Indium as a chemical promoter in Fe-based Fischer-Tropsch synthesis
Identifieur interne : 003F14 ( Main/Repository ); précédent : 003F13; suivant : 003F15Indium as a chemical promoter in Fe-based Fischer-Tropsch synthesis
Auteurs : RBID : Pascal:10-0222677Descripteurs français
- Pascal (Inist)
- Indium, Promoteur, Synthèse Fischer Tropsch, Catalyseur, Cuivre, Catalyse hétérogène, Physisorption, Réduction chimique, Diffraction RX, Facteur réflexion, Spectrométrie IR, In situ, Réacteur, Réductibilité, Adsorption, Point fusion, Carburation chimique, Sélectivité, Hydrocarbure, Aire superficielle, Spectrométrie DRIFT.
- Wicri :
- concept : Cuivre, Hydrocarbure.
English descriptors
- KwdEn :
Abstract
The ability of indium to act as a chemical promoter in Fe-based FTS reaction was evaluated and compared to that of copper. Indium was chosen for study due its relationship to Cu through the 'Knight's Move' relationship. N2 physisorption, temperature programmed reduction (TPR), X-ray diffraction (XRD) and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) were employed to characterise the catalysts. "In situ" Fischer-Tropsch synthesis (FTS) reactions were also performed in a DRIFTS reactor. It was found via TPR studies that indium exhibited a similar ability to reduce Fe as found for copper. Results obtained from XRD and N2 physisorption experiments showed indium promoted catalysts give comparable results to those of copper promoted catalysts. However, indium decreased the % reducibility and CO adsorption ability of the Fe catalyst. Indium also lowered the FTS activity of the Fe-based catalyst, an effect ascribed to be associated with the low melting point of In. The effect of adding indium to a multi-promoted Fe-based FTS catalyst was also investigated. The addition of indium suppressed the reduction properties of the catalyst when H2 was employed as a reductant. When CO was employed as a reductant, the reduction/carburization properties were improved and resulted in a selectivity shift to heavy weight hydrocarbons during the FTS reaction. Adding indium to the multi-promoted catalyst also lowered the catalyst surface area which resulted in a decrease to the FTS activity. It appears that while the'Knight's Move' relationship is consistent with Cu and In both acting to enhance Fe reduction, the low In melting point determines the poor activity of the FT catalysts.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Indium as a chemical promoter in Fe-based Fischer-Tropsch synthesis</title><author><name sortKey="Hexana, Wonga M" uniqKey="Hexana W">Wonga M. Hexana</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand</s1><s2>Johannesburg, 2050</s2><s3>ZAF</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Afrique du Sud</country><placeName><settlement type="city">Johannesburg</settlement><region type="region" nuts="2">Gauteng</region></placeName><orgName type="university">Université du Witwatersrand</orgName></affiliation></author><author><name sortKey="Coville, Neil J" uniqKey="Coville N">Neil J. Coville</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand</s1><s2>Johannesburg, 2050</s2><s3>ZAF</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Afrique du Sud</country><placeName><settlement type="city">Johannesburg</settlement><region type="region" nuts="2">Gauteng</region></placeName><orgName type="university">Université du Witwatersrand</orgName></affiliation></author></titleStmt><publicationStmt><idno type="inist">10-0222677</idno><date when="2010">2010</date><idno type="stanalyst">PASCAL 10-0222677 INIST</idno><idno type="RBID">Pascal:10-0222677</idno><idno type="wicri:Area/Main/Corpus">004591</idno><idno type="wicri:Area/Main/Repository">003F14</idno></publicationStmt><seriesStmt><idno type="ISSN">0926-860X</idno><title level="j" type="abbreviated">Appl. catal., A Gen. : (Print)</title><title level="j" type="main">Applied catalysis. A, General : (Print)</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adsorption</term><term>Carburization</term><term>Catalyst</term><term>Chemical reduction</term><term>Copper</term><term>Fischer Tropsch synthesis</term><term>Heterogeneous catalysis</term><term>Hydrocarbon</term><term>In situ</term><term>Indium</term><term>Infrared spectrometry</term><term>Melting point</term><term>Physisorption</term><term>Promoter</term><term>Reactor</term><term>Reducibility</term><term>Reflectance</term><term>Selectivity</term><term>Surface area</term><term>X ray diffraction</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Indium</term><term>Promoteur</term><term>Synthèse Fischer Tropsch</term><term>Catalyseur</term><term>Cuivre</term><term>Catalyse hétérogène</term><term>Physisorption</term><term>Réduction chimique</term><term>Diffraction RX</term><term>Facteur réflexion</term><term>Spectrométrie IR</term><term>In situ</term><term>Réacteur</term><term>Réductibilité</term><term>Adsorption</term><term>Point fusion</term><term>Carburation chimique</term><term>Sélectivité</term><term>Hydrocarbure</term><term>Aire superficielle</term><term>Spectrométrie DRIFT</term></keywords><keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Cuivre</term><term>Hydrocarbure</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The ability of indium to act as a chemical