Journal
CATALYSIS LETTERS
Volume 151, Issue 4, Pages 1013-1024Publisher
SPRINGER
DOI: 10.1007/s10562-020-03374-x
Keywords
N-doped carbon nanofibers; Electrospinning; Synergistic effect; Phenol hydrogenation; Cyclohexanone
Categories
Funding
- National Natural Science Foundation [21776127, 21921006]
- National Key RD Program [2016YFB0301503]
- Jiangsu Province Key RD Program [BE2018009-2]
- priority academic program development of Jiangsu higher education institutions (PAPD)
- State Key Laboratory of Materials-Oriented Chemical Engineering [ZK201902]
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One-dimensional N-doped carbon nanofibers were successfully fabricated by electrospinning for synthesizing Pd@N-CNFs catalysts, which exhibited excellent performance in the selective hydrogenation of phenol to cyclohexanone. The Pd@N-CNFs-1.5 catalyst had good fibrous morphology, larger surface area, and more surface functional groups, with high reusability and significantly improved catalytic activity compared to other Pd@N-CNFs.
Achieving both high conversion and selectivity under mild conditions still remains a big challenge in the selective hydrogenation of phenol to cyclohexanone. Herein, one-dimensional (1D) N-doped carbon nanofibers (N-CNFs) were successfully fabricated by electrospinning with one-step carbonization, and used to load Pd nanoparticles for synthesizing Pd@N-CNFs catalysts. The dicyandiamide (DICY) and citric acid in the spinning solution exhibited a significant synergistic effect in controlling the morphology and surface property of N-CNFs and the corresponding catalytic activity of Pd@N-CNFs in the selective hydrogenation of phenol to cyclohexanone. The as-prepared Pd@N-CNFs-1.5 catalyst possessed good fibrous morphology, larger surface area, and more amounts of surface N and OH group, and exhibited a phenol conversion of 99.7% with a cyclohexanone selectivity of 97.3% under mild reaction conditions. In addition, the catalytic activity of Pd@N-CNFs-1.5 increased by 2.75 times as compared to Pd@N-CNFs-0 and 1.22 times in comparison with Pd@N-CNFs-100. Furthermore, the 1D Pd@N-CNFs-1.5 was easy to be recovered from the reaction mixture, and showed good reusability. [GRAPHICS] .
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