期刊
CHEMICAL ENGINEERING JOURNAL
卷 442, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136226
关键词
Double-layered nanotube; Doping engineering; Oxygen vacancy; Heterojunction; Suzuki reaction
资金
- National Natural Science Foundation of China [51772158]
A unique strategy of double-layered nanotube morphology and Fe doping engineering is used to create surface oxygen vacancies and interface heterojunctions on CeO2 simultaneously, greatly enhancing the photocatalytic activity and selectivity of the catalyst.
Photocatalytic Suzuki reaction is attractive for utilization of renewable solar energy to produce biphenyl com-pounds at ambient temperature. Herein, a unique and controllable strategy is used to simultaneously create surface oxygen vacancies and interface heterojunctions on CeO(2 )with double-layered nanotube morphology via one-step Fe doping engineering. The double-layered structure can improve light receiving areas of supports, meanwhile expose sufficient active sites (Pd). The abundant oxygen vacancies on the surface of CeO2 and the CeO2@Fe2O3 heterojunctions tremendously extend response region of visible light and promote separation of photoinduced electron-hole pairs. The directional transfer of electrons induced by Fe doping to Pd accelerates the oxidative addition in Suzuki reactions, finally achieves high catalytic activity for biphenyl products with a turnover frequency (TOF) of 1770 h(-1) under visible light at ambient temperature, about 35 times higher than that of reaction without illumination.
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