Role of PdOx and RuOy Clusters in Oxygen Exchange between Nanocrystalline Tin Dioxide and the Gas Phase

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• 作者：Artem V. Marikutsa ; Marina N. Rumyantseva ; Dmitry D. Frolov ; Igor V. Morozov ; Alexander I. Boltalin ; Anna A. Fedorova ; Ilya A. Petukhov ; Lada V. Yashina ; Elizaveta A. Konstantinova ; Ekaterina M. Sadovskaya ; Artem M. Abakumov ; Yan V. Zubavichus ; Alexander M. Gaskov
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 14, 2013
• 年：2013
• 卷：117
• 期：45
• 页码：23858-23867
• 全文大小：647K
• 年卷期：v.117,no.45(November 14, 2013)
• ISSN：1932-7455

文摘

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鈥揼el prepared SnO₂ by palladium and, to a larger extent, by ruthenium, increases surface oxygen concentration on the materials. The revealed effects on oxygen exchange鈥攍owering 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鈥攚ere 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 O₂ adsorption and increasing the oxygen mobility, taking into account the structure and chemical composition of the modifier clusters.