Magneto-chemical character studies of iron-moly and iron-cobalt-moly catalysts
Iron, cobalt and molybdenum compounds are extensively used for the conversion of coal to liquid fuels. To examine the correlations between catalytic, magnetic, and spectroscopic properties, we investigated the Zero-field Nuclear Magnetic Resonance spectra of cobalt. Mossbauer spectra of iron, FTIR s...
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| Veröffentlicht in: | IEEE transactions on magnetics 2001-07, Vol.37 (4), p.2929-2931 |
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| creator | Akundi, M.A. Zhang, J. Gibbs, M. Watson, M.M. Murty, A.N. Naidu, S.V. Bruster, E. Turner, L. Waller, F.J. |
| description | Iron, cobalt and molybdenum compounds are extensively used for the conversion of coal to liquid fuels. To examine the correlations between catalytic, magnetic, and spectroscopic properties, we investigated the Zero-field Nuclear Magnetic Resonance spectra of cobalt. Mossbauer spectra of iron, FTIR spectra and magnetic character of the composite for a series of Fe/MoO/sub 3/ and Fe/Co/MoO/sub 3/ catalysts with different inter-metallic ratios and metal loadings. All the precursors are paramagnetic according to the magnetization data. Mossbauer results show that in the precursors Fe is in Fe/sup 3+/ state. FTIR spectra reveal bands due to monodentate and bidentate structures of Fe-MoO/sub 3/ and Co-MoO/sub 3/. NMR spectra support these findings indicating strong inter-metallic interaction between Co and MoO/sub 3/. FTIR results show that exposure to CO or syngas (CO+H/sub 2/), leads to dissociation of metal-MoO/sub 3/ structures and Mossbauer data shows the presence of excess lattice charge with iron in the Fe/sup 2+/ state. Only a minute portion of the composite gets reduced to metallic state. Cobalt seems to form cobalt carbonyl structures, while carbide formations seem to occur with iron. Lack of free metal sites seems to be the reason for the poor conversion of CO observed in the catalytic runs. |
| doi_str_mv | 10.1109/20.951350 |
| format | Article |
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To examine the correlations between catalytic, magnetic, and spectroscopic properties, we investigated the Zero-field Nuclear Magnetic Resonance spectra of cobalt. Mossbauer spectra of iron, FTIR spectra and magnetic character of the composite for a series of Fe/MoO/sub 3/ and Fe/Co/MoO/sub 3/ catalysts with different inter-metallic ratios and metal loadings. All the precursors are paramagnetic according to the magnetization data. Mossbauer results show that in the precursors Fe is in Fe/sup 3+/ state. FTIR spectra reveal bands due to monodentate and bidentate structures of Fe-MoO/sub 3/ and Co-MoO/sub 3/. NMR spectra support these findings indicating strong inter-metallic interaction between Co and MoO/sub 3/. FTIR results show that exposure to CO or syngas (CO+H/sub 2/), leads to dissociation of metal-MoO/sub 3/ structures and Mossbauer data shows the presence of excess lattice charge with iron in the Fe/sup 2+/ state. Only a minute portion of the composite gets reduced to metallic state. Cobalt seems to form cobalt carbonyl structures, while carbide formations seem to occur with iron. Lack of free metal sites seems to be the reason for the poor conversion of CO observed in the catalytic runs.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/20.951350</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Catalysis ; Catalysts ; Catalysts: preparations and properties ; Chemistry ; Cobalt ; Exact sciences and technology ; Fuels ; General and physical chemistry ; Iron ; Lead ; Magnetic properties ; Magnetic resonance ; Magnetism ; Magnetization ; Mossbauer effect ; NMR ; Nuclear magnetic resonance ; Paramagnetic materials ; Precursors ; Spectra ; Spectroscopy ; Spectrum analysis ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><ispartof>IEEE transactions on magnetics, 2001-07, Vol.37 (4), p.2929-2931</ispartof><rights>2002 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2001</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c428t-b9e59763db4006e26012f690f3e5b6e96a166ec6650fb81b5a64c0abac9b21413</citedby><cites>FETCH-LOGICAL-c428t-b9e59763db4006e26012f690f3e5b6e96a166ec6650fb81b5a64c0abac9b21413</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/951350$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>309,310,314,776,780,785,786,792,23909,23910,25118,27901,27902,54733</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/951350$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=14098133$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Akundi, M.A.