On Oxygen Chemisorption for Characterization of Silica-Supported Vanadium Oxide Catalysts
Oxygen chemisorption experiments on prereduced silica-supported vanadia catalysts have been performed in order to determine the optimum conditions for measuring the relative dispersion of vanadium oxide on the silica substrate. By following the extent of vanadia reduction microgravimetrically, it is...
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| Veröffentlicht in: | Journal of Catalysis 1997-05, Vol.168 (1), p.110-116 |
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| container_end_page | 116 |
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| container_issue | 1 |
| container_start_page | 110 |
| container_title | Journal of Catalysis |
| container_volume | 168 |
| creator | Faraldos, M. Anderson, J.A. Bañares, M.A. Fierro, J.L.G. Weller, S.W. |
| description | Oxygen chemisorption experiments on prereduced silica-supported vanadia catalysts have been performed in order to determine the optimum conditions for measuring the relative dispersion of vanadium oxide on the silica substrate. By following the extent of vanadia reduction microgravimetrically, it is shown that an appropriate prereduction of the catalyst at 823 K under hydrogen is fundamental in obtaining a reproducible well-defined stoichiometrically reduced vanadium oxide system (V3+). AT 643 K the reduction process is very much slower and requires very long times in order to approach a plateau. Measurement of the binding energies of the V2p3/2core level spectra indicates that high-temperature oxygen chemisorption (643 K) results in a reoxidation of the prereduced vanadium oxide species within crystallites leading to an overestimation of the number of exposed vanadium sites. Chemisorption at low temperatures (298 or 195 K) does not affect the stoichiometrically reduced vanadium oxide species within crystallites, thus allowing the number of exposed surface vanadium sites to be measured. |
| doi_str_mv | 10.1006/jcat.1997.1627 |
| format | Article |
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By following the extent of vanadia reduction microgravimetrically, it is shown that an appropriate prereduction of the catalyst at 823 K under hydrogen is fundamental in obtaining a reproducible well-defined stoichiometrically reduced vanadium oxide system (V3+). AT 643 K the reduction process is very much slower and requires very long times in order to approach a plateau. Measurement of the binding energies of the V2p3/2core level spectra indicates that high-temperature oxygen chemisorption (643 K) results in a reoxidation of the prereduced vanadium oxide species within crystallites leading to an overestimation of the number of exposed vanadium sites. Chemisorption at low temperatures (298 or 195 K) does not affect the stoichiometrically reduced vanadium oxide species within crystallites, thus allowing the number of exposed surface vanadium sites to be measured.</description><identifier>ISSN: 0021-9517</identifier><identifier>EISSN: 1090-2694</identifier><identifier>DOI: 10.1006/jcat.1997.1627</identifier><identifier>CODEN: JCTLA5</identifier><language>eng</language><publisher>Amsterdam: Elsevier Inc</publisher><subject>BINDING ENERGY ; Catalysis ; CATALYSTS ; Catalysts: preparations and properties ; CATALYTIC EFFECTS ; CHEMISORPTION ; Chemistry ; Exact sciences and technology ; General and physical chemistry ; HYDROCARBONS ; MATERIALS SCIENCE ; OXIDATION ; OXYGEN ; SILICA ; SPECTRA ; SURFACE PROPERTIES ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry ; VANADIUM OXIDES</subject><ispartof>Journal of Catalysis, 1997-05, Vol.168 (1), p.110-116</ispartof><rights>1997 Academic Press</rights><rights>1997 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c377t-19aefa6491392dd04e64dc90023b8ed924f62c7572dce5e909d5ba45c9b42a953</citedby><cites>FETCH-LOGICAL-c377t-19aefa6491392dd04e64dc90023b8ed924f62c7572dce5e909d5ba45c9b42a953</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0021951797916274$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,881,3537,27901,27902,65534</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2710355$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/543389$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Faraldos, M.</creatorcontrib><creatorcontrib>Anderson, J.A.</creatorcontrib><creatorcontrib>Bañares, M.A.</creatorcontrib><creatorcontrib>Fierro, J.L.G.</creatorcontrib><creatorcontrib>Weller, S.W.</creatorcontrib><title>On Oxygen Chemisorption for Characterization of Silica-Supported Vanadium Oxide Catalysts</title><title>Journal of Catalysis</title><description>Oxygen chemisorption experiments on prereduced silica-supported vanadia catalysts have been performed in order to determine the optimum conditions for measuring the relative dispersion of vanadium oxide on the silica substrate. By following the extent of vanadia reduction microgravimetrically, it is shown that an appropriate prereduction of the catalyst at 823 K under hydrogen is fundamental in obtaining a reproducible well-defined stoichiometrically reduced vanadium oxide system (V3+). AT 643 K the reduction process is very much slower and requires very long times in order to approach a plateau. Measurement of the binding energies of the V2p3/2core level spectra indicates that high-temperature oxygen chemisorption (643 K) results in a reoxidation of the prereduced vanadium oxide species within crystallites leading to an overestimation of the number of exposed vanadium sites. Chemisorption at low temperatures (298 or 195 K) does not affect the stoichiometrically reduced vanadium oxide species within crystallites, thus allowing the number of exposed surface vanadium sites to be measured.