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dc.contributor.author
Rodrigues, E.L.
dc.contributor.author
Marchi, Alberto Julio
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Apesteguia, Carlos Rodolfo
dc.contributor.author
Bueno, J.M.C.
dc.date.available
2019-04-02T19:49:50Z
dc.date.issued
2005-10
dc.identifier.citation
Rodrigues, E.L.; Marchi, Alberto Julio; Apesteguia, Carlos Rodolfo; Bueno, J.M.C.; Promoting effect of zinc on the vapor-phase hydrogenation of crotonaldehyde over copper-based catalysts; Elsevier Science; Applied Catalysis A: General; 294; 2; 10-2005; 197-207
dc.identifier.issn
0926-860X
dc.identifier.uri
http://hdl.handle.net/11336/73022
dc.description.abstract
The promoting effect of zinc for the vapor-phase hydrogenation of crotonaldehyde was studied on impregnated Cu/SiO2 and Cu-ZnO/SiO 2, and on coprecipitated Cu-Al2O3 and Cu x-ZnyO2y-ZnAl2O4 catalysts. The reaction was carried out in a tubular reactor at 120°C and atmospheric pressure. Samples were characterized by temperature-programmed reduction, X-ray diffraction, transmission electronic microscopy, diffuse reflectance FTIR spectroscopy of adsorbed CO, and X-ray photoelectron spectroscopy. Cu/SiO2 and Cu-Al2O3 catalysts reduced in hydrogen either at 300 or 500°C hydrogenated preferentially the CC bond of crotonaldehyde and gave more than 90% of selectivity to butyraldehyde. In contrast, the initial butyraldehyde selectivity on Cu-ZnO/SiO2 reduced at 500°C was only about 55%, essentially because the selectivity to crotyl alcohol significantly increased on this zinc-containing sample as compared to Cu/SiO2. This selectivity enhancement for hydrogenating the CO bond on Cu-ZnO/SiO2 reduced at 500°C was explained by considering that the high-temperature hydrogen treatment forms mobile ZnOx reduced species that strongly interact with Cu0 crystallites. The resulting Cu0-ZnOx species preferentially catalyze the crotyl alcohol formation from crotonaldehyde via a dual-site reaction pathway. A similar explanation was proposed to interpret the observed enhancement of the CO hydrogenation rate on ternary Cu-Zn-Al catalysts reduced at 500°C as compared to Cu-Al2O 3. Nevertheless, the Cu0-ZnOx species were unstable on stream and the selectivity to crotyl alcohol continuously decreased with reaction time on zinc-containing samples reduced at high temperatures.
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
Copper-Based Catalysts
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Crotonaldehyde Hydrogenation
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Selective Hydrogenation
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Zn-Promoted Catalysts
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Otras Ingeniería Química
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Ingeniería Química
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INGENIERÍAS Y TECNOLOGÍAS
dc.title
Promoting effect of zinc on the vapor-phase hydrogenation of crotonaldehyde over copper-based catalysts
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-04-01T16:12:08Z
dc.journal.volume
294
dc.journal.number
2
dc.journal.pagination
197-207
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Rodrigues, E.L.. Universidade Federal do São Carlos; Brasil
dc.description.fil
Fil: Marchi, Alberto Julio. 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: Apesteguia, Carlos Rodolfo. 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: Bueno, J.M.C.. Universidade Federal do São Carlos; Brasil
dc.journal.title
Applied Catalysis A: General
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.apcata.2005.07.029
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