Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes

The catalytic activity of two halometallate complexes based on imidazolium cations, (dimim)[FeCl4] (1) and (dimim)2[Fe2Cl6(μ-O)] (2), was evaluated in the glycolysis of polyethylene terephthalate (PET), either under conventional heating or microwave-assisted conditions. The two procedures led to the...

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Autores: Sce, Fabio, Cano, Israel, Martín, Carmen, Beobide Pacheco, Garikoitz, Castillo, Óscar, Pedro del Valle, Imanol de|||0000-0002-5581-2220
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/18452
Acceso en línea:http://hdl.handle.net/10902/18452
Access Level:acceso abierto
Palabra clave:Imidazolium-based halometallate complex
Iron-containing ionic liquid
Poly(ethylene terephthalate)
Bis(2-hydroxyethyl)terephthalate
Glycolysis
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spelling Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexesSce, FabioCano, IsraelMartín, CarmenBeobide Pacheco, GarikoitzCastillo, ÓscarPedro del Valle, Imanol de|||0000-0002-5581-2220Imidazolium-based halometallate complexIron-containing ionic liquidPoly(ethylene terephthalate)Bis(2-hydroxyethyl)terephthalateGlycolysisThe catalytic activity of two halometallate complexes based on imidazolium cations, (dimim)[FeCl4] (1) and (dimim)2[Fe2Cl6(μ-O)] (2), was evaluated in the glycolysis of polyethylene terephthalate (PET), either under conventional heating or microwave-assisted conditions. The two procedures led to the formation of bis(2-hydroxyethyl)terephthalate (BHET) as the major product with high yields, also allowing the isolation and structural characterization of a new polymorph. The influence of the halometallate structure on the catalytic activity was investigated, and additional experimental studies proved the involvement of both the imidazolium cation and metal anion in the reaction mechanism. The comparison of both approaches showed the advantages of the microwave methodology in terms of efficiency and time saving. Indeed, the use of ground PET and microwave heating provided quantitative yields of BHET. Under conventional heating conditions, the dinuclear iron complex gave a slightly lower yield than (dimim)[FeCl4] (74% vs. 77% for post-consumer PET) after 24 h of reaction. However, the microwave-assisted process led to comparable results in remarkably shorter reaction times (2 h). Interestingly, complex 2, containing the dipolar [Fe2Cl6(μ-O)]2− moiety, provided higher yields than 1 with the non-dipolar [FeCl4]− anion (77% vs. 69%). This behaviour has been rationalized on the basis of dielectric heating mechanisms (polarization and conduction), and it suggests a new approach towards obtaining more efficient catalysts by tailoring the catalytic species to be active in both heating mechanisms.Financial support from the Spanish Ministerio de Ciencia e Innovación (Projects MAT2014-55049-C2-R and MAT2016-75883-C2-1-P), Universidad del País Vasco/EuskalHerrikoUnibertsitatea (GIU17/50 and PPG17/37). Universidad de Cantabria (Proyecto Puente convocatoria 2018 financed by SODERCAN-FEDER).Royal Society of ChemistryUniversidad de Cantabria20192019-06-22journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/18452New J. Chem., 2019,43, 3476-3485reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/184522026-06-02T12:39:31Z
dc.title.none.fl_str_mv Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
title Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
spellingShingle Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
Sce, Fabio
Imidazolium-based halometallate complex
Iron-containing ionic liquid
Poly(ethylene terephthalate)
Bis(2-hydroxyethyl)terephthalate
Glycolysis
title_short Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
title_full Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
title_fullStr Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
title_full_unstemmed Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
title_sort Comparing conventional and microwave-assisted heating in PET degradation mediated by imidazolium-based halometallate complexes
dc.creator.none.fl_str_mv Sce, Fabio
Cano, Israel
Martín, Carmen
Beobide Pacheco, Garikoitz
Castillo, Óscar
Pedro del Valle, Imanol de|||0000-0002-5581-2220
author Sce, Fabio
author_facet Sce, Fabio
Cano, Israel
Martín, Carmen
Beobide Pacheco, Garikoitz
Castillo, Óscar
Pedro del Valle, Imanol de|||0000-0002-5581-2220
author_role author
author2 Cano, Israel
Martín, Carmen
Beobide Pacheco, Garikoitz
Castillo, Óscar
Pedro del Valle, Imanol de|||0000-0002-5581-2220
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Imidazolium-based halometallate complex
Iron-containing ionic liquid
Poly(ethylene terephthalate)
Bis(2-hydroxyethyl)terephthalate
Glycolysis
topic Imidazolium-based halometallate complex
Iron-containing ionic liquid
Poly(ethylene terephthalate)
Bis(2-hydroxyethyl)terephthalate
Glycolysis
description The catalytic activity of two halometallate complexes based on imidazolium cations, (dimim)[FeCl4] (1) and (dimim)2[Fe2Cl6(μ-O)] (2), was evaluated in the glycolysis of polyethylene terephthalate (PET), either under conventional heating or microwave-assisted conditions. The two procedures led to the formation of bis(2-hydroxyethyl)terephthalate (BHET) as the major product with high yields, also allowing the isolation and structural characterization of a new polymorph. The influence of the halometallate structure on the catalytic activity was investigated, and additional experimental studies proved the involvement of both the imidazolium cation and metal anion in the reaction mechanism. The comparison of both approaches showed the advantages of the microwave methodology in terms of efficiency and time saving. Indeed, the use of ground PET and microwave heating provided quantitative yields of BHET. Under conventional heating conditions, the dinuclear iron complex gave a slightly lower yield than (dimim)[FeCl4] (74% vs. 77% for post-consumer PET) after 24 h of reaction. However, the microwave-assisted process led to comparable results in remarkably shorter reaction times (2 h). Interestingly, complex 2, containing the dipolar [Fe2Cl6(μ-O)]2− moiety, provided higher yields than 1 with the non-dipolar [FeCl4]− anion (77% vs. 69%). This behaviour has been rationalized on the basis of dielectric heating mechanisms (polarization and conduction), and it suggests a new approach towards obtaining more efficient catalysts by tailoring the catalytic species to be active in both heating mechanisms.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-06-22
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/18452
url http://hdl.handle.net/10902/18452
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
dc.source.none.fl_str_mv New J. Chem., 2019,43, 3476-3485
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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