关键词:

苯酚, 原位加氢, Raney Ni, 表观动力学

Abstract:

The effect of reaction conditions on the performance of in-situ hydrogenation of phenol in liquid phase over Raney Ni catalyst was studied.The results indicated that higher phenol conversion and cyclohexanol selectivity could be obtained under the condition of higher temperature and pressure, and lower space velocity and methanol content, while phenol concentration had almost no effect on the reaction performance.The study of apparent kinetics indicated that the reaction orders with respect to phenol and adsorbed hydrogen for cyclohexanol formation (α₁ and β₁) were 0.93 and 3.82, respectively, and those for cyclohexanone formation (α₂ and β₂) were 1.09 and 3.47, respectively.The apparent activation energy to cyclohexanol (E_a1) and cyclohexanone (E_a2) were 67.8 kJ•mol^-1 and 80.2 kJ•mol^-1, respectively.The role of reaction conditions on the in-situ hydrogenation performance of phenol (hydrogenation rate, selectivity of products) could be clarified on the basis of the apparent kinetics results.

Key words:

苯酚, 原位加氢, Raney Ni, 表观动力学