</creatorcontrib><creatorcontrib>Zhang, J.</creatorcontrib><creatorcontrib>Gibbs, M.</creatorcontrib><creatorcontrib>Watson, M.M.</creatorcontrib><creatorcontrib>Murty, A.N.</creatorcontrib><creatorcontrib>Naidu, S.V.</creatorcontrib><creatorcontrib>Bruster, E.</creatorcontrib><creatorcontrib>Turner, L.</creatorcontrib><creatorcontrib>Waller, F.J.</creatorcontrib><title>Magneto-chemical character studies of iron-moly and iron-cobalt-moly catalysts</title><title>IEEE transactions on magnetics</title><addtitle>TMAG</addtitle><description>Iron, cobalt and molybdenum compounds are extensively used for the conversion of coal to liquid fuels. To examine the correlations between catalytic, magnetic, and spectroscopic properties, we investigated the Zero-field Nuclear Magnetic Resonance spectra of cobalt. Mossbauer spectra of iron, FTIR spectra and magnetic character of the composite for a series of Fe/MoO/sub 3/ and Fe/Co/MoO/sub 3/ catalysts with different inter-metallic ratios and metal loadings. All the precursors are paramagnetic according to the magnetization data. Mossbauer results show that in the precursors Fe is in Fe/sup 3+/ state. FTIR spectra reveal bands due to monodentate and bidentate structures of Fe-MoO/sub 3/ and Co-MoO/sub 3/. NMR spectra support these findings indicating strong inter-metallic interaction between Co and MoO/sub 3/. FTIR results show that exposure to CO or syngas (CO+H/sub 2/), leads to dissociation of metal-MoO/sub 3/ structures and Mossbauer data shows the presence of excess lattice charge with iron in the Fe/sup 2+/ state. Only a minute portion of the composite gets reduced to metallic state. Cobalt seems to form cobalt carbonyl structures, while carbide formations seem to occur with iron. Lack of free metal sites seems to be the reason for the poor conversion of CO observed in the catalytic runs.</description><subject>Catalysis</subject><subject>Catalysts</subject><subject>Catalysts: preparations and properties</subject><subject>Chemistry</subject><subject>Cobalt</subject><subject>Exact sciences and technology</subject><subject>Fuels</subject><subject>General and physical chemistry</subject><subject>Iron</subject><subject>Lead</subject><subject>Magnetic properties</subject><subject>Magnetic resonance</subject><subject>Magnetism</subject><subject>Magnetization</subject><subject>Mossbauer effect</subject><subject>NMR</subject><subject>Nuclear magnetic resonance</subject><subject>Paramagnetic materials</subject><subject>Precursors</subject><subject>Spectra</subject><subject>Spectroscopy</subject><subject>Spectrum analysis</subject><subject>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNqN0U1P3DAQBmCrAqkL9NBrTxFSQRxCZxLbsY9oxUelhV7aczTxTkpW2Xixs4f99xiyaiUOtCdr7MevRx4hPiNcIoL9VsClVVgq-CBmaCXmANoeiBkAmtxKLT-KoxhXqZQKYSYe7un3wKPP3SOvO0d95h4pkBs5ZHHcLjuOmW-zLvghX_t-l9GwnCrnG-rHadPRSP0ujvFEHLbUR_60X4_Fr5vrn_O7fPHj9vv8apE7WZgxbywrW-ly2cjUHxcasGi1hbZk1Wi2mlBrdloraBuDjSItHVBDzjYFSiyPxfmUuwn-actxrNdddNz3NLDfxtqi1KqqKpPk2buyMIlVCv4DllbL1PQ_oa6MtK_w9A1c-W0Y0r_UxkhToNIvz15MyAUfY-C23oRuTWFXI9QvI60LqKeRJvt1H0gxjaoNNLgu_r0gwRosy-S-TK5j5j_H-5Bna4emkg</recordid><startdate>20010701</startdate><enddate>20010701</enddate><creator>Akundi, M.A.</creator><creator>Zhang, J.</creator><creator>Gibbs, M.</creator><creator>Watson, M.M.</creator><creator>Murty, A.N.</creator><creator>Naidu, S.V.</creator><creator>Bruster, E.</creator><creator>Turner, L.</creator><creator>Waller, F.J.