Enhanced activity of microwave-activated CoOx/MOR catalyst for the epoxidation of α-pinene with air

Tao, Peipei; Lu, Xinhuan; Zhang, Haifu; Jing, Run; Huang, Fengfeng; Wu, Sha; Zhou, Dan; Xia, Qinghua

doi:10.1016/j.mcat.2018.11.006

Cited by 17 publications

(7 citation statements)

References 43 publications

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“…When using other solvents such as cyclohexanone, DMA, 1,4-dioxane, toluene, and tetrachloroethane, the conversion of diolefins was less than 10%. The results were consistent with those reported in the literature. , When DMF was used as the solvent, it could coordinate with Co 2+ to form the active center, beneficial to the activation of oxygen molecules in the air. Hence, DMF was generally selected as the solvent for the epoxidation of diolefins.…”

Section: Resultssupporting

confidence: 92%

“…The results were consistent with those reported in the literature. 27,42 When DMF was used as the solvent, it could coordinate with Co 2+ to form the active center, beneficial to the activation of oxygen molecules in the air. Hence, DMF was generally selected as the solvent for the epoxidation of diolefins.…”

Section: Resultsmentioning

confidence: 99%

“…Our group has synthesized a series of MOx/zeolite catalysts by microwave heating impregnation and carried out the epoxidation reaction of α-pinene with the aid of microwave heating instead of traditional heating. 42 It was indicated that the microwave heating could shorten the reaction time, accurately control the reaction temperature, speed up the reaction process, and further increase the product yield. This work mainly achieves excellent conversion and selectivity in the epoxidation of mixed diolefins over ZnCo-MOF catalysts under microwave heating, with no assistance of any initiator or coreducing agent.…”

Section: Introductionmentioning

confidence: 99%

“…But when using microwave heating, the product yield of the reaction can reach about 83%, and the selectivity of benzaldehyde also improved to 46 ± 3%. Our group has synthesized a series of MO x /zeolite catalysts by microwave heating impregnation and carried out the epoxidation reaction of α-pinene with the aid of microwave heating instead of traditional heating . It was indicated that the microwave heating could shorten the reaction time, accurately control the reaction temperature, speed up the reaction process, and further increase the product yield.…”

Section: Introductionmentioning

confidence: 99%

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Microwave-Assisted Air Epoxidation of Mixed Biolefins over a Spherical Bimetal ZnCo-MOF Catalyst

Yang

Zhang

Tao

et al. 2021

ACS Appl. Mater. Interfaces

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Here, we report the synthesis of spherical bimetal ZnCo-MOF materials by a hydrothermal rotacrystallization method and their catalytic activity on the air epoxidation of mixed biolefins enhanced by microwaves. The structural and chemical properties of the ZnCo-MOF materials were fully characterized by XRD, IR, SEM, TG, XPS, and NH 3 -TPD. The morphology of the material exhibited a three-dimensional spherical structure. From an NH 3 -TPD test of the ZnCo-MOF catalyst, it could be concluded that the Zn 0.1 Co 1 -MOF-H-150 rpm material had the highest acidic content and the strongest acidity among the catalysts synthesized by different methods, which gave the best performance in the epoxidation of mixed biolefins. The air epoxidation reaction was carried out under atmospheric pressure and microwave conditions, in the absence of any initiator or coreducing agent. Moreover, the Zn 0.1 Co 1 -MOF catalyst could be recycled six times without reducing the catalytic activity significantly, which showed the stability of spherical catalyst material under microwaves.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microwave-Assisted Air Epoxidation of Mixed Biolefins over a Spherical Bimetal ZnCo-MOF Catalyst

Yang

Zhang

Tao

et al. 2021

ACS Appl. Mater. Interfaces

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“…Cobalt catalysts have been investigated for alkene epoxidation with O 2 in the liquid phase. − Typically, cobalt-containing zeolites or molecular sieves exhibit considerable catalytic activity in the epoxidation of long-chain terminal alkenes (e.g., 1-decene and 1-dodecene), cycloalkenes (e.g., cyclohexene and cyclooctene), and phenyl substituted alkenes (e.g., styrene). − In most cases, additional initiators like organic peroxides or additives like aldehyde are involved in accelerating the epoxidation reaction. ,− These reagents and a large amount of solvent employed make the reaction system intricate. Accordingly, poor catalyst reproducibility and poor recyclability are encountered in the liquid-phase alkene epoxidation with O 2 .…”

Section: Introductionmentioning

confidence: 99%

Direct Propylene Epoxidation with Molecular Oxygen over Cobalt-Containing Zeolites

et al. 2022

J. Am. Chem. Soc.

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Direct propylene epoxidation with molecular oxygen is a dream reaction with 100% atom economy, but aerobic epoxidation is challenging because of the undesired over-oxidation and isomerization of epoxide products. Herein, we report the construction of uniform cobalt ions confined in faujasite zeolite, namely, Co@Y, which exhibits unprecedented catalytic performance in the aerobic epoxidation of propylene. Propylene conversion of 24.6% is achieved at propylene oxide selectivity of 57% at 773 K, giving a state-of-the-art propylene oxide production rate of 4.7 mmol/gcat/h. The catalytic performance of Co@Y is very stable, and no activity loss can be observed for over 200 h. Spectroscopic analyses reveal the details of molecular oxygen activation on isolated cobalt ions, followed by interaction with propylene to produce epoxide, in which the Co2+–Coδ+–Co2+ (2 < δ < 3) redox cycle is involved. The reaction pathway of propylene oxide and byproduct acrolein formation from propylene epoxidation is investigated by density functional theory calculations, and the unique catalytic performance of Co@Y is interpreted. This work presents an explicit example of constructing specific transition-metal ions within the zeolite matrix toward selective catalytic oxidations.

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Catalytic Isomerization of α-Pinene Epoxide Over a Natural Zeolite

et al. 2020

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Enhanced activity of microwave-activated CoOx/MOR catalyst for the epoxidation of α-pinene with air

Cited by 17 publications

References 43 publications

Microwave-Assisted Air Epoxidation of Mixed Biolefins over a Spherical Bimetal ZnCo-MOF Catalyst

Microwave-Assisted Air Epoxidation of Mixed Biolefins over a Spherical Bimetal ZnCo-MOF Catalyst

Direct Propylene Epoxidation with Molecular Oxygen over Cobalt-Containing Zeolites

Catalytic Isomerization of α-Pinene Epoxide Over a Natural Zeolite

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