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dc.contributor.authorJiménez Divins, Nuria
dc.contributor.authorLópez López, Eduardo
dc.contributor.authorAngurell Purroy, Inmaculada
dc.contributor.authorNeuberg, Stefan
dc.contributor.authorZapf, Ralf
dc.contributor.authorKolb, Gunther
dc.contributor.authorLlorca Piqué, Jordi
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2021-03-08T08:26:39Z
dc.date.available2021-03-08T08:26:39Z
dc.date.issued2020-09-07
dc.identifier.citationJ. Divins, N. [et al.]. CO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles. "Catalysts", 7 Setembre 2020, vol. 10, núm. 9, p. 1028/1-1028/21.
dc.identifier.issn2073-4344
dc.identifier.urihttp://hdl.handle.net/2117/341068
dc.description.abstractCO 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.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshOxidation
dc.subject.lcshHydrogen as fuel
dc.subject.otherPreformed Au nanoparticles
dc.subject.otherDendrons
dc.subject.otherDendrimers
dc.subject.otherThiols
dc.subject.otherCO oxidation
dc.subject.otherPROX
dc.subject.otherCO-PrOx
dc.subject.otherMicroreactor
dc.subject.otherFuel reformer
dc.subject.otherStability test
dc.titleCO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles
dc.typeArticle
dc.subject.lemacCatalitzadors
dc.subject.lemacOxidació
dc.subject.lemacHidrogen com a combustible
dc.contributor.groupUniversitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia
dc.identifier.doi10.3390/catal10091028
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://www.mdpi.com/2073-4344/10/9/1028/htm
dc.rights.accessOpen Access
local.identifier.drac29280351
dc.description.versionPostprint (published version)
local.citation.authorJ. Divins, N.; López, E.; Angurell, I.; Neuberg, S.; Zapf, R.; Kolb, G.; Llorca, J.
local.citation.publicationNameCatalysts
local.citation.volume10
local.citation.number9
local.citation.startingPage1028/1
local.citation.endingPage1028/21


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Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain