Structural and electrical properties of cerium tungstate: Application to methane conversion
The catalytic efficiency as well as the electrical conduction mechanism of Ce2(WO4)3 powders synthetized for the oxidation of methane were investigated. Total and partial oxidation reactions were observed in the temperature range between 600 and 750 °C under CH4/dry air flux, for low CH4 concentrati...
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Veröffentlicht in: | Ceramics international 2020-04, Vol.46 (6), p.8021-8030 |
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description | The catalytic efficiency as well as the electrical conduction mechanism of Ce2(WO4)3 powders synthetized for the oxidation of methane were investigated. Total and partial oxidation reactions were observed in the temperature range between 600 and 750 °C under CH4/dry air flux, for low CH4 concentrations. The electrical conduction mechanism is based on electron tunneling at low temperature ( |
doi_str_mv | 10.1016/j.ceramint.2019.12.026 |
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Total and partial oxidation reactions were observed in the temperature range between 600 and 750 °C under CH4/dry air flux, for low CH4 concentrations. The electrical conduction mechanism is based on electron tunneling at low temperature (<650 °C) and hopping over an ion barrier at high temperature, which favors the catalytic oxidation of CH4 in air; these mechanisms occur during the partial and total oxidation under weak gas flow. The occurrence of these types of conduction mechanism was related both to the distorted monoclinic structure of Ce2(WO4)3 and to the larger structural cavities, as evidenced respectively by X-ray diffraction analyses (Rietveld analyses) and high-resolution transmission electron microscopy. The oxidation state of cerium is 3 + in the compound, as revealed by XPS investigations.</description><identifier>ISSN: 0272-8842</identifier><identifier>EISSN: 1873-3956</identifier><identifier>DOI: 10.1016/j.ceramint.2019.12.026</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Catalysis ; Chemical Sciences ; Conduction mechanism ; Electron microscopy ; Material chemistry ; Methane oxidation ; Tungstate material</subject><ispartof>Ceramics international, 2020-04, Vol.46 (6), p.8021-8030</ispartof><rights>2019 Elsevier Ltd and Techna Group S.r.l.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c394t-dcbef618ff7d04fc3baa2000a5d3a1012f436e9309e0017ac3c523020f74f8763</citedby><cites>FETCH-LOGICAL-c394t-dcbef618ff7d04fc3baa2000a5d3a1012f436e9309e0017ac3c523020f74f8763</cites><orcidid>0000-0002-5114-961X ; 0000-0003-4949-9305 ; 0000-0003-4649-9305</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0272884219335035$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,776,780,881,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttps://hal.science/hal-02477686$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Damascena dos Passos, Rafael Hernandez</creatorcontrib><creatorcontrib>Pereira de Souza, Carlson</creatorcontrib><creatorcontrib>Bernard-Nicod, Coline</creatorcontrib><creatorcontrib>Leroux, Christine</creatorcontrib><creatorcontrib>Arab, Madjid</creatorcontrib><title>Structural and electrical properties of cerium tungstate: Application to methane conversion</title><title>Ceramics international</title><description>The catalytic efficiency as well as the electrical conduction mechanism of Ce2(WO4)3 powders synthetized for the oxidation of methane were investigated. Total and partial oxidation reactions were observed in the temperature range between 600 and 750 °C under CH4/dry air flux, for low CH4 concentrations. The electrical conduction mechanism is based on electron tunneling at low temperature (<650 °C) and hopping over an ion barrier at high temperature, which favors the catalytic oxidation of CH4 in air; these mechanisms occur during the partial and total oxidation under weak gas flow. The occurrence of these types of conduction mechanism was related both to the distorted monoclinic structure of Ce2(WO4)3 and to the larger structural cavities, as evidenced respectively by X-ray diffraction analyses (Rietveld analyses) and high-resolution transmission electron microscopy. The oxidation state of cerium is 3 + in the compound, as revealed by XPS investigations.