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dc.contributor.author
Gorsd, Marina Noelia
dc.contributor.author
Sathicq, Angel Gabriel
dc.contributor.author
Romanelli, Gustavo Pablo
dc.contributor.author
Pizzio, Luis Rene
dc.contributor.author
Blanco, Mirta Noemi
dc.date.available
2018-03-26T20:34:19Z
dc.date.issued
2016-08
dc.identifier.citation
Gorsd, Marina Noelia; Sathicq, Angel Gabriel; Romanelli, Gustavo Pablo; Pizzio, Luis Rene; Blanco, Mirta Noemi; Tungstophosphoric acid supported on core-shell polystyrene-silica microspheres or hollow silica spheres catalyzed trisubstituted imidazole synthesis by multicomponent reaction; Elsevier Science; Journal of Molecular Catalysis A: Chemical; 420; 8-2016; 294-302
dc.identifier.issn
1381-1169
dc.identifier.uri
http://hdl.handle.net/11336/40039
dc.description.abstract
Materials based on tungstophosphoric acid supported on core-shell polystyrene-silica microspheres or hollow silica spheres were prepared, characterized and used as catalysts in the synthesis of trisubstituted imidazoles by a multicomponent reaction under solvent-free conditions. For the preparation of the two different silica-based structures, silica was synthesized using tetraethylorthosilicate (TEOS) as precursor in an ethanol-ammonium solution and polystyrene spheres as template or core. The formation and growth of the silica layer to obtain the core-shell microspheres were followed by 24 h. Then, the hollow spheres were obtained by calcination of the core-shell material at 500 °C for 3 h. Both supports were impregnated with tungstophosphoric acid (TPA) solutions. A smooth appearance of the spheres was observed by scanning electron microscopy (SEM). Mesoporous materials were obtained, without important microporosity, as determined from N2 adsorption-desorption isotherms. The Fourier transform infrared (FT-IR) spectra confirmed that complete removal of the polystyrene core can directly be achieved by calcination at 500 °C, and also that Keggin undegraded TPA species are present in the impregnated solids. The acidic characteristics of the solids were evaluated by potentiometric titration, showing that they exhibit very strong acid sites. Moreover, peaks assigned to crystalline forms of TPA were observed by XRD. The yields obtained in the solvent-free synthesis of 2,4,5-triphenyl-1H-imidazole and other eight trisubstituted imidazoles were high, without formation of by-products resulting from competitive reactions or decomposition products, so the prepared materials are highly selective catalysts.
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
Hollow Silica Spheres
dc.subject
Polystyrene-Silica Spheres
dc.subject
Trisubstituted Imidazoles
dc.subject
Tungstophosphoric Acid
dc.title
Tungstophosphoric acid supported on core-shell polystyrene-silica microspheres or hollow silica spheres catalyzed trisubstituted imidazole synthesis by multicomponent reaction
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-03-26T18:06:09Z
dc.journal.volume
420
dc.journal.pagination
294-302
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Gorsd, Marina Noelia. 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: Sathicq, Angel Gabriel. 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: Romanelli, Gustavo Pablo. 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: Pizzio, Luis Rene. 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: Blanco, Mirta Noemi. 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
Journal of Molecular Catalysis A: Chemical
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.molcata.2016.04.010
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1381116916301327
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