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  Identification of Active Sites in the Catalytic Oxidation of 2‐Propanol over Co1+xFe2‐xO4 Spinel Oxides at Solid/Liquid and Solid/Gas Interfaces

Falk, T., Budiyanto, E., Dreyer, M., Pflieger, C., Waffel, D., Büker, J., et al. (2021). Identification of Active Sites in the Catalytic Oxidation of 2‐Propanol over Co1+xFe2‐xO4 Spinel Oxides at Solid/Liquid and Solid/Gas Interfaces. ChemCatChem. doi:10.1002/cctc.202100352.

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 Creators:
Falk, Tobias1, Author
Budiyanto, Eko2, Author              
Dreyer, Maik3, Author
Pflieger, Christin1, Author
Waffel, Daniel1, Author
Büker, Julia1, Author
Weidenthaler, Claudia4, Author              
Ortega, Klaus Friedel5, Author
Behrens, Malte5, Author
Tüysüz, Harun2, Author              
Muhler, Martin1, Author
Peng, Baoxiang1, Author
Affiliations:
1Ruhr-Universitat Bochum, Laboratory of Industrial Chemistry, Universitätsstr. 150, 44801 Bochum, Germany, ou_persistent22              
2Research Group Tüysüz, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950290              
3Universitat Duisburg-Essen, Faculty of Chemistry, Germany, ou_persistent22              
4Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              
5Christian-Albrechts-Universitat zu Kiel, Institute of Inorganic Chemistry, Kiel, Germany, ou_persistent22              

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Free keywords: selective oxidation; liquid phase; nanocasting; cobalt iron oxide; cobalt ensemble
 Abstract: A series of Co1+xFe2‐xO4 (0 ≤ x ≤ 2) spinel nanowires was synthesized by nanocasting using SBA‐15 silica as hard template, which was characterized by X‐ray powder diffraction, X‐ray photoelectron spectroscopy, and transmission electron microscopy. The Co1+xFe2‐xO4 spinels were applied in the aerobic oxidation of aqueous 2‐propanol solutions to systematically study the influence of exposed Co and Fe cations on the catalytic properties. The activity of the catalysts was found to depend strongly on the Co content, showing an exponential increase of the reaction rate with increasing Co content. Ensembles of Co3+ cus (coordinatively unsaturated) sites were identified as the active sites for selective 2‐propanol oxidation, which are assumed to consist of more than six Co ions. In addition, gas‐phase oxidation with and without water vapor co‐feeding was performed to achieve a comparison with liquid‐phase oxidation kinetics. An apparent activation energy of 94 kJ mol‐1 was determined for 2‐propanol oxidation over Co3O4 in the liquid phase, which is in good agreement with the gas‐phase oxidation in the presence of water vapor. In contrast to gas‐phase conditions, the catalysts showed high stability and reusability in the aqueous phase with constant conversion in three consecutive runs.

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Language(s): eng - English
 Dates: 2021-03-062021-04-02
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/cctc.202100352
 Degree: -

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Title: ChemCatChem
  Abbreviation : ChemCatChem
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 1867-3880
CoNE: https://pure.mpg.de/cone/journals/resource/1867-3880