Chinese Journal of Catalysis ›› 2023, Vol. 49: 16-41.DOI: 10.1016/S1872-2067(23)64430-4
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Mengistu Tulu Gonfaa, Sheng Shena,*(), Lang Chena,*(
), Biao Hua, Wei Zhoua, Zhang-Jun Baia, Chak-Tong Aub, Shuang-Feng Yina,*(
)
Received:
2023-02-23
Accepted:
2023-04-10
Online:
2023-06-18
Published:
2023-06-05
Contact:
*E-mail: About author:
Sheng Shen received her bachelors’ degree from Wuhan University, China, in 2012. Then she moved to the United States and received her Ph.D. degree in chemistry from the University of Georgia, working on the electrodepostion of semiconductor materials under the supervision of Prof. John L. Stickney. She is currently an associate professor at Hunan University, China, where she focuses on the development of efficient photoelectrodes for solar based energy harvesting and conversion.Supported by:
Mengistu Tulu Gonfa, Sheng Shen, Lang Chen, Biao Hu, Wei Zhou, Zhang-Jun Bai, Chak-Tong Au, Shuang-Feng Yin. Research progress on the heterogeneous photocatalytic selective oxidation of benzene to phenol[J]. Chinese Journal of Catalysis, 2023, 49: 16-41.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64430-4
Fig. 1. (a) Global phenol market demand by its derivatives in 2019. Adapted with permission from Ref. [3]. Copyright 2021, American Chemical Society. Representation of catalytic processes of benzene oxidation to phenol: (b) Sulfonation; (c) Chlorination; (d) Toulene benzoic acid process; (e) Cumene process; (f) Direct conversion to phenol [9].
Fig. 3. Band-edges, band gap energy positions of some semiconductors and relative redox potentials of the couples used to generate reactive oxygen species.
Fig. 5. Proposed reaction mechanism of the photocatalytic hydroxylation of benzene in (a) neutral or acidic conditions and (b) basic conditions. (c,d) Schematic of isotopic effect. Adapted with permission from Ref. [50]. Copyright 2012, American Chemical Society.
Fig. 6. (a) In situ ESR spectra of C16Qu-PW in reaction system (containing benzene 1.28 mmol, acetonitrile 10 mL, water 1 mL). (b) UV-vis spectra of recovered C16Qu-PW with different exposure time in air. (c) Proposed reaction route for C16Qu-PW photocatalyzed selective oxidation of benzene to phenol. Adapted with permission from Ref. [63]. Copyright 2021, Elsevier.
Fig. 7. Optimized structures of reactant, TS and product among benzene, H2O and H2O2 in the absence (a) and the presence (b) of Pt3 as co-catalyst for the hydroxylation of benzene to phenol. (c) Energy potentials for intrinsic reaction coordinates. Adapted with permission from Ref. [67]. Copyright 2020, MDPI. The author(s) and Catalysts published by the MDPI under the terms of the Creative Commons CC BY license (https://creative commons.org/licenses/by-ncnd/4.0/).
Fig. 8. Model for simulating the interface between g-C3N4-CuWO4 heterojunction for geometry optimization before optimization (a) and after (b) optimization. (c) Projected density of states (PDOS) of the pure g-C3N4 surface and g-C3N4-CuWO4 heterojunction surface from top to bottom, the dotted line represents the Fermi level. (d,e) Γ-point orbital-isoamplitude surface of the respective orbitals. Adapted with permission from Ref. [68]. Copyright 2022, Royal Society of Chemistry.
Fig. 11. (a) UV/Vis diffuse-reflectance spectra of Au@TiO2-microsphere composites. (b) Visible-light-induced catalytic oxidation of benzene with Au@TiO2 of 1 wt%-3 wt% of Au. (c) Mechanism of photocatalytic reaction for Au/TiO2 composed photocatalyst. Adapted with permission from Ref. [90]. Copyright 2011, Royal Society of Chemistry. (d) TEM images of 1Au/TV2, HRTEM images of 1Au/TV2, 3Au/TV2, SEM image of 1Au/TV2. (e) Possible mechanism of the photocatalytic oxidation of benzene to phenol proposed on the basis of experimental observations for Au/TV2. Adapted with permission from Ref. [22]. Copyright 2014, American Chemical Society.
