Direct liquid phase hydroxylation of benzene with an inner-circulated H2-O2 mixture over Pd or Pd-V modified Hβ catalysts at ambient conditions
The direct liquid phase hydroxylation of benzene with hydrogen (H2)-oxygen (O2) mixture was achieved through a sealed gaseous inner-circulated process in the presence of Pd-V modified H catalyst. The results indicated that Pd-V modified H with an atomic ratio of V to Pd for 4 possessed the best catalytic performance and that acidic acid aqueous solution was the excellent media for direct hydroxylation of benzene with H2 and O2. Under the optimum reaction conditions, a relatively high formation rate of phenol (41.5 mmol PhOH/mmol Pd.h) and highly-efficient utilization of H2-O2 mixture as well as negligible loss of benzene volatilization could be simultaneously realized at 333 K. Besides, a synergistic mechanism was proposed to explain the favorable effects of introducing V oxides and adding water in acetic acid medium.
Hongfeng Li Zaihui Fu Xiangyou Peng Dulin Yin
Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）