One-step production of adipic acid from cyclohexane over stable oxides (CeO2 &amp; ZrO2) using O2: Enhanced oxidation activity in acidic medium

Dandapat, Sudip; Rao, J. Laxmikanth; Likhar, Pravin R.; Payra, Soumitra; Roy, Sounak; Baidya, Tinku

doi:10.1016/j.catcom.2022.106555

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…Since CHHP was almost completely converted into cyclohexanol and cyclohexanone under 0.64 MPa, the selectivity of KA oil was slightly improved to 86.5% under this condition. As for aerobic oxidation of cyclohexane triggered by cyclohexyl and/or oxygen radicals (C 6 H 11 · and O 2 ·), , the moderately increased partial pressure of oxygen is appreciated to enhance the activity but will result in overoxidation of intermediates, especially under high pressures ( p O 2 ≥ 0.7 MPa). The above results imply that the optimal oxygen partial pressure for maintaining a high KA oil selectivity is 0.64 MPa.…”

Section: Resultsmentioning

confidence: 99%

Roles of the A-Site Ca Dopant in Modifying Surface Properties of a Co-Based Perovskite Catalyst for Selective Oxidation of Cyclohexane

Li,

Hao,

Chen

et al. 2024

Ind. Eng. Chem. Res.

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Selective catalytic oxidation of cyclohexane into cyclohexanol and cyclohexanone (KA oil) is an important but challenging reaction in the modern chemistry industry, which is characterized by a low KA oil selectivity under high conversion of cyclohexane. To solve the contradictory issue between cyclohexane conversion and KA oil selectivity, A-site-doped Co-based perovskite oxides (La 1−x A x CoO 3 , A = Mg, Ca, Sr, and Ba) as catalysts are used for solvent-free cyclohexane oxidation using molecular oxygen as an oxidant. Among all selected perovskite catalysts, Ca element-modified La 0.5 Ca 0.5 CoO 3 exhibits the best catalytic performance with a cyclohexane conversion of 7.7% and a KA oil selectivity of 86.5% under optimal reaction conditions. The characterization results show that doping the Ca element into the A-site can effectively regulate the surface properties of LaCoO 3 by changing the molar ratio of Co 2+ /Co 3+ ions, creating more oxygen vacancies, and altering the acidity and basicity, which play essential roles in promoting the activation of O 2 and the reduction/ decomposition of cyclohexyl hydroperoxide (CHHP). This work demonstrates that the catalytic performance of LaCoO 3 in the aerobic oxidation of cyclohexane can be further modified by optimizing its A-site compositions, which opens a large space for the design of highly active and selective perovskite-type catalysts for partial oxidation of saturated alkanes.

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Section: Resultsmentioning

confidence: 99%

Roles of the A-Site Ca Dopant in Modifying Surface Properties of a Co-Based Perovskite Catalyst for Selective Oxidation of Cyclohexane

Li,

Hao,

Chen

et al. 2024

Ind. Eng. Chem. Res.

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Aerobic Oxidation of Vanillyl Alcohol to Vanillin Over CeO₂‐Co₃O₄ Catalyst

Manojkumar,

Yogendra,

Sai Megana

et al. 2024

ChemistrySelect

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A promising CeO2‐Co3O4 (9 : 1 mole ratio based on oxides) non‐noble metal based mixed oxide catalyst was explored for selective oxidation of vanillyl alcohol with molecular oxygen to produce vanillin under atmosphere pressure. In particular, to enhance its efficiency, this catalyst was prepared by adopting different preparation methods namely, template assisted, coprecipitation with and without surfactant, wet‐impregnation, and solution combustion. The prepared catalysts were characterized by XRD, Raman, BET surface area, ICP‐OES, FE‐SEM, HR‐TEM, H2‐TPR, and XPS. Among various catalysts investigated, the template assisted synthesized catalyst exhibited superior activity (100 % conversion and selectivity) and high stability. The better activity of this catalyst was found to be due to reduced crystallite size, high specific surface area (92 m2/g), more surface oxygen, and improved redox behaviour as confirmed from XRD, BET surface area, XPS, and H2‐TPR analysis, respectively. The stability of the catalyst was tested by reusability test and was observed that there is not much decrease in the catalytic activity up to five cycles. Further, the catalytic activity was optimized by varying the reaction parameters such as time, solvent, temperature, and catalyst weight.

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Hydrodeoxygenation of cyclohexanol and cyclohexanone

Khemthong,

Kaewmeesri,

Osakoo

et al. 2024

Advances in Hydrotreating for Integrated Biofuel Production

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One-step production of adipic acid from cyclohexane over stable oxides (CeO2 & ZrO2) using O2: Enhanced oxidation activity in acidic medium

Cited by 4 publications

References 26 publications

Roles of the A-Site Ca Dopant in Modifying Surface Properties of a Co-Based Perovskite Catalyst for Selective Oxidation of Cyclohexane

Roles of the A-Site Ca Dopant in Modifying Surface Properties of a Co-Based Perovskite Catalyst for Selective Oxidation of Cyclohexane

Aerobic Oxidation of Vanillyl Alcohol to Vanillin Over CeO₂‐Co₃O₄ Catalyst

Hydrodeoxygenation of cyclohexanol and cyclohexanone

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One-step production of adipic acid from cyclohexane over stable oxides (CeO2 & ZrO2) using O2: Enhanced oxidation activity in acidic medium

Cited by 4 publications

References 26 publications

Roles of the A-Site Ca Dopant in Modifying Surface Properties of a Co-Based Perovskite Catalyst for Selective Oxidation of Cyclohexane

Roles of the A-Site Ca Dopant in Modifying Surface Properties of a Co-Based Perovskite Catalyst for Selective Oxidation of Cyclohexane

Aerobic Oxidation of Vanillyl Alcohol to Vanillin Over CeO2‐Co3O4 Catalyst

Hydrodeoxygenation of cyclohexanol and cyclohexanone

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Aerobic Oxidation of Vanillyl Alcohol to Vanillin Over CeO₂‐Co₃O₄ Catalyst