Fig. 12. (a) Reaction scheme of surface modification of MCF by silylation. (b) Titanium oxide entrapped in cage-like mesopores of hydrophobically modified MCF for the hydroxylation of benzene. (c) Images of water contact angles on catalyst samples. Adapted with permission from [92]. Copyright 2011, Elsevier.
Fig. 13. Proposed reaction mechanisms for phenol production over Pt/WO3 (a) and Pt/TiO2 (b) photocatalysts. Adapted with permission from Ref. [16]. Copyright 2014, Royal Society of Chemistry. (c) Proposed mechanism of photocatalytic benzene hydroxylation to phenol over the hierarchical heterostructure of Bi2WO6/CdWO4. Adapted with permission from Ref. [102]. Copyright 2018, Elsevier.
Oxidant | Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|---|
H2O | Au@TiO2 | 300 W Xe lamp (λ ≥ 400 nm), RT, 3 h, H2O (50 mL), catal. (50 mg), benzene (0.07 mL) | 63 | 91 | [ |
H2O2 | Au/Ti0.98V0.02 O2 | UV light (200 nm ≤ λ ≤ 400 nm), RT, 18 h, CH3CN (2 mL), H2O2 (25%, catal. (30 mg), 2 mL), benzene (1 mL) | 16 | 88 | [ |
Pd/CeO2/TiO2 | Xe lamp λ > 420 nm, 80 °C, 10 h, CH3CN (10 mL), catal. (100 mg), benzene (1.36 mL), benzene:H2O2 (molar ratio) = 1:5 | 69.4 | 95 | [ | |
N2O | Pt/TiO2 | 450 W Xe lamp (λ > 300 nm), 4 h, benzene: H2O:CH3CN (0.05 mL: 24 mL: 1 mL), PH (3.5), air, catal. (25 mg), benzene (0.05 mL) | 2 | 100 | [ |
H2O | Cu/Ti/CNT | Low pressure Hg light source, (λ > 254 nm), H2O (20 mL), catal. (100 mg), benzene (20 mL) | 52 | 76 | [ |
TiO2/MCF | 300W Xe lamp (λ > 320 m), 2 h, CH3CN (0.3 mL), and H2O (29.7 mL), catal. (30 mg), benzene (2.6 × 10-4 mL) | — | 50 | [ | |
Pt/TiO2 | 300 W Xe lamp, RT, 3 h, H2O (1 mL), catal. (20 mg), benzene (1 mL). | 9 | 75 | [ | |
H2O2 | FeVCu/TiO2 | Black light blue fluorescent bulb, 30 °C, 4 h, CH3CN (40 mL), catal. (10 mg), benzene:H2O2 = 0.5 | 9.7 | 52 | [ |
Ti0.98Fe0.01Cr0.01O2 | 450 W Hg lamp (200 nm ≤ λ ≤ 400 nm), RT, 12 h, CH3CN (2 mL), H2O2 (25%, 2 mL), catal. (30 mg), benzene (1 mL) | 25.2 | 90 | [ |
Table 1 Summary of photocatalytic performances based on hybridized TiO2 for the selective transformation of benzene to Phenol.
