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dc.contributor.author
Busto, Mariana
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dc.contributor.author
Lovato, Maria Eugenia
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dc.contributor.author
Vera, Carlos Roman
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dc.contributor.author
Shimizu, Kiyoyuki
dc.contributor.author
Grau, Javier Mario
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dc.date.available
2017-09-29T17:37:15Z
dc.date.issued
2009-02
dc.identifier.citation
Busto, Mariana; Lovato, Maria Eugenia; Vera, Carlos Roman; Shimizu, Kiyoyuki; Grau, Javier Mario; Silica supported tungsta-zirconia catalysts for hydroisomerization-cracking of long alkanes; Elsevier Science; Applied Catalysis A: General; 355; 2-2009; 123-131
dc.identifier.issn
0926-860X
dc.identifier.uri
http://hdl.handle.net/11336/25444
dc.description.abstract
New acidic materials with fairly uniform mesoporous texture were synthesized by deposition of tungsten promoted (WZ) over a wide pore silica carrier (SiO2). High dispersion of the tungsten-zirconia crystallites was achieved by a two-step controlled impregnation procedure. A first deposition of zirconia was performed by controlled hydrolysis of alkoxide. Impregnation of tungstate was performed by incipient wetness impregnation of ammonium metatungstate. The catalysts show an activation pattern for the reaction of 1-butene similar to bulk tungsten-zirconia catalyst with an optimum at a calcination temperature of 750 °C. Supported zirconia crystallizes almost exclusively as tetragonal crystallites. The catalysts were tested in the reaction of hydroisomerization cracking of octane (300 °C, 1 atm, WHSV=1 h−1 and H2/nC8= 6 mol/mol) for the production of light isoalkanes (isobutane, isopentane, isohexane) of high octane number. The tried catalysts had a high catalytic activity and this result was related to the high surface area. Both bulk and deactivated rapidly if they did not contain Pt. Impregnation with Pt and the use of H2 in the reaction medium enable the hydrogenation of coke precursors and the stabilization of the catalyst. A stable performance was obtained at a moderate activity level. This was attributed to the presence of Pt/SiO2 particles with a stronger metal function than Pt/WZ due to a lower metal support interaction. The supported catalysts would have a higher hydrogenating activity and this would be crucial for enhancing their stability in comparison to bulk Pt/WZ. Tungsten addition to zirconia in amounts greater than 7.5% produced segregation of a WO3 phase in the form of crystallites that plugged pores and produced a reduction of the available area and hence of the overall catalytic activity. For the WZ supported catalysts activity as a function of calcination temperature had a pattern similar to that of bulk WZ catalysts. Supported WZ catalysts were more stable in the n-octane isomerization reaction and reached a pseudo steady state even at very low H2 partial pressures while bulk WZ catalysts deactivated continuously and stabilized only at high H2 partial pressures. On a mass basis of active WZ phase some supported catalysts had a higher activity than bulk WZ. They also have a more open pore structure more suitable for the reaction of bulky molecules. However the dilution effect of silica produces catalysts with a relatively low activity per unit volume.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Supported Zirconia
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Silica
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Tugsten Zirconia
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Hydroisomerization
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Hydrocracking
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Long Paraffins
dc.subject.classification
Otras Ingeniería Química
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dc.subject.classification
Ingeniería Química
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dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
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dc.title
Silica supported tungsta-zirconia catalysts for hydroisomerization-cracking of long alkanes
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-25T18:24:15Z
dc.journal.volume
355
dc.journal.pagination
123-131
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Busto, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina
dc.description.fil
Fil: Lovato, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.description.fil
Fil: Vera, Carlos Roman. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina
dc.description.fil
Fil: Shimizu, Kiyoyuki. Council for Science and Technology Policy; Japón
dc.description.fil
Fil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina
dc.journal.title
Applied Catalysis A: General
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0926860X08007606
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.apcata.2008.12.009
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