Catalytic impact of RuOx clusters to high ammonia sensitivity of tin dioxide

Marikutsa, Artem; Krivetskiy, Valeriy; Yashina, Lada V.; Rumyantseva, M. N.; Константинова, Е. А.; Ponzoni, Andrea; Comini, Elisabetta; Abakumov, Artem M.; Gaskov, Alexander

doi:10.1016/j.snb.2012.03.003

Cited by 25 publications

(57 citation statements)

References 22 publications

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“…The ESR signals of Ru 3? were observed in different types of zeolites [24][25][26], in Ru/MgF 2 catalysts [27] and in Ru/SnO 2 solids [28,29]. In this study, the Ru 3?…”

Section: Resultssupporting

confidence: 48%

ESR Investigation of Active Sites in Ru/CeO2 Solids

et al. 2016

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Two Ru/CeO 2 catalysts with Ru loadings of 1.65 and 5 wt% were prepared by wet impregnation. The adsorption of propylene or toluene led to two different ESR signals corresponding to two different catalytic sites. These two sites are present among the well dispersed ruthenium oxide species that reduce at *74°C. One site is un-reactive unless activated to remove adsorbed water while the second site is reactive at room temperature. Both sites are easily regenerated under oxidative atmosphere at 200°C. These two sites are optimally obtained for calcination temperatures in the 500-600°C interval and a Ru loading of 1.65 wt%. For Ru5Ce, the same reactive sites are present along with agglomerated ruthenium oxide species that are less reactive in oxidation reactions. Graphical Abstract2500 2750 3000 3250 3500 3750 4000 S 3

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“…The ESR signals of Ru 3? were observed in different types of zeolites [24][25][26], in Ru/MgF 2 catalysts [27] and in Ru/SnO 2 solids [28,29]. In this study, the Ru 3?…”

Section: Resultssupporting

confidence: 48%

ESR Investigation of Active Sites in Ru/CeO2 Solids

et al. 2016

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“…However, the appropriate choice of a modifier is a non-trivial issue, since in the complex process of gas sensing not only the catalytic activity of clusters, but also their interference with the oxide surface sites, defines the sensor characteristics of modified material [21,22]. In our recent works, we demonstrated that nanocrystalline tin dioxide modification by palladium oxide increased sensor responses to CO at as low temperature as room temperature [23]; while introducing ruthenium oxide provided high responses to NH3 at a raised temperature [24]. However, these studies dealt with individual gases.…”

Section: Open Accessmentioning

confidence: 93%

“…However, since surface oxygen species are unselective to reducing gases, the main reason for SnO2/RuOy-NH3 selectivity should be the specific catalysis of ammonia oxidation. In a recent work, we established catalytic role of RuOy clusters in deep NH3 oxidation to nitrogen oxides as the main feature reflecting increased sensitivity of SnO2/RuOy to ammonia at raised temperatures [24]. In contrast to that, ammonia is likely oxidized to N2 on the surface of PdOx-modified or blank SnO2.…”

Section: Sensing Behavior To Co + Nh3 Gases Mixturesmentioning

confidence: 94%

“…The micrographs of the nanocomposites were obtained using high-resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray (EDX) analysis with a Tecnai G2 transmission electron microscope operated at 200 kV. Characterization of the samples by X-ray diffraction (XRD), electron diffraction (ED), X-ray absorption spectroscopy (XANES and EXAFS), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) were described in our previous publications [23][24][25][26][27]. The composition and microstructure parameters of the samples are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

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Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH3 and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO2. Introducing palladium oxide provided high CO-sensitivity at 25-50 °C . Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150-200 °C , and selectivity to NH3 in presence of higher CO concentrations.

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“…In our previous works 14, 15 we showed that modification of nanocrystalline tin dioxide surface by clusters of palladium oxide yields materials highly sensitive to CO at as low as room temperature.…”

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confidence: 88%

Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies

2015

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The processes of selective interactions of gas sensitive nanocrystalline tin dioxide modified by catalytic PdO x and RuO y clusters with ppm-range concentrations of CO and NH 3 in air was studied.From simultaneous in situ work function and resistance measurements it was deduced that the modifiers promote specific interaction of gas molecules with the materials surface. In situ DRIFT studies revealed a key role of catalytic clusters in the selective gas-solid interactions. Specific CO chemisorption on Pd-sites was observed at room temperature. It is assumed to facilitate further oxidation of the molecules on the surface of SnO 2 /PdO x providing its low-temperature sensitivity to carbon monoxide. The selectivity of SnO 2 /RuO y to ammonia is due to the modifier-catalyzed deep oxidation of NH 3 molecules, which was evidenced by the evolvement of Ru-bound nitrosyl species during the interaction at raised temperature. The possible routes were suggested for specific SnO 2 /PdO x -CO and SnO 2 /RuO y -NH 3 interactions as a summary of experimental observations.

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Catalytic impact of RuOx clusters to high ammonia sensitivity of tin dioxide

Cited by 25 publications

References 22 publications

ESR Investigation of Active Sites in Ru/CeO2 Solids

ESR Investigation of Active Sites in Ru/CeO2 Solids

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies

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Catalytic impact of RuOx clusters to high ammonia sensitivity of tin dioxide

Cited by 25 publications

References 22 publications

ESR Investigation of Active Sites in Ru/CeO2 Solids

ESR Investigation of Active Sites in Ru/CeO2 Solids

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Specific Interaction of PdOx- and RuOy-Modified Tin Dioxide with CO and NH3 Gases: Kelvin Probe and DRIFT Studies

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Product

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Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies