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dc.contributor.author
Gambaro, Luis Alberto
dc.contributor.author
Briand, Laura Estefania
dc.date.available
2018-08-28T18:27:23Z
dc.date.issued
2004-06
dc.identifier.citation
Gambaro, Luis Alberto; Briand, Laura Estefania; In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol; Elsevier Science; Applied Catalysis A: General; 264; 2; 6-2004; 131-139
dc.identifier.issn
0926-860X
dc.identifier.uri
http://hdl.handle.net/11336/57378
dc.description.abstract
Isopropanol chemisorption and temperature programmed surface reaction analyses were used to determine the nature, amount and acid strength of the active sites of bulk WO3, monolayer supported tungsten oxide over titania and phospho-tungstic Wells-Dawson and Keggin type heteropoly-acids. The temperature conditions were adjusted to cover the surface of the catalysts with a stable monolayer of intermediate chemisorbed isopropoxy species avoiding the adsorption of molecular isopropanol (non reactive) or surface reaction during the chemisorption process. The chemisorption of isopropanol at 40°C led to the coverage of the catalysts with a monolayer of adsorbed isopropoxy species and avoided surface reaction. Heteropoly-compounds were highly active towards isopropanol dehydration above that temperature. The number of available sites for isopropanol adsorption-reaction of Keggin and Wells-Dawson heteropoly-acids was considerably higher than bulk WO3 and monolayer supported tungsten oxide species. The temperature of surface decomposition of adsorbed isopropoxy species towards propylene was considerably lower on the heteropoly-acids rather than the other tungsten oxide based catalysts. The degree of hydration of the heteropoly-anions greatly modified the amount of accessible sites for isopropanol adsorption and further dehydration.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Adsorption
dc.subject
Heteropoly-Acids
dc.subject
Keggin
dc.subject
Number of Active Sites
dc.subject
Temperature Programmed Surface Reaction
dc.subject
Wells-Dawson
dc.subject.classification
Otras Ciencias Químicas
dc.subject.classification
Ciencias Químicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
In situ quantification of the active acid sites of H6P2W18O62·nH 2O heteropoly-acid through chemisorption and temperature programmed surface reaction of isopropanol
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-08-21T13:44:34Z
dc.journal.volume
264
dc.journal.number
2
dc.journal.pagination
131-139
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Gambaro, Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
dc.description.fil
Fil: Briand, Laura Estefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
dc.journal.title
Applied Catalysis A: General
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.apcata.2003.12.053
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0400033X


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