FTIR spectroscopic investigation of oxygen spillover especially through the gas-phase. A reaction interesting in coke burning

Baumgarten, E.; Dedek, B.

doi:10.1007/bf02475822

Cited by 7 publications

(2 citation statements)

References 14 publications

(9 reference statements)

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“…1160,1161,[1194][1195][1196] However, experimental studies dealing with catalytic soot oxidation have shown that activated oxygen atoms (oxygen spillover) can migrate from the metal (Pt) to the carbon via the gas phase. 1162,[1197][1198][1199] In particular, Zeng et al have stated that activated oxygen is mainly transported via the gas phase and that the generally accepted surface transport is indeed negligible. 1199 A direct spillover of atomic oxygen on the carbon support has been first proposed by Baumgarten et al 1161 When the Pt catalyst is in direct contact with the carbon support, a dissociative adsorption of O2 on the metal followed by the spillover of atomic O to the carbon at the Pt/C interface.…”

Section: Oxygen Spillovermentioning

confidence: 99%

“…Oxygen spillover is an important phenomenon related to carbon material oxidation, which is relevant for soot oxidation or electrode deterioration in fuel cells. In many studies, spillover is proposed to occur on the surface of an oxide, which can be the support of Pt (Al 2 O 3 or SiO 2 ) or the catalyst itself (transition metal oxides or CeO 2 ). ,,− However, experimental studies dealing with catalytic soot oxidation have shown that activated oxygen atoms (oxygen spillover) can migrate from the metal (Pt) to the carbon via the gas phase. ,− In particular, Zeng et al have stated that activated oxygen is mainly transported via the gas phase and that the generally accepted surface transport is indeed negligible . A direct spillover of atomic oxygen on the carbon support has been first proposed by Baumgarten et al When the Pt catalyst is in direct contact with the carbon support, a dissociative adsorption of O 2 on the metal is followed by the spillover of atomic O to the carbon at the Pt/C interface .…”

Section: Why Anchoring Metal Nanoparticles Clusters or Metal Single A...mentioning

confidence: 99%

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A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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Fermi level in vii) are shown in purple in ii)-vi) with an iso-value of ±0.003 a.u. Reprinted with permission from ref 57 . Copyright 2014 from the Royal Society of Chemistry; b) Molecular model of a corannulene-like element functionalized with three carboxylic groups from two different perspectives in the cpk representation (on the left). The final structure (190 elements in a cubic cell of 60 Å in size) obtained from random packing of the individual elements (on the right). Cyan: carbon, red: oxygen, white: hydrogen. Reprinted with permission from ref 59 Copyright 2017 from Elsevier; c) Side-views of Ru13 adsorbed on Gr-DV-2COOH site before (on left panel) and after a proton jump (right panel). C atoms are in black, O in red, H in with white and Ru in mocha. Reprinted with permission from ref 60 Copyright 2014 from Elsevier; and d) Spin-density projection in µB/a.u. 2 on the graphene plane around i) the hydrogen chemisorption defect (∆) and ii) the vacancy defect in the a sublattice. Carbon atoms corresponding to the a sublattice (o) and to the b sublattice (•) are distinguished. Simulated STM images of the defects are shown in iii) and iv), respectively. Reprinted with permission from ref 61 .

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Section: Oxygen Spillovermentioning

confidence: 99%

Section: Why Anchoring Metal Nanoparticles Clusters or Metal Single A...mentioning

confidence: 99%

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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Spillover Distance of Activated Oxygen Atoms during Catalytic Soot Oxidation in Structured Layers of Nanoparticles

Zeng

Turek

Weber

2011

Chemie Ingenieur Technik

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Spillover Distance of Activated Oxygen Atoms during Catalytic Soot Oxidation in Structured Layers of NanoparticlesThe catalytic oxidation of carbon particles is an important process, e.g., in regeneration of diesel particulate filters. If the catalyst and the carbon particles are not in direct contact, a transportation step of the activated oxygen atoms (oxygen spillover) is needed. The distance of oxygen spillover in a nanoparticle layer system was studied. The system consisted of a platinum catalyst (20 lm thick) and a carbon (300 lm thick) layer that were separated by an inert SiO 2 layer with variable thickness. At moderate conversion (< 40 %), which occurs without substantial structural changes of the carbon particle layer, a distance of 160 lm was found. The spillover distance of the oxidizing species may be a starting point for the geometric design of more efficient impregnated catalytic particulate filters.

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Transport Mechanisms of Activated Oxygen in the Catalytic Soot Oxidation on Systems of Nanoparticle Layers

Zeng

Weber

2012

Chemie Ingenieur Technik

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Der Transportmechanismus von mittels Platin-Katalysator aktiviertem Sauerstoff wurde mit einem System aus Nanopartikeln-Schichten (Sandwichstruktur) untersucht. Die Ergebnisse zeigen, dass die aktivierte Sauerstoffspezies über die Gasphase transportiert wird, und dass der bisher allgemein akzeptierte Oberflächentransport (Spillover) vernachlässigbar ist.Allerdings ist die Lebensdauer der aktivierten Sauerstoffspezies sehr begrenzt. Aus Versuchen mit räumlich getrennten Pt-und C-Schichten wurde die Lebensdauer auf 65 ms abgeschätzt. Der Abbau der aktivierten Sauerstoffspezies erfolgt vermutlich über die Anlagerung an andere Gasmoleküle oder an Wände. Die Identifizierung des dominanten Transportmechanismus und Quantifizierung der katalytischen Wirkung könnte wertvolle Hinweise für die Optimierung des Designs von katalytisch beschichteten Dieselrußpartikelfiltern geben.The transport mechanism of oxygen activated on platinum catalysts was investigated with a system of nanoparticle layers (sandwich structure). The results indicate that activated oxygen is transported via the gas phase and that the generally accepted surface transport, so-called spillover, is negligible. However, the lifetime of the activated oxygen is very limited. In experiments with spatially separated Pt-and C-layers the lifetime was estimated to be 65 ms. The reduction of activated oxygen presumably occurs via attachment to other gas molecules or to reactor walls. The identification of the dominant transport mechanism and the quantification of the catalytic effect could provide valuable guidelines for the design optimization of catalytic coated diesel particulate filters.

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FTIR spectroscopic investigation of oxygen spillover especially through the gas-phase. A reaction interesting in coke burning

Cited by 7 publications

References 14 publications

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

Spillover Distance of Activated Oxygen Atoms during Catalytic Soot Oxidation in Structured Layers of Nanoparticles

Transport Mechanisms of Activated Oxygen in the Catalytic Soot Oxidation on Systems of Nanoparticle Layers

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