Importance of V^(4)and optimal acid environment in the hydroxylation of inert benzene via activation of C_(sp2)-H bond  

作　　者：Peng Dong Yang Xin Yanwei Li Xiaohui Zhang Xiaorui Wang Yu Zhao Dongqiang Zhang Haowen Ma Guixian Li 

机构地区：[1]School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China [2]Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province,Lanzhou 730050,China [3]Lanzhou Petrochemical University of Vocational Technology,Lanzhou 730060,China [4]Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina Company Limited,Lanzhou 730060,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第10期216-226,共11页中国化学工程学报（英文版）

基　　金：the Support Program for Hongliu Young Teachers of Lanzhou University of Technology(02/062214);Young Talent Innovation Project of Lanzhou(2023-QN-103);Major science and technology projects of Gansu Province(22ZD6GA013).

摘　　要：Hydroxylation of inert benzene through the activation of the C_(sp2)-H bond is a representative reaction about the transformation of C-H bonds to C-O bonds,which has far-reaching guiding significance but remains a challenging scientific problem.To overcome this problem,a series of VOx-Ga_(2)O_(3)/SiO_(2)-Al_(2)O_(3)were prepared to achieve an efficient and economical hydroxylation path of benzene to phenol.The results showed that the phenol yield was 72.89%(selectivity>98.1%)under the optimum conditions.The reason is that the C-H bond in the benzene ring is activated by heterolysis over a VOx-Ga_(2)O_(3)/SiO_(2)-Al_(2)O_(3)catalyst.Meanwhile,the introduction of aluminum(Al)and gallium(Ga)made a qualitative change in the catalyst,enhancing the electron motion and spin motion of vanadium species,resulting in the increase of V4^(+)/V5^(+)ratio.In addition,the catalyst can provide an optimal acidic environment and a threedimensional cross-linked surface structure that facilitates product diffusion.

关 键 词：C_(sp2)-H activation V4^(+)/V5^(+)ratio Acid microenvironment Catalysis Support Catalyst activation 

分 类 号：O64[理学—物理化学]