Oxidant | Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|---|
H2O | Au@TiO2 | 300 W Xe lamp (λ ≥ 400 nm), RT, 3 h, H2O (50 mL), catal. (50 mg), benzene (0.07 mL) | 63 | 91 | [ |
H2O2 | Au/Ti0.98V0.02 O2 | UV light (200 nm ≤ λ ≤ 400 nm), RT, 18 h, CH3CN (2 mL), H2O2 (25%, catal. (30 mg), 2 mL), benzene (1 mL) | 16 | 88 | [ |
Pd/CeO2/TiO2 | Xe lamp λ > 420 nm, 80 °C, 10 h, CH3CN (10 mL), catal. (100 mg), benzene (1.36 mL), benzene:H2O2 (molar ratio) = 1:5 | 69.4 | 95 | [ | |
N2O | Pt/TiO2 | 450 W Xe lamp (λ > 300 nm), 4 h, benzene: H2O:CH3CN (0.05 mL: 24 mL: 1 mL), PH (3.5), air, catal. (25 mg), benzene (0.05 mL) | 2 | 100 | [ |
H2O | Cu/Ti/CNT | Low pressure Hg light source, (λ > 254 nm), H2O (20 mL), catal. (100 mg), benzene (20 mL) | 52 | 76 | [ |
TiO2/MCF | 300W Xe lamp (λ > 320 m), 2 h, CH3CN (0.3 mL), and H2O (29.7 mL), catal. (30 mg), benzene (2.6 × 10-4 mL) | — | 50 | [ | |
Pt/TiO2 | 300 W Xe lamp, RT, 3 h, H2O (1 mL), catal. (20 mg), benzene (1 mL). | 9 | 75 | [ | |
H2O2 | FeVCu/TiO2 | Black light blue fluorescent bulb, 30 °C, 4 h, CH3CN (40 mL), catal. (10 mg), benzene:H2O2 = 0.5 | 9.7 | 52 | [ |
Ti0.98Fe0.01Cr0.01O2 | 450 W Hg lamp (200 nm ≤ λ ≤ 400 nm), RT, 12 h, CH3CN (2 mL), H2O2 (25%, 2 mL), catal. (30 mg), benzene (1 mL) | 25.2 | 90 | [ |
Oxidant | Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|---|
O2 | C16Qu-PW (IL-POM) | 500 W Hg lamp (λ ≤ 365 nm), room temp. 10 h, CH3CN (10 mL) and H2O (1 mL), air, catal. (0.15 mg), benzene (0.1 mL) | 21 | 99 | [ |
Bi2WO6/CdWO4 | 300 W Xenon lamp (λ ≥ 400 nm), 3 h, H2O (0.1 mL) and CH3CN (3 mL), O2 (3 mL min‒1), catal. (50 mg), benzene (0.04 mL) | 5.8 | 99 | [ | |
H2O | Pt/WO3 | 300 W Xe lamp (400 < λ < 500 nm), 4 h, H2O (7.5 mL), catal. (10 mg), benzene (0.002 mL) | — | 79 | [ |
WO3QD | Hg lamp (270 < λ < 410 nm), 40 h, H2O (29 mL), catal. (10 mg), benzene (0.1 mL). | 8.3 | 99 | [ |
Table 2 Summary of photocatalytic performances based on hybridized tungsten compounds for the selective transformation of benzene to Phenol.
Oxidant | Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|---|
O2 | C16Qu-PW (IL-POM) | 500 W Hg lamp (λ ≤ 365 nm), room temp. 10 h, CH3CN (10 mL) and H2O (1 mL), air, catal. (0.15 mg), benzene (0.1 mL) | 21 | 99 | [ |
Bi2WO6/CdWO4 | 300 W Xenon lamp (λ ≥ 400 nm), 3 h, H2O (0.1 mL) and CH3CN (3 mL), O2 (3 mL min‒1), catal. (50 mg), benzene (0.04 mL) | 5.8 | 99 | [ | |
H2O | Pt/WO3 | 300 W Xe lamp (400 < λ < 500 nm), 4 h, H2O (7.5 mL), catal. (10 mg), benzene (0.002 mL) | — | 79 | [ |
WO3QD | Hg lamp (270 < λ < 410 nm), 40 h, H2O (29 mL), catal. (10 mg), benzene (0.1 mL). | 8.3 | 99 | [ |
Fig. 14. (a) Illustration of the structural benefits of FeVO4@OS for photocatalytic benzene hydroxylation reaction. (b) ICP results of iron leaching across five runs. (c) Selective hydroxylation of benzene to phenol over FeVO4 and silylated FeVO4. Adapted with permission from Ref. [104]. Copyright 2021, Royal Society of Chemistry.
Fig. 15. (a) Optical contact angle characterization of ZFO and ZFO@C-2. (b) Benzene reactant adsorption extent of ZFO and ZFO@C-2. Adapted with permission from Ref. [60]. Copyright 2021, Elsevier.
