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dc.contributor.author
Divins, Núria J.
dc.contributor.author
Lopez, Eduardo
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Angurell, Inmaculada
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Neuberg, Stefan
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Zapf, Ralf
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Kolb, Gunther
dc.contributor.author
Llorca Piqué, Jordi
dc.date.available
2021-03-01T15:09:10Z
dc.date.issued
2020-09-07
dc.identifier.citation
Divins, Núria J.; Lopez, Eduardo; Angurell, Inmaculada; Neuberg, Stefan; Zapf, Ralf; et al.; CO Total and preferential oxidation over stable Au/TiO2 catalysts derived from preformed au nanoparticles; Molecular Diversity Preservation International; Catalysts; 10; 9; 7-9-2020; 1-20
dc.identifier.issn
2073-4344
dc.identifier.uri
http://hdl.handle.net/11336/126974
dc.description.abstract
CO preferential oxidation (PROX) is an effective method to clean reformate H2 streams to feed low-temperature fuel cells. In this work, the PROX and CO oxidation reactions were studied on preformed Au nanoparticles (NPs) supported on TiO2 anatase. Preformed Au NPs were obtained from gold cores stabilized by dodecanethiols or trimethylsilane-dendrons. A well-controlled size of ca. 2.6 nm and narrow size distributions were achieved by this procedure. The catalysts were characterized by high-resolution transmission electron microscopy and ex situ and in situ X-ray photoelectron spectroscopy (XPS). The XPS results showed that the preformed Au NPs exhibited high thermal stability. The different ligand-derived Au catalysts, as well as a conventional gold catalyst for comparison purposes, were loaded onto cordierite supports with 400 cells per square inch. The activity and selectivity of the samples were evaluated for various operation conditions. The catalyst prepared using dodecanethiol-capped Au NPs showed the best performance. In fact, CO conversions of up to 70% at 40% CO2 selectivity and 90% O2 conversion were observed operating at 363 K in H2-rich atmospheres. The performance of the best catalysts was subsequently tested on stainless steel microreactors. A 500-hour stability test was carried out under a real post-reformate stream, including 18 vol.% CO2 and 29 vol.% H2O. A mean CO conversion of ca. 24% was measured for the whole test operating at 453 K and a gas hourly space velocity (GHSV) of 1.3 × 104 h−1. These results reveal our dodecanethiol-and carbosilane-derived Au catalysts as extremely promising candidates to conduct a PROX reaction while avoiding deactivation, which is one of the major drawbacks of Au/TiO2 catalysts.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Molecular Diversity Preservation International
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
CO OXIDATION
dc.subject
CO-PROX
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DENDRIMERS
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DENDRONS
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FUEL REFORMER
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MICROREACTOR
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PREFORMED AU NANOPARTICLES
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PROX
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STABILITY TEST
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THIOLS
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Ingeniería de Procesos Químicos
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Ingeniería Química
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INGENIERÍAS Y TECNOLOGÍAS
dc.title
CO Total and preferential oxidation over stable Au/TiO2 catalysts derived from preformed au nanoparticles
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-02-18T15:18:15Z
dc.journal.volume
10
dc.journal.number
9
dc.journal.pagination
1-20
dc.journal.pais
Suiza
dc.journal.ciudad
Basilea
dc.description.fil
Fil: Divins, Núria J.. Universidad Politécnica de Catalunya; España
dc.description.fil
Fil: Lopez, Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
dc.description.fil
Fil: Angurell, Inmaculada. Universidad de Barcelona. Facultad de Química; España
dc.description.fil
Fil: Neuberg, Stefan. Fraunhofer Institute of Microengineering and Microsystems; Alemania
dc.description.fil
Fil: Zapf, Ralf. Fraunhofer Institute of Microengineering and Microsystems; Alemania
dc.description.fil
Fil: Kolb, Gunther. Fraunhofer Institute of Microengineering and Microsystems; Alemania
dc.description.fil
Fil: Llorca Piqué, Jordi. Universidad Politécnica de Catalunya; España
dc.journal.title
Catalysts
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2073-4344/10/9/1028
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3390/catal10091028
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