期刊
CATALYSTS
卷 10, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/catal10050557
关键词
Pt-WO3 photocatalyst; visible light; hydroxylation of benzene; phenol formation; isotope (H2O)-O-18-labeling
Activation of C(sp2)-H in aromatic molecules such as benzene is one of the challenging reactions. The tungsten trioxide supported Pt nanoparticles (Pt-WO3) exhibited hydroxylation of benzene in the presence of air and H2O under visible-light (420 < lambda < 540 nm) irradiation. The photocatalytic activities (yields and selectivity of phenol) were studied under several experimental conditions. Furthermore, investigations of mechanistic insight into hydroxylation of benzene have been carried out by analyses with apparent quantum yields (AQY), an (H2O)-O-18 isotope-labeling experiment, kinetic isotope effects (KIE), electrochemical measurements and density functional theory (DFT) calculations. It was proposed that dissociation of the O-H bond in H2O is the rate-determining step. Furthermore, the substitution of the OH derived from H2O with H abstracted from benzene by photo-formed H(2)O(2)indicated a mechanism involving a push-pull process for the hydroxylation of benzene into phenol.
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