2013
DOI: 10.1021/jp408646k
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Role of PdOx and RuOy Clusters in Oxygen Exchange between Nanocrystalline Tin Dioxide and the Gas Phase

Abstract: 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 SnO 2 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 hete… Show more

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Cited by 31 publications
(34 citation statements)
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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 It is worth noting that in similar conditions we observed considerable CO 2 generation for Ptdoped SnO 2 and WO 3 for very similar or lower sensor effects 38,39 . This suggests that the undoped SnO 2 surface reduction is very limited, which is not unexpected: temperature programmed isotopic exchange experiments using mass spectrometry have shown that a high level of oxygen activation of undoped SnO 2 surfaces occurs at temperatures above 450 to 550 °C 40 . Accordingly, at 300 °C the oxidation/reduction sites should be not that many.…”
Section: Acs Paragon Plus Environmentmentioning
confidence: 86%
“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 It is worth noting that in similar conditions we observed considerable CO 2 generation for Ptdoped SnO 2 and WO 3 for very similar or lower sensor effects 38,39 . This suggests that the undoped SnO 2 surface reduction is very limited, which is not unexpected: temperature programmed isotopic exchange experiments using mass spectrometry have shown that a high level of oxygen activation of undoped SnO 2 surfaces occurs at temperatures above 450 to 550 °C 40 . Accordingly, at 300 °C the oxidation/reduction sites should be not that many.…”
Section: Acs Paragon Plus Environmentmentioning
confidence: 86%
“…The size of PdOx and RuOy clusters were estimated at 1-5 nm, while those of aggregates of tin dioxide particles reached 20-80 nm. Previously, we demonstrated micrographs of PdOx clustered on SnO2 crystallites with a size of more than 50 nm (tin dioxide annealed at 700 °C ) that was detectable by HRTEM [27]. …”
Section: Materials Composition and Microstructurementioning
confidence: 93%
“…Hence, SnO2/RuOy is selective to ammonia in comparison with CO when the gases are mixed in a ppm-concentration level with air. Previously, the additive of RuOy was found to promote oxygen spillover and dissociation on the surface of SnO2/RuOy to a larger extent than on SnO2 or SnO2/PdOx [27]. This resulted in the highest promotion of oxygen species on the surface of SnO2/RuOy, comparing to other samples [28].…”
Section: Sensing Behavior To Co + Nh3 Gases Mixturesmentioning
confidence: 94%
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“…Temperature profiles of hydrogen consumption during temperature-programmed reduction (TPR) of the materials are shown in Figure 7A. Prominent hydrogen consumption was detected at temperature 150-600 • C, but bulk reduction of ZnO was not achieved on heating to 900 • C. In the lower-temperature range 150-450 • C the consumption of H 2 is attributable to the reduction of chemisorbed oxygen species (Marikutsa et al, 2013):…”
Section: Effect Of Additive On Surface Species Of Zno/in 2 Omentioning
confidence: 99%