2 research outputs found
Role of PdO<sub><i>x</i></sub> and RuO<sub><i>y</i></sub> Clusters in Oxygen Exchange between Nanocrystalline Tin Dioxide and the Gas Phase
No full textThe 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 SnO<sub>2</sub> by palladium and,
to a larger extent, by ruthenium, increases surface oxygen concentration
on the materials. The revealed effects on oxygen exchangeî—¸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 diffusionî—¸were
more intensive for Ru-modified SnO<sub>2</sub> than in the case of
SnO<sub>2</sub>/Pd. The superior promoting activity of ruthenium on
tin dioxide interaction with oxygen was interpreted by favoring the
dissociative O<sub>2</sub> adsorption and increasing the oxygen mobility,
taking into account the structure and chemical composition of the
modifier clusters
Role of PdO<sub><i>x</i></sub> and RuO<sub><i>y</i></sub> Clusters in Oxygen Exchange between Nanocrystalline Tin Dioxide and the Gas Phase
No full textThe 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 SnO<sub>2</sub> by palladium and,
to a larger extent, by ruthenium, increases surface oxygen concentration
on the materials. The revealed effects on oxygen exchangeî—¸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 diffusionî—¸were
more intensive for Ru-modified SnO<sub>2</sub> than in the case of
SnO<sub>2</sub>/Pd. The superior promoting activity of ruthenium on
tin dioxide interaction with oxygen was interpreted by favoring the
dissociative O<sub>2</sub> adsorption and increasing the oxygen mobility,
taking into account the structure and chemical composition of the
modifier clusters
