Citation: Yuzhuo Chen, Xiangqian Kong, Shanjun Mao, Zhe Wang, Yutong Gong, Yong Wang. Study of the role of alkaline sodium additive in selective hydrogenation of phenol[J]. Chinese Journal of Catalysis, ;2019, 40(10): 1516-1524. doi: S1872-2067(19)63386-3 shu

Study of the role of alkaline sodium additive in selective hydrogenation of phenol

Advanced Materials and Catalysis Group, Institute of Catalysis, Department of Chemsitry, Zhejiang University, Hangzhou 310028, Zhejiang, China

Received Date: 10 May 2019
Revised Date: 25 May 2019

Fund Project: This work ws supported by the National Natural Science Foundation of China (21622308), Key Program Supported by the Natural Science Foundation of Zhejiang Province, China (LZ18B060002), and the Fundamental Research Funds for the Central Universities (2017XZZX002-16) are greatly appreciated.

The selective hydrogenation of phenol to cyclohexanone is an important process in the chemical industry. However, achieving high selectivity at high conversion rates is highly challenging, particularly under continuous reaction conditions. Here, we found that the presence of Na alkaline additives (NaX, X=CO₃^2-, HCO₃^-, or OH^-) on Pd/Al₂O₃ not only promoted the phenol conversion from 8.3% to >99% but also increased the cyclohexanone selectivity from 89% to >97% during the continuous hydrogenation of phenol on a fixed bed reactor. After 1200 h of continuous reaction, no activity or selectivity attenuation was observed and the turnover number was approximately 2.9×10⁵. Density functional theory calculations, spectroscopic, and dynamics studies demonstrated that the addition of NaX greatly promoted phenol adsorption and hydrogen activation, thereby improving catalytic activity. Simultaneously, the formation of a "-C=O-Na-" intermediate inhibited the excessive hydrogenation and intermolecular coupling of cyclohexanone, leading to high selectivity.
- Cyclohexanone,
- Phenol,
- Alkaline additive,
- Mechanism,
- Selective hydrogenation
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