Chinese Journal of Catalysis ›› 2023, Vol. 45: 120-131.DOI: 10.1016/S1872-2067(22)64181-0
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Zhipeng Huanga,b,1, Yang Yangc,1, Junju Mua, Genheng Lia,d, Jianyu Hana,b, Puning Rena,b, Jian Zhanga, Nengchao Luoa, Ke-Li Hanc, Feng Wanga,*()
Received:
2022-09-22
Accepted:
2022-10-09
Online:
2023-02-18
Published:
2023-01-10
Contact:
Feng Wang
About author:
First author contact:1Contributed equally to this work.
Supported by:
Zhipeng Huang, Yang Yang, Junju Mu, Genheng Li, Jianyu Han, Puning Ren, Jian Zhang, Nengchao Luo, Ke-Li Han, Feng Wang. Controlling the reactions of free radicals with metal-radical interaction[J]. Chinese Journal of Catalysis, 2023, 45: 120-131.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64181-0
Fig. 1. (a) Reaction network of phenylacetic acid conversion over metal/TiO2 catalyst. (b) Photocatalytic conversion of phenylacetic acid and 2-phenylisobutyric acid over metal/TiO2 catalysts. Reaction conditions: substrate (0.15 mmol), photocatalyst (5 mg), acetonitrile (1.2 mL), Ar (0.1 MPa), room temperature (30 ± 5 ?°C), LEDs (365 nm, 18 W) irradiation for 3 h. Conversion and selectivity were determined by GC analysis.
Fig. 2. TA spectra averaged over 0.25-0.35 μs in the presence (blue) and absence (orange) of phenylacetic acid over Pt/TiO2 (a), Au/TiO2 (b), Rh/TiO2 (c), Ni/TiO2 (d), and Pd/TiO2 (e) catalysts. Transient decay of benzyl radical absorption signal at selected wavelength over Pt/TiO2 (f), Au/TiO2 (g), Rh/TiO2 (h), Ni/TiO2 (i), and Pd/TiO2 (j) catalysts. △Abs, the change in absorbance after laser pulse excitation; a, the kinetic weight coefficient; R2, the coefficient of fitting determination. Curves drawn on top of the data are guides to the eye.
Fig. 3. (a) The calculated binding energy of benzyl radical on different metal surfaces. The calculated partial density of states for benzyl radical binding on Pd (111) (b) and Pt (111) (c).
Scheme 1. Hydrodecarboxylation of carboxylic acids over Pd/TiO2. Yields were determined by GC analysis. a Isolated yield. b NMR yield. c HPLC yield. d Reaction was carried out on a 3.75 mmol (0.863 g) scale, reaction time (18 h).
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