Synthesis, acid properties and catalysis by niobium oxide nanostructured materials

Several forms of niobium oxide were prepared, including nanostructured mesoporous materials, and their acidity properties were comprehensively investigated and compared with commercially available materials. The composites were characterized by a variety of techniques, including XRD, TEM, N-2 adsorp...

Descripción completa

Detalles Bibliográficos
Autores: Marín García, Mª Luisa|||0000-0002-9789-8894, Hallett-Tapley, Geniece L., Impellizzeri, Stefania, Fasciani, Chiara, Simoncelli, Sabrina, Netto-Ferreira, Jose Carlos, Scaiano, Juan C.
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/61430
Acceso en línea:https://riunet.upv.es/handle/10251/61430
Access Level:acceso abierto
Palabra clave:5-HYDROXYMETHYL-2-FURALDEHYDE
DEHYDRATION
PHOSPHATE
SILICA
QUIMICA ORGANICA
QUIMICA ANALITICA
id ES_8d23e83a17a9c3637d627cf4e16844bb
oai_identifier_str oai:riunet.upv.es:10251/61430
network_acronym_str ES
network_name_str España
repository_id_str
spelling Synthesis, acid properties and catalysis by niobium oxide nanostructured materialsMarín García, Mª Luisa|||0000-0002-9789-8894Hallett-Tapley, Geniece L.Impellizzeri, StefaniaFasciani, ChiaraSimoncelli, SabrinaNetto-Ferreira, Jose CarlosScaiano, Juan C.5-HYDROXYMETHYL-2-FURALDEHYDEDEHYDRATIONPHOSPHATESILICAQUIMICA ORGANICAQUIMICA ANALITICASeveral forms of niobium oxide were prepared, including nanostructured mesoporous materials, and their acidity properties were comprehensively investigated and compared with commercially available materials. The composites were characterized by a variety of techniques, including XRD, TEM, N-2 adsorption and Hammett acid indicator studies. The acidity of the niobium oxide derivatives was also investigated by the ability of the materials to successfully promote the halochromic ring-opening of an oxazine-coumarin probe that was specifically designed for use in fluorescence imaging studies. The ring-opening reaction was easily monitored using UV-visible, fluorescence and NMR spectroscopy. Single molecule microscopy was employed to gain a more in-depth understanding of the niobium oxide acid catalysis pathway. Using this technique, the rate of niobium oxide mediated protonation was estimated to be 1.8 x 10(-13) mol m(-2) s(-1). Single molecule analysis was also used to obtain a detailed map of Bronsted acid sites on the niobium oxide surface. The active sites, located by multiple blinking events, do not seem to be localized on any area of the material, but rather randomly distributed throughout the solid state surface. As the reaction proceeds, the sites with the highest acidity and accessibility are gradually consumed, making the next tier of acid sites available for reaction. The phenomenon was more closely characterized by using time lapsed reactivity maps.The authors wish to thank the Natural Sciences and Engineering Research Council (NSERC) and the Canada Research Chairs program. The University of Ottawa International Office provided grants to study niobium. M. L. Marin thanks the financial support of the Generalitat Valenciana (BEST/2012/233). Thanks are due to the Government of Canada and NSERC for a Banting Postdoctoral Fellowship to S. Impellizzeri and a Vanier Sholarship to C. Fasciani. S. Simoncelli acknowledges a DFAIT fellowship from ELAP (Emerging Leaders in the Americas Program) to support her visit to Canada.Royal Society of ChemistryInstituto Universitario Mixto de Tecnología QuímicaDepartamento de QuímicaEscuela Técnica Superior de Ingeniería IndustrialGovernment of CanadaGeneralitat ValencianaUniversity of OttawaNatural Sciences and Engineering Research Council of CanadaForeign Affairs and International Trade CanadaRepositorio Institucional de la Universitat Politècnica de València Riunet20142014-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://riunet.upv.es/handle/10251/61430reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valénciainstname:Universitat Politècnica de València (UPV)InglésengGeneralitat Valenciana https://doi.org/10.13039/501100003359 BEST%2F2012%2F233open accesshttp://purl.org/coar/access_right/c_abf2Reserva de todos los derechoshttp://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:riunet.upv.es:10251/614302026-06-13T07:49:27Z
dc.title.none.fl_str_mv Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
title Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
spellingShingle Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
Marín García, Mª Luisa|||0000-0002-9789-8894
5-HYDROXYMETHYL-2-FURALDEHYDE
DEHYDRATION
PHOSPHATE
SILICA
QUIMICA ORGANICA
QUIMICA ANALITICA
title_short Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
title_full Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
title_fullStr Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
title_full_unstemmed Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
title_sort Synthesis, acid properties and catalysis by niobium oxide nanostructured materials
dc.creator.none.fl_str_mv Marín García, Mª Luisa|||0000-0002-9789-8894
Hallett-Tapley, Geniece L.
Impellizzeri, Stefania
Fasciani, Chiara
Simoncelli, Sabrina
Netto-Ferreira, Jose Carlos
Scaiano, Juan C.
author Marín García, Mª Luisa|||0000-0002-9789-8894
author_facet Marín García, Mª Luisa|||0000-0002-9789-8894
Hallett-Tapley, Geniece L.
Impellizzeri, Stefania
Fasciani, Chiara
Simoncelli, Sabrina
Netto-Ferreira, Jose Carlos
Scaiano, Juan C.
author_role author
author2 Hallett-Tapley, Geniece L.
Impellizzeri, Stefania
Fasciani, Chiara
Simoncelli, Sabrina
Netto-Ferreira, Jose Carlos
Scaiano, Juan C.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Instituto Universitario Mixto de Tecnología Química
Departamento de Química
Escuela Técnica Superior de Ingeniería Industrial
Government of Canada
Generalitat Valenciana
University of Ottawa
Natural Sciences and Engineering Research Council of Canada
Foreign Affairs and International Trade Canada
Repositorio Institucional de la Universitat Politècnica de València Riunet
dc.subject.none.fl_str_mv 5-HYDROXYMETHYL-2-FURALDEHYDE
DEHYDRATION
PHOSPHATE
SILICA
QUIMICA ORGANICA
QUIMICA ANALITICA
topic 5-HYDROXYMETHYL-2-FURALDEHYDE
DEHYDRATION
PHOSPHATE
SILICA
QUIMICA ORGANICA
QUIMICA ANALITICA
description Several forms of niobium oxide were prepared, including nanostructured mesoporous materials, and their acidity properties were comprehensively investigated and compared with commercially available materials. The composites were characterized by a variety of techniques, including XRD, TEM, N-2 adsorption and Hammett acid indicator studies. The acidity of the niobium oxide derivatives was also investigated by the ability of the materials to successfully promote the halochromic ring-opening of an oxazine-coumarin probe that was specifically designed for use in fluorescence imaging studies. The ring-opening reaction was easily monitored using UV-visible, fluorescence and NMR spectroscopy. Single molecule microscopy was employed to gain a more in-depth understanding of the niobium oxide acid catalysis pathway. Using this technique, the rate of niobium oxide mediated protonation was estimated to be 1.8 x 10(-13) mol m(-2) s(-1). Single molecule analysis was also used to obtain a detailed map of Bronsted acid sites on the niobium oxide surface. The active sites, located by multiple blinking events, do not seem to be localized on any area of the material, but rather randomly distributed throughout the solid state surface. As the reaction proceeds, the sites with the highest acidity and accessibility are gradually consumed, making the next tier of acid sites available for reaction. The phenomenon was more closely characterized by using time lapsed reactivity maps.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://riunet.upv.es/handle/10251/61430
url https://riunet.upv.es/handle/10251/61430
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Generalitat Valenciana https://doi.org/10.13039/501100003359 BEST%2F2012%2F233
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reserva de todos los derechos
http://rightsstatements.org/vocab/InC/1.0/
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
Reserva de todos los derechos
http://rightsstatements.org/vocab/InC/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
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 reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname:Universitat Politècnica de València (UPV)
instname_str Universitat Politècnica de València (UPV)
reponame_str RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
collection RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869413020334030848
score 15,300719

Similares en LA Referencia