Molybdenum Dopped Copper Ferrites as Active Catalysts for Alcohols Oxidative Coupling
Copper ferrites dopped with molybdenum were studied in an oxidative coupling reaction between methanol and ethanol in the gas phase. The catalysts have been characterized by X-ray diffraction, where the presence of ferrite, magnetite, and tenorite phases was observed; scanning electron microscopy; U...
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| Veröffentlicht in: | Materials 2019-06, Vol.12 (11), p.1871 |
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| creator | Mitran, Gheorghiţa Chen, Shaojiang Seo, Dong-Kyun |
| description | Copper ferrites dopped with molybdenum were studied in an oxidative coupling reaction between methanol and ethanol in the gas phase. The catalysts have been characterized by X-ray diffraction, where the presence of ferrite, magnetite, and tenorite phases was observed; scanning electron microscopy; UV-Vis spectroscopy; and Fourier-transform infrared spectroscopy, which highlighted the presence of octahedral coordination of isolated molybdena species. The catalyst with the highest activity in this reaction and with the highest selectivity to hydroxyacetone is the one that presents Lewis sites with weak acidity. The methyl and ethyl acetate selectivities are directly proportional to the Cu/Fe ratio. It has been observed that the presence of reduced copper sites is responsible for the selectivity in esters, while the presence of reduced iron and molybdenum sites is responsible for the acetol production. |
| doi_str_mv | 10.3390/ma12111871 |
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The catalysts have been characterized by X-ray diffraction, where the presence of ferrite, magnetite, and tenorite phases was observed; scanning electron microscopy; UV-Vis spectroscopy; and Fourier-transform infrared spectroscopy, which highlighted the presence of octahedral coordination of isolated molybdena species. The catalyst with the highest activity in this reaction and with the highest selectivity to hydroxyacetone is the one that presents Lewis sites with weak acidity. The methyl and ethyl acetate selectivities are directly proportional to the Cu/Fe ratio. It has been observed that the presence of reduced copper sites is responsible for the selectivity in esters, while the presence of reduced iron and molybdenum sites is responsible for the acetol production.</description><identifier>ISSN: 1996-1944</identifier><identifier>EISSN: 1996-1944</identifier><identifier>DOI: 10.3390/ma12111871</identifier><identifier>PMID: 31185628</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Alcohol ; Alcohols ; Catalysts ; Copper ; Copper ferrite ; Coupling ; Esters ; Ethanol ; Ethyl acetate ; Fourier transforms ; Hydrogenation ; Infrared spectroscopy ; Iron ; Molybdenum ; Particle size ; Selectivity ; Spectrum analysis ; Vapor phases</subject><ispartof>Materials, 2019-06, Vol.12 (11), p.1871</ispartof><rights>2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 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The catalysts have been characterized by X-ray diffraction, where the presence of ferrite, magnetite, and tenorite phases was observed; scanning electron microscopy; UV-Vis spectroscopy; and Fourier-transform infrared spectroscopy, which highlighted the presence of octahedral coordination of isolated molybdena species. The catalyst with the highest activity in this reaction and with the highest selectivity to hydroxyacetone is the one that presents Lewis sites with weak acidity. The methyl and ethyl acetate selectivities are directly proportional to the Cu/Fe ratio. It has been observed that the presence of reduced copper sites is responsible for the selectivity in esters, while the presence of reduced iron and molybdenum sites is responsible for the acetol production.</description><subject>Alcohol</subject><subject>Alcohols</subject><subject>Catalysts</subject><subject>Copper</subject><subject>Copper ferrite</subject><subject>Coupling</subject><subject>Esters</subject><subject>Ethanol</subject><subject>Ethyl acetate</subject><subject>Fourier transforms</subject><subject>Hydrogenation</subject><subject>Infrared spectroscopy</subject><subject>Iron</subject><subject>Molybdenum</subject><subject>Particle size</subject><subject>Selectivity</subject><subject>Spectrum analysis</subject><subject>Vapor phases</subject><issn>1996-1944</issn><issn>1996-1944</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpdkU1LxDAQhoMoKqsXf4AEvIhQzUeTJhdhWV0VlL3oOaTtrFbSpibt4v57u-y6fsxlBuaZl3d4ETqh5JJzTa5qSxmlVGV0Bx1SrWVCdZru_poP0HGM72Qozqlieh8d8OFASKYO0cuTd8u8hKav8Y1vWyjxZNUCnkIIVQcR24jHRVctAE9sZ90ydhHPfcBjV_g37yKefValXQO-b13VvB6hvbl1EY43fYReprfPk_vkcXb3MBk_JkVKZJfYUkkutdSCKaA5SZWmuU6JKCUwwjIQmhIQOeQZSJvaDBTMMyZ5XkA6cHyErte6bZ_XUBbQdME604aqtmFpvK3M301TvZlXvzBSEsq0GgTONwLBf_QQO1NXsQDnbAO-j4YxSVmmCeUDevYPffd9aIb3DBOpkkIIshK8WFNF8DEGmG_NUGJWgZmfwAb49Lf9LfodD_8Cd9CQLQ</recordid><startdate>20190610</startdate><enddate>20190610</enddate><creator>Mitran, Gheorghiţa</creator><creator>Chen, Shaojiang</creator><creator>Seo, Dong-Kyun</creator><general>MDPI AG</general><general>MDPI</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7X8</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0001-9201-4079</orcidid></search><sort><creationdate>20190610</creationdate><title>Molybdenum Dopped Copper Ferrites as Active Catalysts for Alcohols Oxidative Coupling</title><author>Mitran, Gheorghiţa ; 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| subjects | Alcohol Alcohols Catalysts Copper Copper ferrite Coupling Esters Ethanol Ethyl acetate Fourier transforms Hydrogenation Infrared spectroscopy Iron Molybdenum Particle size Selectivity Spectrum analysis Vapor phases |
| title | Molybdenum Dopped Copper Ferrites as Active Catalysts for Alcohols Oxidative Coupling |
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