Characterization and Reactivity of Mononuclear Oxygen Species on Oxide Surfaces

Che, M.; Tench, A. J.

doi:10.1016/s0360-0564(08)60453-8

Cited by 403 publications

(301 citation statements)

References 156 publications

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“…Both samples exhibited a new band appearing at 913 and 938 cm −1 , respectively, which was assigned to a surface atomic oxygen species. 13,28,29 Oppositely, no surface atomic oxygen formed on the surface of SBA-15 and Fe 2 O 3 /SBA-15 with ozone aqueous solution (SI Figure S13). These results indicated that ozone was decomposed into a surface atomic oxygen when it was adsorbed on stronger Lewis acid sites of Al 2 O 3 @SBA-15, while the ozone adsorbed on Lewis acid sites of iron was not converted into the surface atomic oxygen.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanism of Catalytic Ozonation in Fe₂O₃/Al₂O₃@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

Bing

Nie

et al. 2015

Environ. Sci. Technol.

317

120

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Fe 2 O 3 and/or Al 2 O 3 were supported on mesoporous SBA-15 by wet impregnation and calcinations with AlCl 3 and FeCl 3 as the metal precursor and were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectra (FTIR) of adsorbed pyridine. Fe 2 O 3 /Al 2 O 3 @SBA-15 was found to be highly effective for the mineralization of ibuprofen aqueous solution with ozone. The characterization studies showed that Al−O−Si was formed by the substitution of Al 3+

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Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanism of Catalytic Ozonation in Fe₂O₃/Al₂O₃@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

Bing

Nie

et al. 2015

Environ. Sci. Technol.

317

120

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“…Figure 4 outlines the possible steps of the reaction mechanism. Reaction R1 is the broadly supported mechanism for adsorption of oxygen on a metal oxide [93][94][95] [91] proposal of a bridging metal-oxygen-carbon transition state lattice oxygen from the catalyst is then transferred to the carbonaceous material, in this case to form a semi-quinone species (R2). The reaction leaves a reduced surface site in the metal oxide, which is reoccupied according to R1.…”

Section: Catalytic Oxidation In Tight Contactmentioning

confidence: 99%

Importance of the oxygen bond strength for catalytic activity in soot oxidation

Christensen

Grunwaldt

Jensen

2016

Applied Catalysis B: Environmental

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The oxygen bond strength on a catalyst, as measured by the heat of oxygen chemisorption, is observed to be a very important parameter for the activity of the catalyst in soot oxidation. With both intimate contact between soot and catalyst (tight contact) and with the solids stirred loosely together (loose contact) the rate constants for a number of catalytic materials outline a volcano curve when plotted against their heats of oxygen chemisorption. However, the optima of the volcanoes correspond to different heats of chemisorption for the two contact situations. In both cases the activation energies for soot oxidation follow linear Brønsted-Evans-Polanyi relationships with the heat of oxygen chemisorption. Among the tested metal or metal oxide catalysts Co 3 O 4 and CeO 2 were nearest to the optimal bond strength in tight contact oxidation, while Cr 2 O 3 was nearest to the optimum in loose contact oxidation. The optimum of the volcano curve in loose contact is estimated to occur between the bond strengths of α-Fe 2 O 3 and α-Cr 2 O 3 . Guided by an interpolation principle Fe a Cr b O x binary oxides were tested, and the activity of these oxides was observed to pass through an optimum for an FeCr 2 O x binary oxide catalyst, which exhibited a rate constant at 550 °C that was 2.3 times higher than the one for pure α-Cr 2 O 3 and 29 times higher than the one for pure α-Fe 2 O 3 .

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“…The second case is that of the ionic triatomic oxygen species observed on several oxides (36,37). These are two species: the ozonide ion which shows stability and g values very different from those of 02(ads) and the T-shaped "so-called" ozonide.…”

Section: (2) Assignmentsmentioning

confidence: 99%

A novel type of active site at the surface of crystalline SiO₂ (a-quartz) and its possible impact on pathogenicity

Costa¹,

Fubini²,

Giamello³

et al. 1991

Can. J. Chem.

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A new type of surface site, different from those previously described, which gives rise to a paramagnetic oxygen species upon adsorption of 0 2 at low temperature, has been found at the surface of crystalline quartz. This site is abundant on freshly cleaved surfaces or on chemically etched ones but absent on crystal growth faces or on samples annealed at high temperature. The abundance of this site is not related to the other surface radicals characteristic of the quartz surface originated by mechanical grinding in air. The EPR spectral features of the signal suggest an ozonide type radical 03-. The adsorption of oxygen onto quartz dusts variously treated in order to modulate their fibrogenic potential in vivo indicates that a relationship may exist between the presence of this site and quartz pathogenicity.Key words: quartz, oxygen radical species, ozonide, silicosis, EPR.DOMINIQUE COSTA, BICE FUBINI, ELIO GIAMELLO et MARCO VOLANTE. Can. J. Chern. 69, 1427 (1991).On a trouvC i la surface du quartz cristallin un nouveau site de surface, diffkrent de ceux dCcrits anterieurement, qui conduit i une espkce d'oxygkne paramagnktique lors de l'adsorption de l'oxygkne i basse tempkrature. Ce site se trouve en abondance sur les surfaces fraichement coupCes ou sur celles qui sont dCcapCes alors qu'il est absent sur les faces des cristaux en croissance ou sur des Cchantillons condensCs i haute tempirature. L'abondance de ce site n'est pas reliC aux radicaux de surface caractCristiques de la surface du quartz travaillke par broyage mkcanique dans l'air. Les caractkristiques spectrales du signal en W E suggkrent un radical du type ozonide 0 3 -. L'adsorption de l'oxyg5ne sur de la poussikre de quartz, traitke de diffCrentes faqons dans le but de moduler leur potentiel fibrogknique in vivo, indique qu'il peut exister une relation entre la prCsence de ce site et la pathonCgicitC du quartz.

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Characterization and Reactivity of Mononuclear Oxygen Species on Oxide Surfaces

Cited by 403 publications

References 156 publications

Mechanism of Catalytic Ozonation in Fe₂O₃/Al₂O₃@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

Mechanism of Catalytic Ozonation in Fe₂O₃/Al₂O₃@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

Importance of the oxygen bond strength for catalytic activity in soot oxidation

A novel type of active site at the surface of crystalline SiO₂ (a-quartz) and its possible impact on pathogenicity

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Characterization and Reactivity of Mononuclear Oxygen Species on Oxide Surfaces

Cited by 403 publications

References 156 publications

Mechanism of Catalytic Ozonation in Fe2O3/Al2O3@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

Mechanism of Catalytic Ozonation in Fe2O3/Al2O3@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

Importance of the oxygen bond strength for catalytic activity in soot oxidation

A novel type of active site at the surface of crystalline SiO2 (a-quartz) and its possible impact on pathogenicity

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Product

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Mechanism of Catalytic Ozonation in Fe₂O₃/Al₂O₃@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

Mechanism of Catalytic Ozonation in Fe₂O₃/Al₂O₃@SBA-15 Aqueous Suspension for Destruction of Ibuprofen

A novel type of active site at the surface of crystalline SiO₂ (a-quartz) and its possible impact on pathogenicity