv, Shuang Gao. Superior performance of Co-N/m-C for direct oxidation of alcohols to esters under air[J]. Chinese Journal of Catalysis,
;2018, 39(7): 1249-1257.
doi:
10.1016/S1872-2067(18)63058-X
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A convenient, expeditious, and high-efficiency protocol for the transformation of alcohols into esters using a Co-modified N-doped mesoporous carbon material (Co-N/m-C) as the catalyst is proposed. The catalyst was prepared through direct pyrolysis of a macromolecular precursor. The catalyst prepared using a pyrolysis temperature of 900℃ (labeled Co-N/m-C-900) exhibited the best performance. The strong coordination between the ultra-dispersed cobalt species and the pyridine nitrogen as well as the large area of the mesoporous surface resulted in a high turnover frequency value (107.6 mol methyl benzoate mol-1 Co h-1) for the direct aerobic oxidation of benzyl alcohol to methyl benzoate. This value is much higher than those of state-of-the-art transition-metal-based nanocatalysts reported in the literature. Moreover, the catalyst exhibited general applicability to various structurally diverse alcohols, including benzylic, allylic, and heterocyclic alcohols, achieving the target esters in high yields. In addition, a preliminary evaluation revealed that Co-N/m-C-900 can be used six times without significant activity loss. In general, the process was rapid, simple, and cost-effective.
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Keywords:
- Cobalt,
- N-doped,
- Mesoporous carbon,
- Esters,
- Catalysis
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