NDLI: Decomposition behavior of platinum clusters supported on ceria and γ-alumina in the presence of carbon monoxide

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Catalysis Science & Technology Vol - 7 Issue - 2

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Decomposition behavior of platinum clusters supported on ceria and γ-alumina in the presence of carbon monoxide

Content Provider	Royal Society of Chemistry (RSC)
Author	Aleksandrov, Hristiyan A. Koleva, Iskra Z. Vayssilov, Georgi N.
Copyright Year	2017
Abstract	Since the catalytic behavior of supported platinum species strongly depends on their nuclearity under the reaction conditions, in this study we addressed the stability of platinum species in the presence of CO. We applied density functional modeling to clarify the effect of the CO coverage on the structure and stability of small platinum clusters deposited on CeO2(111) and γ-Al2O3(001) surfaces and on a ceria nanoparticle. The stability was evaluated with respect to decomposition of the clusters to Pt, Pt0(CO) and/or Pt2+(CO)2 species. The results suggest that decomposition of pristine platinum clusters to Pt0 atoms is endothermic on all considered supports. On the other hand, the formation of Pt0(CO) monocarbonyls is essentially energy-neutral when the platinum cluster deposited on the ceria nanoparticle or ceria (111) surface is fully covered by CO molecules. Formation of Pt2+(CO)2 species can occur only when the support is a small ceria nanoparticle which ensures low-coordinated O centers and easily reducible Ce4+ ions. On the γ-Al2O3(001) surface, the platinum cluster remains stable with respect to decomposition even when it is fully covered by CO but the interaction of the cluster with the alumina surface is strongly weakened. Thus, based on the results, one may suppose that under CO pressure platinum clusters behave differently depending on the support – decomposition to neutral monocarbonyls on the ceria surface and to cationic complexes on the ceria nanoparticle, while on alumina the carbonylated cluster remains intact but is almost detached from the surface.
Starting Page	734
Ending Page	742
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	7
Issue Number	3
Journal	Catalysis Science & Technology
DOI	10.1039/c6cy02586b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Endothermic process Aluminium oxide Nanoparticle Cerium(IV) oxide CO
Content Type	Text
Resource Type	Article
Subject	Catalysis

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