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dc.contributor.author
Vera, Carlos Roman
dc.contributor.author
Pieck, Carlos Luis
dc.contributor.author
Shimizu, Kiyoyuki
dc.contributor.author
Parera, Jose
dc.date.available
2018-03-27T19:46:51Z
dc.date.issued
2002-12
dc.identifier.citation
Vera, Carlos Roman; Pieck, Carlos Luis; Shimizu, Kiyoyuki; Parera, Jose; Tetragonal structure, anionic vacancies and catalytic activity of SO42−-ZrO2 catalysts for n-butane isomerization; Elsevier Science; Applied Catalysis A: General; 230; 1-2; 12-2002; 137-151
dc.identifier.issn
0926-860X
dc.identifier.uri
http://hdl.handle.net/11336/40208
dc.description.abstract
Abstract An assessment of the influence of the crystal structure, surface hydroxylation state and previous oxidation/reduction pretreatments on the activity of sulfate-zirconia catalysts for isomerization of n-butane was performed using crystalline and amorphous zirconia supports. Different sulfation methods were used for the preparation of bulk and supported SO42−-ZrO2 with monoclinic, tetragonal and tetragonal+monoclinic structures. Activity was important only for the samples that contained tetragonal crystals. The catalysts prepared from pure monoclinic zirconia showed negligible activity. SO42−-ZrO2 catalysts prepared by sulfation of crystalline zirconia displayed sites with lower acidity and cracking activity than those sulfated in the amorphous state. Prereduction of the zirconia samples with H2 was found to greatly increase the catalytic activity, and a maximum rate was found at a reduction temperature of 550–600 °C, coinciding with a TPR peak supposedly associated with the removal of lattice oxygen and the creation of lattice defects. A weaker dependence of catalytic activity on the density or type of surface OH groups on zirconia (before sulfation) was found in this work. A model of active site generation was constructed in order to stress the dependence on the crystal structure and crystal defects. Current and previous results suggest that tetragonal structure in active SO42−-ZrO2 is a consequence of the stabilization of anionic vacancies in zirconia. Anionic vacancies are in turn supposed to be related to the catalytic activity for n-butane isomerization through the stabilization of electrons from ionized intermediates.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Sulfate Zirconia
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Crystalline Zirconia
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N-Butane Isomerization
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Tetragonal Structure
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Oxygen Vacancy
dc.subject.classification
Ingeniería Medioambiental y Geológica, Geotécnicas
dc.subject.classification
Ingeniería del Medio Ambiente
dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
dc.title
Tetragonal structure, anionic vacancies and catalytic activity of SO42−-ZrO2 catalysts for n-butane isomerization
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-03-16T15:42:21Z
dc.journal.volume
230
dc.journal.number
1-2
dc.journal.pagination
137-151
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdan
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 ; Argentina
dc.description.fil
Fil: Pieck, Carlos Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
dc.description.fil
Fil: Shimizu, Kiyoyuki. National Institute for Resources and Environment (NIRE) (AIST, MITI); Japón
dc.description.fil
Fil: Parera, Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
dc.journal.title
Applied Catalysis A: General
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/S0926-860X(01)01002-X
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0101002X
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