Electron Spin Resonance Studies of the Surface Chemistry of Rutile

Iyengar, R. D.; Codell, Maurice; Karra, J. S.; Turkevich, John

doi:10.1021/ja00974a001

Cited by 64 publications

(15 citation statements)

References 2 publications

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“…A similar effect was observed by Iyengar et a/. (13) o n TiO,. Carbon monoxide and hydrogen did not affect this signal a t room temperature indicating a negative test for the 0-ion species.…”

Section: Resultssupporting

confidence: 85%

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Electron spin resonance studies of the surface chemistry of molybdenum–alumina catalysts

Khulbe¹,

Mann²,

Ternan³

1978

Can. J. Chem.

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When alumina was doped with molybdenum oxide, the concentration of the electron accepting sites increased linearly up to 18 wt% MoO3, and then decreased. The colour of the Mo–alumina changed from whitish yellow to grayish black when degassed at 320 °C for 2 h. This depended on the concentration of Mo. A strong signal for Mo5+ was observed. Oxygen species were formed when the degassed sample was treated with oxygen or air. A reversible behaviour of oxygen on these species was observed. A possible mechanism has been discussed for the formation of O2− species and the reversible behaviour of oxygen. The concentration of electron accepting centers has been correlated with the activity for the hydrodenitrogenation of heavy oils over MoO3–alumina catalysts.

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Section: Resultssupporting

confidence: 85%

“…3, 111) was due to the 0,-species. A similar effect of 0, was observed on rutile (13 On evacuating the adsorbed O,, 0,-ions remained behind and gave the esr spectra at g = 2.010. The disappearance of the 0,-signal in the presence of 0, may be due to dipolar magnetic broadening by molecular 0,.…”

Section: Discussionsupporting

confidence: 67%

Electron spin resonance studies of the surface chemistry of molybdenum–alumina catalysts

Khulbe¹,

Mann²,

Ternan³

1978

Can. J. Chem.

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“…SOVs) induced by conduction electrons trapped at Ti 4 + sites. [32] This phenomenon can also be observed in the above three TiO 2 samples used for XPS test- This color change of TiO 2 can also be observed after TPD testing. It is found that the introduction of H 2 into TiO 2 can promote the color change of TiO 2 from light to dark during testing.…”

Section: Analysis Of Sovs At the Tio 2 Surfacementioning

confidence: 53%

Photocatalytic Oxidation of CO on TiO₂: Chemisorption of O₂, CO, and H₂

et al. 2009

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On the surface: Adsorption of O(2) at the surface oxygen vacancy (SOV) sites of TiO(2) reconstructs the lattice oxygen (healing SOVs), resulting in a decrease of the photocatalytic activity of oxidizing CO over vacuum-pretreated TiO(2) with increasing temperature (see scheme). Adsorption of H(2) produces new SOVs at the TiO(2) surface and stabilizes the photocatalytic activity. Photocatalytic oxidation of CO over vacuum-pretreated TiO(2) is performed in a series of systems with the introduction of O(2), CO, and H(2) in different orders. The photocatalytic oxidation of CO is dependent on the order of introduction of O(2), CO, or H(2), and introducing O(2) prior to CO promotes the oxidation of CO. Moreover, an increase of reaction temperature suppresses the oxidation of CO, but the preintroduction of H(2) reduces this suppression effect. The results of the chemisorption of O(2), CO, and H(2) at the TiO(2) surface reveal that the adsorbed O(2) heals the surface oxygen vacancy (SOV) sites of TiO(2), while the adsorbed CO and H(2) promote the formation of new SOVs. It is proposed that changes in the amounts of adsorbed O(2) and SOVs are mainly responsible for the differences of CO conversion in different systems.

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“…Early in 1968, Sancier ascribed the triplet as a solid state defect but did not identify the paramagnetic species [38]. Later, Iyengar et al assigned it to some paramagnetic nitrogen oxides (such as NO, NO 2 , NO 2 − , and NO 2 2− ) [39,40]. Recently, many studies have reported on the similar triplet signal of N-doped TiO 2 .…”

Section: Characteristics Of Relevant Samplesmentioning

confidence: 99%

Visible light active N-doped TiO2 prepared from different precursors: Origin of the visible light absorption and photoactivity

Wang

Feng

Zhang

et al. 2011

Applied Catalysis B: Environmental

131

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Electron Spin Resonance Studies of the Surface Chemistry of Rutile

Cited by 64 publications

References 2 publications

Electron spin resonance studies of the surface chemistry of molybdenum–alumina catalysts

Electron spin resonance studies of the surface chemistry of molybdenum–alumina catalysts

Photocatalytic Oxidation of CO on TiO₂: Chemisorption of O₂, CO, and H₂

Visible light active N-doped TiO2 prepared from different precursors: Origin of the visible light absorption and photoactivity

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Electron Spin Resonance Studies of the Surface Chemistry of Rutile

Cited by 64 publications

References 2 publications

Electron spin resonance studies of the surface chemistry of molybdenum–alumina catalysts

Electron spin resonance studies of the surface chemistry of molybdenum–alumina catalysts

Photocatalytic Oxidation of CO on TiO2: Chemisorption of O2, CO, and H2

Visible light active N-doped TiO2 prepared from different precursors: Origin of the visible light absorption and photoactivity

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Photocatalytic Oxidation of CO on TiO₂: Chemisorption of O₂, CO, and H₂