</description><subject>Catalysis</subject><subject>Chemical Sciences</subject><subject>Conduction mechanism</subject><subject>Electron microscopy</subject><subject>Material chemistry</subject><subject>Methane oxidation</subject><subject>Tungstate material</subject><issn>0272-8842</issn><issn>1873-3956</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFUMtKAzEUDaJgrf6CZOtixjymyYwrS1ErFFyoKxchzdzYlHmRZAr-vRmqbl1d7uU87jkIXVOSU0LF7T434HXrupgzQqucspwwcYJmtJQ849VCnKIZYZJlZVmwc3QRwp4kYlWQGfp4jX40cfS6wbqrMTRgoncmrYPvB_DRQcC9xcnDjS2OY_cZoo5wh5fD0CRgdH2HY49biDvdATZ9dwAf0vUSnVndBLj6mXP0_vjwtlpnm5en59VykxleFTGrzRasoKW1siaFNXyrNSOE6EXNdUrIbMEFVJxUkN6W2nCzYJwwYmVhSyn4HN0cdXe6UYN3rfZfqtdOrZcbNd0IK6QUpTjQhBVHrPF9CB7sH4ESNdWp9uq3TjXVqShL_Mnk_kiElOTgwKtgHHQGaudTZaru3X8S3xVvgyA</recordid><startdate>20200415</startdate><enddate>20200415</enddate><creator>Damascena dos Passos, Rafael Hernandez</creator><creator>Pereira de Souza, Carlson</creator><creator>Bernard-Nicod, Coline</creator><creator>Leroux, Christine</creator><creator>Arab, Madjid</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-5114-961X</orcidid><orcidid>https://orcid.org/0000-0003-4949-9305</orcidid><orcidid>https://orcid.org/0000-0003-4649-9305</orcidid></search><sort><creationdate>20200415</creationdate><title>Structural and electrical properties of cerium tungstate: Application to methane conversion</title><author>Damascena dos Passos, Rafael Hernandez ; Pereira de Souza, Carlson ; Bernard-Nicod, Coline ; Leroux, Christine ; Arab, Madjid</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c394t-dcbef618ff7d04fc3baa2000a5d3a1012f436e9309e0017ac3c523020f74f8763</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Catalysis</topic><topic>Chemical Sciences</topic><topic>Conduction mechanism</topic><topic>Electron microscopy</topic><topic>Material chemistry</topic><topic>Methane oxidation</topic><topic>Tungstate material</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Damascena dos Passos, Rafael Hernandez</creatorcontrib><creatorcontrib>Pereira de Souza, Carlson</creatorcontrib><creatorcontrib>Bernard-Nicod, Coline</creatorcontrib><creatorcontrib>Leroux, Christine</creatorcontrib><creatorcontrib>Arab, Madjid</creatorcontrib><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Ceramics international</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Damascena dos Passos, Rafael Hernandez</au><au>Pereira de Souza, Carlson</au><au>Bernard-Nicod, Coline</au><au>Leroux, Christine</au><au>Arab, Madjid</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Structural and electrical properties of cerium tungstate: Application to methane conversion</atitle><jtitle>Ceramics international</jtitle><date>2020-04-15</date><risdate>2020</risdate><volume>46</volume><issue>6</issue><spage>8021</spage><epage>8030</epage><pages>8021-8030</pages><issn>0272-8842</issn><eissn>1873-3956</eissn><abstract>The catalytic efficiency as well as the electrical conduction mechanism of Ce2(WO4)3 powders synthetized for the oxidation of methane were investigated. Total and partial oxidation reactions were observed in the temperature range between 600 and 750 °C under CH4/dry air flux, for low CH4 concentrations. The electrical conduction mechanism is based on electron tunneling at low temperature (<650 °C) and hopping over an ion barrier at high temperature, which favors the catalytic oxidation of CH4 in air; these mechanisms occur during the partial and total oxidation under weak gas flow. The occurrence of these types of conduction mechanism was related both to the distorted monoclinic structure of Ce2(WO4)3 and to the larger structural cavities, as evidenced respectively by X-ray diffraction analyses (Rietveld analyses) and high-resolution transmission electron microscopy. 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subjects | Catalysis Chemical Sciences Conduction mechanism Electron microscopy Material chemistry Methane oxidation Tungstate material |
title | Structural and electrical properties of cerium tungstate: Application to methane conversion |
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