| Autor: |
Marikutsa, Artem V., Rumyantseva, Marina N., Frolov, Dmitry D., Morozov, Igor V., Boltalin, Alexander I., Fedorova, Anna A., Petukhov, Ilya A., Yashina, Lada V., Konstantinova, Elizaveta A., Sadovskaya, Ekaterina M., Abakumov, Artem M., Zubavichus, Yan V., Gaskov, Alexander M. |
| Zdroj: |
The Journal of Physical Chemistry - Part C; November 2013, Vol. 117 Issue: 45 p23858-23867, 10p |
| Abstrakt: |
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 SnO2by palladium and, to a larger extent, by ruthenium, increases surface oxygen concentration on the materials. The revealed effects on oxygen exchangelowering 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 diffusionwere more intensive for Ru-modified SnO2than in the case of SnO2/Pd. The superior promoting activity of ruthenium on tin dioxide interaction with oxygen was interpreted by favoring the dissociative O2adsorption and increasing the oxygen mobility, taking into account the structure and chemical composition of the modifier clusters. |
| Databáze: |
Supplemental Index |
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