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>RIA</scope><scope>RIE</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><scope>F28</scope><scope>FR3</scope></search><sort><creationdate>20010701</creationdate><title>Magneto-chemical character studies of iron-moly and iron-cobalt-moly catalysts</title><author>Akundi, M.A. ; Zhang, J. ; Gibbs, M. ; Watson, M.M. ; Murty, A.N. ; Naidu, S.V. ; Bruster, E. ; Turner, L. ; Waller, F.J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c428t-b9e59763db4006e26012f690f3e5b6e96a166ec6650fb81b5a64c0abac9b21413</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>Catalysis</topic><topic>Catalysts</topic><topic>Catalysts: preparations and properties</topic><topic>Chemistry</topic><topic>Cobalt</topic><topic>Exact sciences and technology</topic><topic>Fuels</topic><topic>General and physical chemistry</topic><topic>Iron</topic><topic>Lead</topic><topic>Magnetic properties</topic><topic>Magnetic resonance</topic><topic>Magnetism</topic><topic>Magnetization</topic><topic>Mossbauer effect</topic><topic>NMR</topic><topic>Nuclear magnetic resonance</topic><topic>Paramagnetic materials</topic><topic>Precursors</topic><topic>Spectra</topic><topic>Spectroscopy</topic><topic>Spectrum analysis</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><toplevel>online_resources</toplevel><creatorcontrib>Akundi, M.A.</creatorcontrib><creatorcontrib>Zhang, J.</creatorcontrib><creatorcontrib>Gibbs, M.</creatorcontrib><creatorcontrib>Watson, M.M.</creatorcontrib><creatorcontrib>Murty, A.N.</creatorcontrib><creatorcontrib>Naidu, S.V.</creatorcontrib><creatorcontrib>Bruster, E.</creatorcontrib><creatorcontrib>Turner, L.</creatorcontrib><creatorcontrib>Waller, F.J.</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><jtitle>IEEE transactions on magnetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Akundi, M.A.</au><au>Zhang, J.</au><au>Gibbs, M.</au><au>Watson, M.M.</au><au>Murty, A.N.</au><au>Naidu, S.V.</au><au>Bruster, E.</au><au>Turner, L.</au><au>Waller, F.J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magneto-chemical character studies of iron-moly and iron-cobalt-moly catalysts</atitle><jtitle>IEEE transactions on magnetics</jtitle><stitle>TMAG</stitle><date>2001-07-01</date><risdate>2001</risdate><volume>37</volume><issue>4</issue><spage>2929</spage><epage>2931</epage><pages>2929-2931</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>Iron, cobalt and molybdenum compounds are extensively used for the conversion of coal to liquid fuels. To examine the correlations between catalytic, magnetic, and spectroscopic properties, we investigated the Zero-field Nuclear Magnetic Resonance spectra of cobalt. Mossbauer spectra of iron, FTIR spectra and magnetic character of the composite for a series of Fe/MoO/sub 3/ and Fe/Co/MoO/sub 3/ catalysts with different inter-metallic ratios and metal loadings. All the precursors are paramagnetic according to the magnetization data. Mossbauer results show that in the precursors Fe is in Fe/sup 3+/ state. FTIR spectra reveal bands due to monodentate and bidentate structures of Fe-MoO/sub 3/ and Co-MoO/sub 3/. NMR spectra support these findings indicating strong inter-metallic interaction between Co and MoO/sub 3/. FTIR results show that exposure to CO or syngas (CO+H/sub 2/), leads to dissociation of metal-MoO/sub 3/ structures and Mossbauer data shows the presence of excess lattice charge with iron in the Fe/sup 2+/ state. Only a minute portion of the composite gets reduced to metallic state. Cobalt seems to form cobalt carbonyl structures, while carbide formations seem to occur with iron. Lack of free metal sites seems to be the reason for the poor conversion of CO observed in the catalytic runs.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/20.951350</doi><tpages>3</tpages></addata></record> |
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| subjects | Catalysis Catalysts Catalysts: preparations and properties Chemistry Cobalt Exact sciences and technology Fuels General and physical chemistry Iron Lead Magnetic properties Magnetic resonance Magnetism Magnetization Mossbauer effect NMR Nuclear magnetic resonance Paramagnetic materials Precursors Spectra Spectroscopy Spectrum analysis Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| title | Magneto-chemical character studies of iron-moly and iron-cobalt-moly catalysts |
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