FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3174773059> ?p ?o ?g. }

• W3174773059 abstract "Bimetallic catalysts based on Pt and Sn are used for commercial alkane dehydrogenation processes and also exhibit promising activities for the preferential oxidation of CO [1,2]. It was recently shown that the structure of Pt-Sn particles dramatically evolved when going from a reducing atmosphere to one containing O2 [1,3]. Pt-Sn alloyed phases are readily destroyed in the presence of O2, leading to Pt highly dispersed in SnOx domains [1,3].We have further investigated the structure of Pt-Sn nanoparticles under reducing conditions, always free of O2. Surprisingly, we observed by in situ diffuse reflectance IR spectroscopy (DRIFTS) that the alloy phase was not stable under (i) H2-free CO at any temperature or (ii) CO/H2 mixtures at temperatures below 175°C. The DRIFTS data (figure 1.left) show that bands typical of CO adsorbed on Pt-Sn phases (ca. 2046 cm-1) are readily replaced with bands associated with Pt phases (> 2060 cm-1). Even more surprising, X-ray photoelectron spectroscopy (XPS) revealed that the proportion of oxidized Sn increased from about 38% to 69% following exposure to pure CO (Fig. 1.middle and right). The XPS results were confirmed by in situ X-ray absorption spectroscopy, in particular XANES analysis carried out at the Sn K edge (data not shown).These observations could be rationalized by the known, albeit very slow, ability of Pt to dissociate CO [4] and we propose that the oxygen atoms formed readily reacted with metallic Sn to form a SnOx phase, leading to Pt-Sn destruction, alongside carbon deposition. A similar scheme had been proposed to explain silver oxidation in the presence of CO at room temperature [5]. These data highlight an important phenomenon affecting metal and alloy stability under CO, which is of strong interest to both heterogeneous catalysis and electrochemical communities.[1] A. Moscu, L. Veyre, C. Thieuleux, F.C. Meunier, Y. Schuurman, Catal. Today, 258 (2015) 241-246.[2] A. Moscu, Y. Schuurman, L. Veyre, C. Thieuleux, F.C. Meunier, Chem. Commun. 50 (2014) 8590-8592.[3] W.D. Michalak, J.M. Krier, S. Alayoglu, J.Y. Shin, K. Komvopoulos, Z. Liu, G.A. Somorjai, J. Catal. 312 (2014) 17-25.[4] Y. Iwasawa, R. Mason, M. Textor, G.C. Somorjai, Chem. Phys. Lett., 44 (1976) 468-470.[5] K. Bechoux, O. Marie, M Daturi, G. Delahay, C. Petitto, S. Rousseau, G. Blanchard, Cat. Today 197 (2012) 155–161" @default.
• W3174773059 created "2021-07-05" @default.
• W3174773059 creator A5016842973 @default.
• W3174773059 creator A5038272234 @default.
• W3174773059 creator A5075528290 @default.
• W3174773059 date "2017-08-27" @default.
• W3174773059 modified "2023-09-26" @default.
• W3174773059 title "CO dissociation on Pt-Sn nanoparticles as the unexpected trigger for alloy oxidation and segregation under O2-free conditions." @default.
• W3174773059 hasPublicationYear "2017" @default.
• W3174773059 type Work @default.
• W3174773059 sameAs 3174773059 @default.
• W3174773059 citedByCount "0" @default.
• W3174773059 crossrefType "proceedings-article" @default.
• W3174773059 hasAuthorship W3174773059A5016842973 @default.
• W3174773059 hasAuthorship W3174773059A5038272234 @default.
• W3174773059 hasAuthorship W3174773059A5075528290 @default.
• W3174773059 hasConcept C102931765 @default.
• W3174773059 hasConcept C127413603 @default.
• W3174773059 hasConcept C147789679 @default.
• W3174773059 hasConcept C155672457 @default.
• W3174773059 hasConcept C171250308 @default.
• W3174773059 hasConcept C185592680 @default.
• W3174773059 hasConcept C191897082 @default.
• W3174773059 hasConcept C192562407 @default.
• W3174773059 hasConcept C2780026712 @default.
• W3174773059 hasConcept C42360764 @default.
• W3174773059 hasConcept C75473681 @default.
• W3174773059 hasConceptScore W3174773059C102931765 @default.
• W3174773059 hasConceptScore W3174773059C127413603 @default.
• W3174773059 hasConceptScore W3174773059C147789679 @default.
• W3174773059 hasConceptScore W3174773059C155672457 @default.
• W3174773059 hasConceptScore W3174773059C171250308 @default.
• W3174773059 hasConceptScore W3174773059C185592680 @default.
• W3174773059 hasConceptScore W3174773059C191897082 @default.
• W3174773059 hasConceptScore W3174773059C192562407 @default.
• W3174773059 hasConceptScore W3174773059C2780026712 @default.
• W3174773059 hasConceptScore W3174773059C42360764 @default.
• W3174773059 hasConceptScore W3174773059C75473681 @default.
• W3174773059 hasLocation W31747730591 @default.
• W3174773059 hasLocation W31747730592 @default.
• W3174773059 hasOpenAccess W3174773059 @default.
• W3174773059 hasPrimaryLocation W31747730591 @default.
• W3174773059 hasRelatedWork W1991986159 @default.
• W3174773059 hasRelatedWork W2089251307 @default.
• W3174773059 hasRelatedWork W2322045178 @default.
• W3174773059 hasRelatedWork W2748952813 @default.
• W3174773059 hasRelatedWork W2783283445 @default.
• W3174773059 hasRelatedWork W2899084033 @default.
• W3174773059 hasRelatedWork W2996358649 @default.
• W3174773059 hasRelatedWork W3016721682 @default.
• W3174773059 hasRelatedWork W4248400276 @default.
• W3174773059 hasRelatedWork W4303926928 @default.
• W3174773059 isParatext "false" @default.
• W3174773059 isRetracted "false" @default.
• W3174773059 magId "3174773059" @default.
• W3174773059 workType "article" @default.