promoter in Fe-based FTS reaction was evaluated and compared to that of copper. Indium was chosen for study due its relationship to Cu through the 'Knight's Move' relationship. N<sub>2</sub> physisorption, temperature programmed reduction (TPR), X-ray diffraction (XRD) and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) were employed to characterise the catalysts. "In situ" Fischer-Tropsch synthesis (FTS) reactions were also performed in a DRIFTS reactor. It was found via TPR studies that indium exhibited a similar ability to reduce Fe as found for copper. Results obtained from XRD and N<sub>2</sub> physisorption experiments showed indium promoted catalysts give comparable results to those of copper promoted catalysts. However, indium decreased the % reducibility and CO adsorption ability of the Fe catalyst. Indium also lowered the FTS activity of the Fe-based catalyst, an effect ascribed to be associated with the low melting point of In. The effect of adding indium to a multi-promoted Fe-based FTS catalyst was also investigated. The addition of indium suppressed the reduction properties of the catalyst when H<sub>2</sub> was employed as a reductant. When CO was employed as a reductant, the reduction/carburization properties were improved and resulted in a selectivity shift to heavy weight hydrocarbons during the FTS reaction. Adding indium to the multi-promoted catalyst also lowered the catalyst surface area which resulted in a decrease to the FTS activity. It appears that while the'Knight's Move' relationship is consistent with Cu and In both acting to enhance Fe reduction, the low In melting point determines the poor activity of the FT catalysts.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0926-860X</s0></fA01><fA03 i2="1"><s0>Appl. catal., A Gen. : (Print)</s0></fA03><fA05><s2>377</s2></fA05><fA06><s2>1-2</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Indium as a chemical promoter in Fe-based Fischer-Tropsch synthesis</s1></fA08><fA11 i1="01" i2="1"><s1>HEXANA (Wonga M.)</s1></fA11><fA11 i1="02" i2="1"><s1>COVILLE (Neil J.)</s1></fA11><fA14 i1="01"><s1>Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand</s1><s2>Johannesburg, 2050</s2><s3>ZAF</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></fA14><fA20><s1>150-157</s1></fA20><fA21><s1>2010</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>18840A</s2><s5>354000181869250210</s5></fA43><fA44><s0>0000</s0><s1>© 2010 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>43 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>10-0222677</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Applied catalysis. A, General : (Print)</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>The ability of indium to act as a chemical promoter in Fe-based FTS reaction was evaluated and compared to that of copper. Indium was chosen for study due its relationship to Cu through the 'Knight's Move' relationship. N<sub>2</sub> physisorption, temperature programmed reduction (TPR), X-ray diffraction (XRD) and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) were employed to characterise the catalysts. "In situ" Fischer-Tropsch synthesis (FTS) reactions were also performed in a DRIFTS reactor. It was found via TPR studies that indium exhibited a similar ability to reduce Fe as found for copper. Results obtained from XRD and N<sub>2</sub> physisorption experiments showed indium promoted catalysts give comparable results to those of copper promoted catalysts. However, indium decreased the % reducibility and CO adsorption ability of the Fe catalyst. Indium also lowered the FTS activity of the Fe-based catalyst, an effect ascribed to be associated with the low melting point of In. The effect of adding indium to a multi-promoted Fe-based FTS catalyst was also investigated. The addition of indium suppressed the reduction properties of the catalyst when H<sub>2</sub> was employed as a reductant. When CO was employed as a reductant, the reduction/carburization properties were improved and resulted in a selectivity shift to heavy weight hydrocarbons during the FTS reaction. Adding indium to the multi-promoted catalyst also lowered the catalyst surface area which resulted in a decrease to the FTS activity. It appears that while the'Knight's Move' relationship is consistent with Cu and In both acting to enhance Fe reduction, the low In melting point determines the poor activity of the FT catalysts.</s0></fC01><fC02 i1="01" i2="X"><s0>001C01A03</s0></fC02><fC02 i1="02" i2="X"><s0>001C01I</s0></fC02><fC03 i1="01" i2="X" l="FRE"><s0>Indium</s0><s2>NC</s2><s5>01</s5></fC03><fC03 i1="01" i2="X" l="ENG"><s0>Indium</s0><s2>NC</s2><s5>01</s5></fC03><fC03 i1="01" i2="X" l="SPA"><s0>Indio</s0><s2>NC</s2><s5>01</s5></fC03><fC03 i1="02" i2="X" l="FRE"><s0>Promoteur</s0><s5>02</s5></fC03><fC03 i1="02" i2="X" l="ENG"><s0>Promoter</s0><s5>02</s5></fC03><fC03 i1="02" i2="X" l="SPA"><s0>Promotor</s0><s5>02</s5></fC03><fC03 i1="03" i2="X" l="FRE"><s0>Synthèse Fischer Tropsch</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="ENG"><s0>Fischer Tropsch synthesis</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="SPA"><s0>Síntesis Fischer Tropsch</s0><s5>03</s5></fC03><fC03 i1="04" i2="X" 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