Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide

The surface of sulfonic acid functionalized silica has been modified by silylation, using two silylating agents: (CH3)3SiCl and CF3(CF2)5(CH2)2Si(CH3)2Cl. The modified supports were characterized by different techniques. For these systems, BET specific area was found to decrease upon silylation, but...

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Detalles Bibliográficos
Autores: Blanco Brieva, Gema, Campos Martín, José Miguel, Frutos Escrig, Pilar de, García Fierro, José Luis
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/26336
Acceso en línea:http://hdl.handle.net/10261/26336
Access Level:acceso abierto
Palabra clave:H2O2
catalyst
direct synthesis
Palladium
hydrophobic surface
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spelling Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxideBlanco Brieva, GemaCampos Martín, José MiguelFrutos Escrig, Pilar deGarcía Fierro, José LuisH2O2catalystdirect synthesisPalladiumhydrophobic surfaceThe surface of sulfonic acid functionalized silica has been modified by silylation, using two silylating agents: (CH3)3SiCl and CF3(CF2)5(CH2)2Si(CH3)2Cl. The modified supports were characterized by different techniques. For these systems, BET specific area was found to decrease upon silylation, but the effect on other textural properties depends on the silylating agent used. Once modified the supports were taken to prepare catalysts by ionic exchange with a palladium salt. The palladium species ratio depends on the used support. Catalyst system of supported palladium nanoparticles deposited on HSO3-functionalized commercial silica produces hydrogen peroxide with a high yield by feeding a non-flammable H2/O2 mixture into a non-acidic catalyst-methanol suspension at 313 K. However, catalysts prepared with silylated supports show a low yield to hydrogen peroxide, due to low H2O2 selectivity. The drop in the selectivity to hydrogen peroxide is related with the different proportion of palladium species present in silylated catalysts as compared to non silyled sample.The authors acknowledge financial support from Repsol-YPF (Spain) and the Spanish Ministry of Science and Education in the projects PSE-310200-2006-2 and FIT-320100-2006-88. GBB gratefully acknowledge fellowships granted by Repsol-YPF.Peer reviewed201020102010info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501320304 bytesapplication/pdfhttp://hdl.handle.net/10261/26336reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCatalysis Todayhttp://dx.doi.org/10.1016/j.cattod.2010.04.028info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/263362026-05-22T06:33:51Z
dc.title.none.fl_str_mv Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
title Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
spellingShingle Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
Blanco Brieva, Gema
H2O2
catalyst
direct synthesis
Palladium
hydrophobic surface
title_short Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
title_full Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
title_fullStr Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
title_full_unstemmed Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
title_sort Some insights on the negative effect played by silylation of functionalized commercial silica in the direct synthesis of hydrogen peroxide
dc.creator.none.fl_str_mv Blanco Brieva, Gema
Campos Martín, José Miguel
Frutos Escrig, Pilar de
García Fierro, José Luis
author Blanco Brieva, Gema
author_facet Blanco Brieva, Gema
Campos Martín, José Miguel
Frutos Escrig, Pilar de
García Fierro, José Luis
author_role author
author2 Campos Martín, José Miguel
Frutos Escrig, Pilar de
García Fierro, José Luis
author2_role author
author
author
dc.subject.none.fl_str_mv H2O2
catalyst
direct synthesis
Palladium
hydrophobic surface
topic H2O2
catalyst
direct synthesis
Palladium
hydrophobic surface
description The surface of sulfonic acid functionalized silica has been modified by silylation, using two silylating agents: (CH3)3SiCl and CF3(CF2)5(CH2)2Si(CH3)2Cl. The modified supports were characterized by different techniques. For these systems, BET specific area was found to decrease upon silylation, but the effect on other textural properties depends on the silylating agent used. Once modified the supports were taken to prepare catalysts by ionic exchange with a palladium salt. The palladium species ratio depends on the used support. Catalyst system of supported palladium nanoparticles deposited on HSO3-functionalized commercial silica produces hydrogen peroxide with a high yield by feeding a non-flammable H2/O2 mixture into a non-acidic catalyst-methanol suspension at 313 K. However, catalysts prepared with silylated supports show a low yield to hydrogen peroxide, due to low H2O2 selectivity. The drop in the selectivity to hydrogen peroxide is related with the different proportion of palladium species present in silylated catalysts as compared to non silyled sample.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010
2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/26336
url http://hdl.handle.net/10261/26336
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Catalysis Today
http://dx.doi.org/10.1016/j.cattod.2010.04.028
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 320304 bytes
application/pdf
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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