</description><subject>BINDING ENERGY</subject><subject>Catalysis</subject><subject>CATALYSTS</subject><subject>Catalysts: preparations and properties</subject><subject>CATALYTIC EFFECTS</subject><subject>CHEMISORPTION</subject><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>HYDROCARBONS</subject><subject>MATERIALS SCIENCE</subject><subject>OXIDATION</subject><subject>OXYGEN</subject><subject>SILICA</subject><subject>SPECTRA</subject><subject>SURFACE PROPERTIES</subject><subject>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><subject>VANADIUM OXIDES</subject><issn>0021-9517</issn><issn>1090-2694</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><recordid>eNp1kM1LxDAQxYMouK5ePVfw2pqkTdscpfgFC3tYFTyV2WTqZuk2JcmK619va8Wbp4HHe_NmfoRcMpowSvObrYKQMCmLhOW8OCIzRiWNeS6zYzKjlLNYClackjPvt5QyJkQ5I2_LLlp-Ht6xi6oN7oy3rg_GdlFj3aCAAxXQmS_4EW0TrUxrFMSrfd9bF1BHr9CBNvvdsMZojCoI0B588OfkpIHW48XvnJOX-7vn6jFeLB-eqttFrNKiCDGTgA3kmWSp5FrTDPNMKzncm65L1JJnTc5VIQquFQqUVGqxhkwouc44SJHOydW01_pgaq9MQLVRtutQhVpkaVrKwZNMHuWs9w6bundmB-5QM1qP8OoRXj3Cq0d4Q-B6CvTgFbSNg04Z_5fiBaOpGLvLyYbDgx8G3diPnUJt3Fivrfmv4RsPq4OJ</recordid><startdate>19970501</startdate><enddate>19970501</enddate><creator>Faraldos, M.</creator><creator>Anderson, J.A.</creator><creator>Bañares, M.A.</creator><creator>Fierro, J.L.G.</creator><creator>Weller, S.W.</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>19970501</creationdate><title>On Oxygen Chemisorption for Characterization of Silica-Supported Vanadium Oxide Catalysts</title><author>Faraldos, M. ; Anderson, J.A. ; Bañares, M.A. ; Fierro, J.L.G. ; Weller, S.W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c377t-19aefa6491392dd04e64dc90023b8ed924f62c7572dce5e909d5ba45c9b42a953</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><topic>BINDING ENERGY</topic><topic>Catalysis</topic><topic>CATALYSTS</topic><topic>Catalysts: preparations and properties</topic><topic>CATALYTIC EFFECTS</topic><topic>CHEMISORPTION</topic><topic>Chemistry</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>HYDROCARBONS</topic><topic>MATERIALS SCIENCE</topic><topic>OXIDATION</topic><topic>OXYGEN</topic><topic>SILICA</topic><topic>SPECTRA</topic><topic>SURFACE PROPERTIES</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><topic>VANADIUM OXIDES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Faraldos, M.</creatorcontrib><creatorcontrib>Anderson, J.A.</creatorcontrib><creatorcontrib>Bañares, M.A.</creatorcontrib><creatorcontrib>Fierro, J.L.G.</creatorcontrib><creatorcontrib>Weller, S.W.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Journal of Catalysis</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Faraldos, M.</au><au>Anderson, J.A.</au><au>Bañares, M.A.</au><au>Fierro, J.L.G.</au><au>Weller, S.W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>On Oxygen Chemisorption for Characterization of Silica-Supported Vanadium Oxide Catalysts</atitle><jtitle>Journal of Catalysis</jtitle><date>1997-05-01</date><risdate>1997</risdate><volume>168</volume><issue>1</issue><spage>110</spage><epage>116</epage><pages>110-116</pages><issn>0021-9517</issn><eissn>1090-2694</eissn><coden>JCTLA5</coden><abstract>Oxygen chemisorption experiments on prereduced silica-supported vanadia catalysts have been performed in order to determine the optimum conditions for measuring the relative dispersion of vanadium oxide on the silica substrate. By following the extent of vanadia reduction microgravimetrically, it is shown that an appropriate prereduction of the catalyst at 823 K under hydrogen is fundamental in obtaining a reproducible well-defined stoichiometrically reduced vanadium oxide system (V3+). AT 643 K the reduction process is very much slower and requires very long times in order to approach a plateau. Measurement of the binding energies of the V2p3/2core level spectra indicates that high-temperature oxygen chemisorption (643 K) results in a reoxidation of the prereduced vanadium oxide species within crystallites leading to an overestimation of the number of exposed vanadium sites. Chemisorption at low temperatures (298 or 195 K) does not affect the stoichiometrically reduced vanadium oxide species within crystallites, thus allowing the number of exposed surface vanadium sites to be measured.</abstract><cop>Amsterdam</cop><pub>Elsevier Inc</pub><doi>10.1006/jcat.1997.1627</doi><tpages>7</tpages></addata></record> |
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| identifier | ISSN: 0021-9517 |
| ispartof | Journal of Catalysis, 1997-05, Vol.168 (1), p.110-116 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | BINDING ENERGY Catalysis CATALYSTS Catalysts: preparations and properties CATALYTIC EFFECTS CHEMISORPTION Chemistry Exact sciences and technology General and physical chemistry HYDROCARBONS MATERIALS SCIENCE OXIDATION OXYGEN SILICA SPECTRA SURFACE PROPERTIES Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry VANADIUM OXIDES |
| title | On Oxygen Chemisorption for Characterization of Silica-Supported Vanadium Oxide Catalysts |
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