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Ostovari Moghaddam A, Mehrabi-Kalajahi S, Qi X, Salari R, Fereidonnejad R, Abdollahzadeh A, Uchaev DA, Kazakova EA, Varfolomeev MA, Cabot A, Vasenko AS, Trofimov EA. La(FeCuMnMgTi)O 3 High-Entropy Oxide Nanoparticles as Highly Efficient Catalysts for Solvent-Free Aerobic Oxidation of Benzyl Alcohol. J Phys Chem Lett 2024; 15:7577-7583. [PMID: 39024539 DOI: 10.1021/acs.jpclett.4c01852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
In this work, a solid-state method for the synthesis of perovskite La(FeCuMnMgTi)O3 high-entropy oxide (HEO) nanoparticles is detailed. Additionally, the high performance of these nanoparticles as catalysts in the aerobic and solvent-free oxidation of benzyl alcohol is demonstrated. The structural features of HEO nanoparticles are studied by X-ray diffraction and high-resolution transmission electron microscopy. The La(FeCuMnMgTi)O3 nanoparticles demonstrate excellent benzyl alcohol conversion rates and selectivity for benzaldehyde, reaching 10.6% conversion and 52.8% selectivity after reaction for only 4 h and ≤75.6% conversion after 24 h. In addition, the as-prepared HEO catalyst displays robust stability in benzyl alcohol oxidation. Density functional theory calculations demonstrate that the adsorption energy of benzaldehyde on the HEO surface is lower than that of the benzoic acid. This, in turn, hinders the gradual conversion of benzaldehyde to benzoic acid on the surface of HEO and retains benzaldehyde as the main product.
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Affiliation(s)
- Ahmad Ostovari Moghaddam
- Department of Materials Science, Physical and Chemical Properties of Materials, South Ural State University, 76 Lenin Ave, Chelyabinsk 454080, Russia
| | - Seyedsaeed Mehrabi-Kalajahi
- Department of Materials Science, Physical and Chemical Properties of Materials, South Ural State University, 76 Lenin Ave, Chelyabinsk 454080, Russia
- Department of Petroleum Engineering, Kazan Federal University, Kazan 420008, Russia
| | - Xueqiang Qi
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
| | - Rana Salari
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran
| | - Rahele Fereidonnejad
- Department of Materials Science, Physical and Chemical Properties of Materials, South Ural State University, 76 Lenin Ave, Chelyabinsk 454080, Russia
| | - Amin Abdollahzadeh
- School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran 16846-13114, Iran
| | - Daniil A Uchaev
- Department of Materials Science, Physical and Chemical Properties of Materials, South Ural State University, 76 Lenin Ave, Chelyabinsk 454080, Russia
| | - Elena A Kazakova
- Department of Biochemistry, Sechenov First Moscow State Medical University, 119991 Moscow, Russia
| | | | - Andreu Cabot
- Catalonia Institute for Energy Research - IREC, 08930 Sant Adrià de Besòs, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | | | - Evgeny A Trofimov
- Department of Materials Science, Physical and Chemical Properties of Materials, South Ural State University, 76 Lenin Ave, Chelyabinsk 454080, Russia
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Song X, Basheer C, Zare RN. Water Microdroplets-Initiated Methane Oxidation. J Am Chem Soc 2023; 145:27198-27204. [PMID: 38054976 DOI: 10.1021/jacs.3c08643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
The special redox reactivity of water microdroplets causes "mild ignition" of methane gas to form methane oxygenates. The C(sp3)-H bond of methane can be activated by the hydroxyl radical (OH·) or the hydrogen radical (H·) across the air-water interface (AWI) of microdroplets to generate the methyl radical (CH3·). Once CH3· is formed, it undergoes free-radical reactions with O2 in the air, excessive OH· and H· across the AWI, and H2O2 present at the AWI and generated CH3· itself to produce methanol and other species. Production of the methanol and other oxygenates was confirmed by gas chromatography, mass spectrometry, and 1H- and 13C-nuclear magnetic resonance. Formic acid, acetic acid, ethanol, carbon dioxide, and methyl peroxide were also detected as methane oxidation byproducts. This water microdroplet-initiated oxidation process can be further enhanced under ultrasonication to yield 2.66 ± 0.77 mM methanol conversion from the methane gas in a single spray run for 30 min, with a selectivity of 19.2% compared with all other oxygenated species.
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Affiliation(s)
- Xiaowei Song
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Chanbasha Basheer
- Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Richard N Zare
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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