Acta Phys. -Chim. Sin. ›› 2025, Vol. 41 ›› Issue (4): 100038.doi: 10.3866/PKU.WHXB202408015
• ARTICLE • Previous Articles
Zhuoyan Lv1,2, Yangming Ding1, Leilei Kang1,*(
), Lin Li1, Xiao Yan Liu1,*(
), Aiqin Wang1, Tao Zhang1
Received:2024-08-27
Revised:2024-09-25
Accepted:2024-10-02
Published:2024-12-28
Contact:
Email: xyliu2003@dicp.ac.cn; Tel.: +86-411-84379416 (Xiao Yan Liu)leikang@dicp.ac.cn (Leilei Kang)
Supported by:Zhuoyan Lv, Yangming Ding, Leilei Kang, Lin Li, Xiao Yan Liu, Aiqin Wang, Tao Zhang. Light-Enhanced Direct Epoxidation of Propylene by Molecular Oxygen over CuOx/TiO2 Catalyst[J]. Acta Phys. -Chim. Sin. 2025, 41(4), 100038. doi: 10.3866/PKU.WHXB202408015
Fig 2
Photocatalytic activity of CuOx/TiO2 catalyst in the DEP reaction. (a) PO formation rate at different temperatures with/without light and (b) Ea under dark and light conditions. (c) Rate of PO formation as a function of light intensity at 200 ℃. (d) The PO formation rate under UV and UV + Vis light at 200 ℃."
Fig 3
Photo-effect on CuOx/TiO2 catalyst. (a) FT k2-weighted EXAFS spectra and the fitting results at Cu K-edge of CuOx/TiO2 pretreated under dark and light conditions (without phase correction), (b) in situ EPR spectra in the dark and after 10 min of light irradiation, (c) in situ XPS spectra of Cu 2p and (d) Cu LMM with and without light irradiation."
Table 1
EXAFS data fitting results of the CuOx/TiO2 catalyst pretreated under dark and light reaction conditions."
| Sample | Shell | CN a | R (Å) | σ2 | ΔE0 (eV) | R factor (%) |
| CuOx/TiO2-Dark | Cu-O | 3.5 | 1.95 ± 0.004 | 0.005 | −0.8 | 0.2 |
| Cu-Cu1 | 2.0 | 2.92 ± 0.01 | 0.006 | |||
| Cu-Cu2 | 2.0 | 3.07 ± 0.01 | 0.005 | |||
| CuOx/TiO2-Light | Cu-O | 3.5 | 1.95 ± 0.01 | 0.006 | −0.5 | 0.4 |
| Cu-Cu1 | 1.1 | 2.85 ± 0.02 | 0.006 | |||
| Cu-Cu2 | 3.0 | 3.01 ± 0.02 | 0.013 |
Fig 6
Characterization of O2 activation. (a) In situ EPR spectra in the dark and after 10 minutes of light irradiation. (b) In situ CO-DRIFTS of CuOx/TiO2 under different conditions. (c) O2-TPD profiles of the CuOx/TiO2 catalyst under different conditions. (d) In situ Raman spectroscopy for O2 absorption in darkness and after irradiation."
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