Fig. 16. (a) Topological view of MIL-100 with MTN-type zeolitic architecture and view of the structure of MIL-68 involving two types (hexagonal and trigonal) of channels running through the c-axis. (b) Possible reaction mechanism for the photocatalytic benzene hydroxylation over MIL-100(Fe). Adapted with permission from Ref. [106]. Copyright 2021, American Chemical Society. (c) Preparation of the NH2-MIL-88/PMo10V2-3 catalyst, Adapted with permission from Ref. [108]. Copyright 2021, Royal Society of Chemistry.
Fig. 17. (a) Possible reaction mechanism for photocatalytic benzene hydroxylation over CNTs@FcPOP. Adapted with permission from Ref. [108]. Copyright 2021, Royal Society of Chemistry. (b) Proposed reaction mechanism for benzene hydroxylation by Fc-CN.
Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|
NH2-MIL-88/PMo10V2-3 | 5 W LED (≥ 320 nm), 60 °C, 3 h, CH3CN (2 mL), CH3COOH (3 mL), H2O2 (1 mL), catal. (50 mg), benzene (1 mL) | 12.4 | 99 | [ |
MIL-68 (Fe) | 300 W Xe lamp (λ ≥ 420 nm), 8 h, solvent (4 mL), H2O2 (30%, 0.039 mL), catal. (10 mg), benzene (0.044 mL) | — | 98 | [ |
CNTs@Fc-POP | 300 W, 4 h, CH3CN (4 mL), H2O (4 mL), H2O2 (0.8 mL), catal. (50 mg), benzene (0.2 mL) | 25 | — | [ |
FeVO4@TMOS | 300 W Xe lamp (λ > 420 nm), 24 °C, CH3CN (3 mL), H2O (3 mL), H2O2 (30%, 2 mL), catal. (30 mg), benzene (0.1 mL) | 20 | 98 | [ |
FePc | Hg lamp, RT, 6 h, CH3CN (5 mL), H2O2 (3 mL), catal. (30 mg), benzene (1 mL), | 15.2 | 99 | [ |
ZFO@C-2 | 300 W Xe lamp (λ < 420 nm), RT, CH3CN (3 mL), H2O (3 mL), H2O2 (30 wt%, 0.5 mL), catal. (30 mg), benzene (0.1 mL). | 15.5 | 99.4 | [ |
Table 3 Summary of photocatalytic performances based on hybridized iron compounds for the selective transformation of benzene to phenol.
Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|
NH2-MIL-88/PMo10V2-3 | 5 W LED (≥ 320 nm), 60 °C, 3 h, CH3CN (2 mL), CH3COOH (3 mL), H2O2 (1 mL), catal. (50 mg), benzene (1 mL) | 12.4 | 99 | [ |
MIL-68 (Fe) | 300 W Xe lamp (λ ≥ 420 nm), 8 h, solvent (4 mL), H2O2 (30%, 0.039 mL), catal. (10 mg), benzene (0.044 mL) | — | 98 | [ |
CNTs@Fc-POP | 300 W, 4 h, CH3CN (4 mL), H2O (4 mL), H2O2 (0.8 mL), catal. (50 mg), benzene (0.2 mL) | 25 | — | [ |
FeVO4@TMOS | 300 W Xe lamp (λ > 420 nm), 24 °C, CH3CN (3 mL), H2O (3 mL), H2O2 (30%, 2 mL), catal. (30 mg), benzene (0.1 mL) | 20 | 98 | [ |
FePc | Hg lamp, RT, 6 h, CH3CN (5 mL), H2O2 (3 mL), catal. (30 mg), benzene (1 mL), | 15.2 | 99 | [ |
ZFO@C-2 | 300 W Xe lamp (λ < 420 nm), RT, CH3CN (3 mL), H2O (3 mL), H2O2 (30 wt%, 0.5 mL), catal. (30 mg), benzene (0.1 mL). | 15.5 | 99.4 | [ |
Fig. 19. (a) Ultraviolet-visible diffuse reflectance spectra (UV-vis DRS) of h-BCNx and h-BN. (b) Tauc plots of h-BN and h-BCNx by UV-vis DRS. (c) Proposed mechanism for photocatalytic hydroxylation of benzene by h-BCN combined with FeCl3. (d) Time course of catalytic performance for benzene oxidation to phenol under visible light irradiation (λ ≥ 420 nm). (e) Cyclic runs in the photocatalytic oxidation of benzene to phenol. Adapted with permission from Ref. [120]. Copyright 2019, Elsevier.
