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Title
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Role of and clusters in oxygen exchange between nanocrystalline tin dioxide and the gas phase
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Author
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Abstract
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| The effect of palladium- and ruthenium-based clusters on nanocrystalline tin dioxide interaction with oxygen was studied by temperature-programmed oxygen isotopic exchange with mass-spectrometry detection. The modification of aqueous sol-gel prepared SnO2 by palladium and, to a larger extent, by ruthenium, increases surface oxygen concentration on the materials. The revealed effects on oxygen exchange-lowering the threshold temperature, separation of surface oxygen contribution to the process, increase of heteroexchange rate and oxygen diffusion coefficient, decrease of activation energies of exchange and diffusion-were more intensive for Ru-modified SnO2 than in the case of SnO2/Pd. The superior promoting activity of ruthenium on tin dioxide interaction with oxygen was interpreted by favoring the dissociative O-2 adsorption and increasing the oxygen mobility, taking into account the structure and chemical composition of the modifier clusters. |
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Language
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English
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Source (journal)
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The journal of physical chemistry: C : nanomaterials and interfaces. - Washington, D.C., 2007, currens
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Publication
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Washington, D.C.
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2013
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ISSN
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1932-7447
[print]
1932-7455
[online]
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DOI
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10.1021/JP408646K
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Volume/pages
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117
:45
(2013)
, p. 23858-23867
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ISI
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000327110500046
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Full text (Publisher's DOI)
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