脂肪醇(氢源)种类对苯酚及其衍生物液相原位加氢反应的影响

Liquid phase in-situ hydrogenation of phenol and it derivatives (phenol, o-cresol, and p-tertbutylphenol) using different aliphatic alcohols (methanol, ethanol, and ethylene glycol) as hydrogen sources over the Raney Ni and Pd/Al2O3 catalyst were investigated in a fixed-bed reactor. The effects of aliphatic alcohols (hydrogen sources) on the mechanism and reaction performance of the liquid phase in-situ hydrogenation of phenol were discussed. The experimental results showed that the conversion of phenol are 18.1, 40.4, and 17.2%, respectively, and the selectivity of cyclohexanone are 96.1, 92.4, and 91.7%, respectively, when using methanol, ethanol, and ethylene glycol as the hydrogen sources over the Pd/Al2O3 catalyst. These results indicated that the type of aliphatic alcohols (hydrogen sources) has a high effect on the liquid phase in-situ hydrogenation of phenol and it derivatives. The reaction mechanism of the liquid phase in-situ hydrogenation of phenol using different aliphatic alcohols as hydrogen sources could be different. Therefore, the choice of hydrogen sources (aliphatic alcohols) could improve the activity and selectivity in the liquid phase in-situ hydrogenation process.