Fig. 20. (a) Proposed mechanism for the oxidation of benzene by the Au-Pd/g-C3N4 catalyst under visible light irradiation. Adapted with permission from Ref. [121]. Copyright 2018, American Chemical Society. Copyright 2018, American Chemical Society. (b,c) Optical absorption spectra of FeCl3/mpg-C3N4. (d) Possible reaction mechanism for the catalytic oxidation of benzene by FeCl3/mpg-C3N4 hybrids. Adapted with permission from Ref. [12]. Copyright 2013, Royal Society of Chemistry.
Fig. 21. (a) Stacked g-C3N4 sheets function as an all-organic solid-state photocatalyst promoting redox reactions with visible light. (b) Chemical interaction of benzene and defective g-C3N4 via HOMO-LUMO hybridization of melem and benzene. Adapted with permission from Ref. [123]. Copyright 2009, American Chemical Society.
Fig. 22. (a) N2 adsorption-desorption isotherms of TS-1 and Fe-CN/TS-1-2. The inset is the corresponding BJH pore-size distribution curves. (b) Electrochemical impedance in the dark. (c) STEM images of Fe-CN/TS-1 (a,b), elemental mapping images of C, N, and Fe. Adapted with permission from Ref. [125]. Copyright 2014, Elsevier.
Fig. 23. Proposed direct Z-scheme reaction mechanism of photocatalytic system. Adapted with permission from Ref. [68]. Copyright 2022, Royal Society of Chemistry.
Fig. 24. (a) Illustration of the preparation of SA-Cu-TCN. (b,c) Calculated charge difference surfaces of the Cu-N3 and Cu-N4 coordination systems. Adapted with permission from Ref. [127]. Copyright 2020, Wiley-VCH.
Fig. 25. (a,b) XANES of Zn2Ti-LDH. (c) ESR of Zn2Ti-LDH. (d) Model of Oxygen vacancy Zn2Ti-LDH. Adapted with permission from Ref. [134]. Copyright 2020, Elsevier.
Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|
FeCl3/mpg-C3N4 | 100 W Hg lamp (λ > 420 nm), 60 °C, 4 h, H2O (2 mL) and CH3CN (2 mL), H2O2 (30%, 0.255 mL), catal. (25 mg), benzene (0.39 mL). | — | 97 | [ |
h-BCN/FeCl3 | 300 W Xe, lamp (λ > 420 nm), 60 °C, 2 h, H2O (4 mL) and CH3CN (4 mL), H2O2 (0.15 mL), catal. (50 mg) with FeCl3 (3 wt%), benzene (0.8 mL) | 14 | 88 | [ |
Fe@NC | 60 °C, 12 h, CH3CN (3 mL), H2O (3 mL), H2O2 (2 mL), catal. (30 mg), benzene (0.25 mL) | 14.5 | 95 | [ |
Au-Pd/g-C3N4 | 100 W Hg lamp, light source 10 cm, 50 °C, 2 h, CH3CN (5 mL), H2O2 (25%, 2 mL), catal. (10 mg), benzene (1 mL). | 26 | 100 | [ |
Fe-g-C3N4/SBA-15 | 500 W Xe lamp (λ > 420 nm), 60 °C, 4 h, H2O (4 mL), C2H5OH (5 mL) and CH3CN (4 mL), H2O2 (30%, 0.51 mL), catal. (50 mg), benzene (0.8 mL). | — | 21 | [ |
Fe-g-C3N4-LUS-1 | 125 W Mercury lamp, 60 °C, 4 h, CH3CN (4 mL), H2O2 (30%, 0.5 mL), catal. (0.05 g), benzene (1 mL). | 5 | 64 | [ |
Fe-CN/TS-1 | 300 W Xe lamp (λ > 420 nm), 60 °C, 4 h, CH3CN (4 mL) and H2O (4 mL), H2O2 (30%, 0.51 mL), catal. (50 mg), benzene (0.8 mL). | 10 | 18 | [ |
SA-Cu-TCN | Visible light (λ > 420 nm), 50 °C, 12 h, CH3CN (6 mL), H2O2 (6 mL, 30 wt%), catal. (20.0 mg), benzene (0.4 mL). | — | 99.9 | [ |
Ni-CuWO4/g-C3N4 | Sun light, 0.25 h, H2O (0.2 mL), H2O2 (30%), (0.5 mL), catal. (20 mg), benzene (1 mL) | 81.5 | 98.5 | [ |
Table 4 Summary of photocatalytic performances based on hybridized g-C3N4 compounds for the selective transformation of benzene to Phenol.
