On the promotion of catalytic reactions by surface acoustic waves

Surface acoustic waves (SAW) allow to manipulate surfaces with potential applications in catalysis, sensor and nanotechnology. SAWs were shown to cause a strong increase in catalytic activity and selectivity in many oxidation and decomposition reactions on metallic and oxidic catalysts. However, the...

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Autores: von Boehn, Bernhard|||0000-0003-3722-5767, Foerster, Michael|||0000-0002-4147-6668, von Boehn, Moritz, Prat Albert, Jordi|||0000-0002-9708-4831, Macià, Ferran|||0000-0001-5972-4810, Casals, Blai|||0000-0002-2941-1861, Khaliq, Muhammad Waqas|||0000-0002-9696-3498, Hernández-Mínguez, Alberto, Aballe, Lucía|||0000-0003-1810-8768, Imbihl, Ronald|||0000-0002-5155-7250
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:238791
Acceso en línea:https://ddd.uab.cat/record/238791
https://dx.doi.org/urn:doi:10.1002/anie.202005883
Access Level:acceso abierto
Palabra clave:Heterogeneous catalysis
LEEM
PEEM
Surface acoustic waves
Work function
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spelling On the promotion of catalytic reactions by surface acoustic wavesvon Boehn, Bernhard|||0000-0003-3722-5767Foerster, Michael|||0000-0002-4147-6668von Boehn, MoritzPrat Albert, Jordi|||0000-0002-9708-4831Macià, Ferran|||0000-0001-5972-4810Casals, Blai|||0000-0002-2941-1861Khaliq, Muhammad Waqas|||0000-0002-9696-3498Hernández-Mínguez, AlbertoAballe, Lucía|||0000-0003-1810-8768Imbihl, Ronald|||0000-0002-5155-7250Heterogeneous catalysisLEEMPEEMSurface acoustic wavesWork functionSurface acoustic waves (SAW) allow to manipulate surfaces with potential applications in catalysis, sensor and nanotechnology. SAWs were shown to cause a strong increase in catalytic activity and selectivity in many oxidation and decomposition reactions on metallic and oxidic catalysts. However, the promotion mechanism has not been unambiguously identified. Using stroboscopic X-ray photoelectron spectro-microscopy, we were able to evidence a sub-nanosecond work function change during propagation of 500 MHz SAWs on a 9 nm thick platinum film. We quantify the work function change to 455 μeV. Such a small variation rules out that electronic effects due to elastic deformation (strain) play a major role in the SAW-induced promotion of catalysis. In a second set of experiments, SAW-induced intermixing of a five monolayers thick Rh film on top of polycrystalline platinum was demonstrated to be due to enhanced thermal diffusion caused by an increase of the surface temperature by about 75 K when SAWs were excited. Reversible surface structural changes are suggested to be a major cause for catalytic promotion. Surface acoustic waves (SAWs) are dynamic lattice distortions, which can be excited on piezoelectric materials. For many years a promotion of the catalytic activity and selectivity by SAWs has been known, but no mechanistic understanding has been established yet. We quantify the effect that SAWs have on the electronic and geometric structure of a model catalyst, providing a basis for discussing the promotion mechanism of SAWs in catalytic surface reactions. 22020-01-0120202020-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/238791https://dx.doi.org/urn:doi:10.1002/anie.202005883reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 730872Agencia Estatal de Investigación https://doi.org/10.13039/501100011033 RTI2018-095303-B-C53Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 RYC-2014-16515Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2015-69144-PMinisterio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2015-0496Agencia Estatal de Investigación https://doi.org/10.13039/501100011033 MAT2017-85232-Ropen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.https://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2387912026-06-06T12:50:31Z
dc.title.none.fl_str_mv On the promotion of catalytic reactions by surface acoustic waves
title On the promotion of catalytic reactions by surface acoustic waves
spellingShingle On the promotion of catalytic reactions by surface acoustic waves
von Boehn, Bernhard|||0000-0003-3722-5767
Heterogeneous catalysis
LEEM
PEEM
Surface acoustic waves
Work function
title_short On the promotion of catalytic reactions by surface acoustic waves
