Bicomponent VO2-defects/MWCNT catalyst for hydroxylation of benzene to phenol: Promoter effect of defects on catalytic performance

A novel bicomponent catalyst, VO2 supported on multi-walled carbon nanotubes (MWCNTs) with defects as promoter (VO2-defects/MWCNTs) was synthesized for the hydroxylation of benzene to phenol. In the bicomponent system, VO2 nanoparticles with 2–10 nm were prepared by the spontaneous redox between V5+ and defects of MWCNTs. Moreover, defects of MWCNTs were firstly used as promoters for preventing the oxidation of phenol and transferring electrons in the catalysis. Thus, compared with other vanadium catalysts, VO2-defects/MWCNTs show excellent catalytic performance for the hydroxylation of benzene to phenol, which indicates defects as promoter are quite promising for catalyzing the hydroxylation of benzene.

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► VO2-defects/MWCNTs bicomponent catalysts.
► Defects of MWCNTs were firstly used as promoters.
► Defects could transfer electron and prevent phenol oxidation in the catalysis.
► Compared with other catalysts, VO2-defects/MWCNTs show excellent performance.