Tuning of active sites in M/TiO2 for photocatalytic cyanation of olefins with high regioselectivity
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作者
C-H CYANATION; CATALYZED CYANATION; ANATASE TIO2; ALKENES; BOND; ARENES; HYDROCYANATION; ACETONITRILE; LOCATION; DEFECTS
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刊物名称
Appl. Catal. A-Gen.
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年、卷、文献号
2020, 604, 117787
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关键词
C-H CYANATION; CATALYZED CYANATION; ANATASE TIO2; ALKENES; BOND; ARENES; HYDROCYANATION; ACETONITRILE; LOCATION; DEFECTS
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摘要
The detailed structure of active sites plays an important role for the determination of catalytic performance. Herein, catalytic active sites of M/TiO2 for photocatalytic cyanation of olefins are tuned by delicate manipulation of the metal kinds, metal loading amount and pretreatment processes. It was found that the 0.1% Pt/P25 catalyst reduced at 300 degrees C possessed high metal dispersion and suitable oxygen defects on TiO2, and thus exhibited the best catalytic performance with high specific speed of time yield and high selectivity. A wide scope of olefin substrates could be converted to the corresponding nitriles with high atom efficiency and anti-Markovnikov regioselectivity under mild conditions for the optimized Pt/P25 catalyst. The reaction mechanism based on radical coupling of acetonitrile and olefins was also discussed. This approach offers an environmental-friendly platform for the selective activation of C-H bonds of acetonitrile and will bring potential applications for hydrofunctionalization of olefins.
