Development and characterization of silica supported cobalt oxides for ethanol oxidation using different preparation methods
Cobalt oxide in spinel structure (Co3O4) is an efficient catalyst for ethanol oxidation due to its potential as an oxygen source. To enhance the catalytic performance, Co3O4 is dispersed on silica (SiO2). The degree of dispersion and form of oxides on the support depend on the preparation method. Th...
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Published in | Radiation physics and chemistry (Oxford, England : 1993) Vol. 171; p. 108718 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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Elsevier Ltd
01.06.2020
Elsevier BV |
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Abstract | Cobalt oxide in spinel structure (Co3O4) is an efficient catalyst for ethanol oxidation due to its potential as an oxygen source. To enhance the catalytic performance, Co3O4 is dispersed on silica (SiO2). The degree of dispersion and form of oxides on the support depend on the preparation method. The objective of this work is to compare physicochemical properties and catalytic performance in ethanol oxidation of silica-supported cobalt catalysts from different preparation methods. The catalysts were prepared by incipient wetness impregnation (IP), precipitation with reverse micelle (RM), and precipitation with NH4OH (PN) methods. The forms and dispersion of cobalt species were investigated by X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and X-ray photoelectron spectroscopy (XPS). The cobalt species from RM and IP methods were mainly Co3O4, but that from PN method was the mixed phases of Co3O4, CoO and Co2SiO4. The RM method provided the best dispersion of Co3O4, surface Co3+ and lattice O2− on SiO2. Consequently, the catalyst from RM method provided the highest ethanol conversion and CO2 yield from all temperature ranges.
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•Cobalt oxides supported on silica as catalysts were prepared by three methods.•Forms of cobalt were studied by X-ray absorption and photoelectron spectroscopies.•Reverse micelle and impregnation gave mainly Co3O4 but not for precipitation by NH4OH.•The reverse micelle method provided the best dispersion of Co3O4 on SiO2.•The reverse micelle method had the highest ethanol conversion and CO2 yield. |
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AbstractList | Cobalt oxide in spinel structure (Co3O4) is an efficient catalyst for ethanol oxidation due to its potential as an oxygen source. To enhance the catalytic performance, Co3O4 is dispersed on silica (SiO2). The degree of dispersion and form of oxides on the support depend on the preparation method. The objective of this work is to compare physicochemical properties and catalytic performance in ethanol oxidation of silica-supported cobalt catalysts from different preparation methods. The catalysts were prepared by incipient wetness impregnation (IP), precipitation with reverse micelle (RM), and precipitation with NH4OH (PN) methods. The forms and dispersion of cobalt species were investigated by X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and X-ray photoelectron spectroscopy (XPS). The cobalt species from RM and IP methods were mainly Co3O4, but that from PN method was the mixed phases of Co3O4, CoO and Co2SiO4. The RM method provided the best dispersion of Co3O4, surface Co3+ and lattice O2− on SiO2. Consequently, the catalyst from RM method provided the highest ethanol conversion and CO2 yield from all temperature ranges. Cobalt oxide in spinel structure (Co3O4) is an efficient catalyst for ethanol oxidation due to its potential as an oxygen source. To enhance the catalytic performance, Co3O4 is dispersed on silica (SiO2). The degree of dispersion and form of oxides on the support depend on the preparation method. The objective of this work is to compare physicochemical properties and catalytic performance in ethanol oxidation of silica-supported cobalt catalysts from different preparation methods. The catalysts were prepared by incipient wetness impregnation (IP), precipitation with reverse micelle (RM), and precipitation with NH4OH (PN) methods. The forms and dispersion of cobalt species were investigated by X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and X-ray photoelectron spectroscopy (XPS). The cobalt species from RM and IP methods were mainly Co3O4, but that from PN method was the mixed phases of Co3O4, CoO and Co2SiO4. The RM method provided the best dispersion of Co3O4, surface Co3+ and lattice O2− on SiO2. Consequently, the catalyst from RM method provided the highest ethanol conversion and CO2 yield from all temperature ranges. [Display omitted] •Cobalt oxides supported on silica as catalysts were prepared by three methods.•Forms of cobalt were studied by X-ray absorption and photoelectron spectroscopies.•Reverse micelle and impregnation gave mainly Co3O4 but not for precipitation by NH4OH.•The reverse micelle method provided the best dispersion of Co3O4 on SiO2.•The reverse micelle method had the highest ethanol conversion and CO2 yield. |
ArticleNumber | 108718 |
Author | Khemthong, P. Chanlek, N. Kidkhunthod, P. Wittayakun, J. Prayoonpokarach, S. Osakoo, N. Roessner, F. |
Author_xml | – sequence: 1 givenname: N. surname: Osakoo fullname: Osakoo, N. email: nattawut.o@g.sut.ac.th organization: School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand – sequence: 2 givenname: P. surname: Khemthong fullname: Khemthong, P. organization: National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120, Thailand – sequence: 3 givenname: F. surname: Roessner fullname: Roessner, F. organization: Technische Chemie II, Carl von Ossietzky Universität Oldenburg, Oldenburg, D-26111, Germany – sequence: 4 givenname: P. surname: Kidkhunthod fullname: Kidkhunthod, P. organization: Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, 30000, Thailand – sequence: 5 givenname: N. surname: Chanlek fullname: Chanlek, N. organization: Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, 30000, Thailand – sequence: 6 givenname: S. surname: Prayoonpokarach fullname: Prayoonpokarach, S. organization: School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand – sequence: 7 givenname: J. surname: Wittayakun fullname: Wittayakun, J. email: jatuporn@sut.ac.th organization: School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand |
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Snippet | Cobalt oxide in spinel structure (Co3O4) is an efficient catalyst for ethanol oxidation due to its potential as an oxygen source. To enhance the catalytic... |
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SubjectTerms | Ammonium hydroxide Catalysts Cobalt Cobalt oxides Dispersion Ethanol Ethanol oxidation Fine structure Methods Oxidation Photoelectrons Reverse micelle Reverse micelles Silica Silicon dioxide X ray absorption X ray photoelectron spectroscopy |
Title | Development and characterization of silica supported cobalt oxides for ethanol oxidation using different preparation methods |
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