Chinese Journal of Catalysis ›› 2024, Vol. 57: 133-142.DOI: 10.1016/S1872-2067(23)64579-6
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Jian Danga,b, Weijie Lia,b, Bin Qina,*(), Yuchao Chaia, Guangjun Wua, Landong Lia,*(
)
Received:
2023-10-15
Accepted:
2023-12-08
Online:
2024-02-18
Published:
2024-02-10
Contact:
* E-mail: Supported by:
Jian Dang, Weijie Li, Bin Qin, Yuchao Chai, Guangjun Wu, Landong Li. Self-adjusted reaction pathway enables efficient oxidation of aromatic C-H bonds over zeolite-encaged single-site cobalt catalyst[J]. Chinese Journal of Catalysis, 2024, 57: 133-142.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64579-6
Fig. 2. Catalytic performance in EB selective oxidation. EB conversion and product distribution in EB selective oxidation over cobalt naphthenate (a) and Co@Y (b) catalysts. (c) Literature survey of heterogeneous catalysts for EB selective oxidation. Base metal catalysts are shown in circle and noble metal catalysts are shown in square [8??-11,50????????????????-67]. (d) Recycling test of Co@Y catalyst in EB selective oxidation. (one: acetophenone, ol: 1-phenylethanol, acid: benzoic acid, hyde: benzaldehyde). Reaction conditions: 65 μL cobalt naphthenate or 0.17 g Co@Y (both containing ~8.5 mg cobalt), 20 mL EB, 2 mmol biphenyl, 1.5 MPa O2, 383 K.
Fig. 3. Kinetic analyses of relevant steps in EB oxidation. Reaction rates (a) and Arrhenius plots (b) of EB oxidation to ACP over Co@Y catalyst. Reaction rates (c) and Arrhenius plots (d) of 1-phenylethanol oxidation to ACP over Co@Y catalyst. Reaction rates (e) and Arrhenius plots (f) of EB oxidation to ACP in the presence of benzaldehyde over Co@Y catalyst. Reaction conditions: 0.17 g Co@Y, 20 mL EB or 1-phenylethanol, 0 or 20 μL benzaldehyde, 2 mmol biphenyl, 1.5 MPa O2.
Fig. 4. Reaction mechanism of EB oxidation from DFT calculations. Proposed reaction pathways, optimized structures, and the corresponding energy profiles for the formation of PhCOCH3, PhCHOHCH3 and PhCHO over Co@Y zeolite at 0 K.
Fig. 5. Selective oxidation of aromatic C-H bonds. Time-dependent aromatic hydrocarbon conversion and product distribution over Co@Y catalyst. (a) Toluene; (b) propyl benzene; (c) 4-methyl-EB; (d) 1,4-diethyl benzene; (e) 4-methoxy-EB; (f) 4-nitro-EB. Reaction conditions: 0.17 g Co@Y, 20 mL substrate, 2 mmol biphenyl, 1.5 MPa O2. 423 K for toluene and 383 K for others.
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