Catalyst | Reaction condition | Yield (%) | Sel. (%) | Ref. |
---|---|---|---|---|
FeCl3/mpg-C3N4 | 100 W Hg lamp (λ > 420 nm), 60 °C, 4 h, H2O (2 mL) and CH3CN (2 mL), H2O2 (30%, 0.255 mL), catal. (25 mg), benzene (0.39 mL). | — | 97 | [ |
h-BCN/FeCl3 | 300 W Xe, lamp (λ > 420 nm), 60 °C, 2 h, H2O (4 mL) and CH3CN (4 mL), H2O2 (0.15 mL), catal. (50 mg) with FeCl3 (3 wt%), benzene (0.8 mL) | 14 | 88 | [ |
Fe@NC | 60 °C, 12 h, CH3CN (3 mL), H2O (3 mL), H2O2 (2 mL), catal. (30 mg), benzene (0.25 mL) | 14.5 | 95 | [ |
Au-Pd/g-C3N4 | 100 W Hg lamp, light source 10 cm, 50 °C, 2 h, CH3CN (5 mL), H2O2 (25%, 2 mL), catal. (10 mg), benzene (1 mL). | 26 | 100 | [ |
Fe-g-C3N4/SBA-15 | 500 W Xe lamp (λ > 420 nm), 60 °C, 4 h, H2O (4 mL), C2H5OH (5 mL) and CH3CN (4 mL), H2O2 (30%, 0.51 mL), catal. (50 mg), benzene (0.8 mL). | — | 21 | [ |
Fe-g-C3N4-LUS-1 | 125 W Mercury lamp, 60 °C, 4 h, CH3CN (4 mL), H2O2 (30%, 0.5 mL), catal. (0.05 g), benzene (1 mL). | 5 | 64 | [ |
Fe-CN/TS-1 | 300 W Xe lamp (λ > 420 nm), 60 °C, 4 h, CH3CN (4 mL) and H2O (4 mL), H2O2 (30%, 0.51 mL), catal. (50 mg), benzene (0.8 mL). | 10 | 18 | [ |
SA-Cu-TCN | Visible light (λ > 420 nm), 50 °C, 12 h, CH3CN (6 mL), H2O2 (6 mL, 30 wt%), catal. (20.0 mg), benzene (0.4 mL). | — | 99.9 | [ |
Ni-CuWO4/g-C3N4 | Sun light, 0.25 h, H2O (0.2 mL), H2O2 (30%), (0.5 mL), catal. (20 mg), benzene (1 mL) | 81.5 | 98.5 | [ |
Fig. 26. Effect of temperature on benzene conversion to phenol in terms of phenol yield (%) and selectivity (%). Adapted with permission from Ref. [121]. Copyright 2018, American Chemical Society.
Fig. 28. SEM images of FeVO4@TMOS-5th (a), FeVO4@TMOS (b), ICP results of iron leaching during each run (c). Adapted with permission from Ref. [104]. Copyright 2021, Royal Society of Chemistry.
Fig. 30. Two-phase membrane reactor: non membrane zone (1), lamp (2), non-membrane zone stirred solution (3), peristaltic pump that withdraws the solution from the photocatalytic zone to the separation zone (4), permeation module (5), aqueous phase compartment (6), Organic strip containing compartment (7). Adapted with permission from Ref. [137]. Copyright 209, Elsevier.
Fig. 31. Roadmap for assisting reaction development in photocatalysis using mechanistic studies. Adapted with permission from Ref. [168]. Copyright 2019, Wiley-VCH.
Fig. 33. Schematic of the encapsulation of metal nanoparticles in a matrix of covalently cross-linked dendrimers. Adapted with permission from Ref. [172]. Copyright 2009, De Gruyter.
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