title_full On the promotion of catalytic reactions by surface acoustic waves
title_fullStr On the promotion of catalytic reactions by surface acoustic waves
title_full_unstemmed On the promotion of catalytic reactions by surface acoustic waves
title_sort On the promotion of catalytic reactions by surface acoustic waves
dc.creator.none.fl_str_mv von Boehn, Bernhard|||0000-0003-3722-5767
Foerster, Michael|||0000-0002-4147-6668
von Boehn, Moritz
Prat Albert, Jordi|||0000-0002-9708-4831
Macià, Ferran|||0000-0001-5972-4810
Casals, Blai|||0000-0002-2941-1861
Khaliq, Muhammad Waqas|||0000-0002-9696-3498
Hernández-Mínguez, Alberto
Aballe, Lucía|||0000-0003-1810-8768
Imbihl, Ronald|||0000-0002-5155-7250
author von Boehn, Bernhard|||0000-0003-3722-5767
author_facet von Boehn, Bernhard|||0000-0003-3722-5767
Foerster, Michael|||0000-0002-4147-6668
von Boehn, Moritz
Prat Albert, Jordi|||0000-0002-9708-4831
Macià, Ferran|||0000-0001-5972-4810
Casals, Blai|||0000-0002-2941-1861
Khaliq, Muhammad Waqas|||0000-0002-9696-3498
Hernández-Mínguez, Alberto
Aballe, Lucía|||0000-0003-1810-8768
Imbihl, Ronald|||0000-0002-5155-7250
author_role author
author2 Foerster, Michael|||0000-0002-4147-6668
von Boehn, Moritz
Prat Albert, Jordi|||0000-0002-9708-4831
Macià, Ferran|||0000-0001-5972-4810
Casals, Blai|||0000-0002-2941-1861
Khaliq, Muhammad Waqas|||0000-0002-9696-3498
Hernández-Mínguez, Alberto
Aballe, Lucía|||0000-0003-1810-8768
Imbihl, Ronald|||0000-0002-5155-7250
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Heterogeneous catalysis
LEEM
PEEM
Surface acoustic waves
Work function
topic Heterogeneous catalysis
LEEM
PEEM
Surface acoustic waves
Work function
description Surface acoustic waves (SAW) allow to manipulate surfaces with potential applications in catalysis, sensor and nanotechnology. SAWs were shown to cause a strong increase in catalytic activity and selectivity in many oxidation and decomposition reactions on metallic and oxidic catalysts. However, the promotion mechanism has not been unambiguously identified. Using stroboscopic X-ray photoelectron spectro-microscopy, we were able to evidence a sub-nanosecond work function change during propagation of 500 MHz SAWs on a 9 nm thick platinum film. We quantify the work function change to 455 μeV. Such a small variation rules out that electronic effects due to elastic deformation (strain) play a major role in the SAW-induced promotion of catalysis. In a second set of experiments, SAW-induced intermixing of a five monolayers thick Rh film on top of polycrystalline platinum was demonstrated to be due to enhanced thermal diffusion caused by an increase of the surface temperature by about 75 K when SAWs were excited. Reversible surface structural changes are suggested to be a major cause for catalytic promotion. Surface acoustic waves (SAWs) are dynamic lattice distortions, which can be excited on piezoelectric materials. For many years a promotion of the catalytic activity and selectivity by SAWs has been known, but no mechanistic understanding has been established yet. We quantify the effect that SAWs have on the electronic and geometric structure of a model catalyst, providing a basis for discussing the promotion mechanism of SAWs in catalytic surface reactions.
publishDate 2020
dc.date.none.fl_str_mv 2
2020-01-01
2020
2020-01-01
dc.type.none.fl_str_mv 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://ddd.uab.cat/record/238791
https://dx.doi.org/urn:doi:10.1002/anie.202005883
url https://ddd.uab.cat/record/238791
https://dx.doi.org/urn:doi:10.1002/anie.202005883
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 730872
Agencia Estatal de Investigación https://doi.org/10.13039/501100011033 RTI2018-095303-B-C53
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 RYC-2014-16515
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2015-69144-P
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2015-0496
Agencia Estatal de Investigación https://doi.org/10.13039/501100011033 MAT2017-85232-R
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-nc/4.0/
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
https://creativecommons.org/licenses/by-nc/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
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repository.mail.fl_str_mv
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