The desorption of O2 during NO and N2O decomposition on Cu- and Fe-zeolites

Valyon, József; Millman, W. S.; Hall, W. Keith

doi:10.1007/bf00811794

Cited by 92 publications

(37 citation statements)

References 12 publications

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“…The involvement of oxygens from Fe-Y, Fe-mordenite and Fe-ZSM-5 during the decomposition of nitrous oxide above 350°C was reported by Hall and co-workers using either 18 O exchanged zeolite or 18 O labeled N 2 O [1][2][3]. These authors assume that ca.…”

Section: Introductionmentioning

confidence: 85%

Role of Zeolitic Oxygens During the Decomposition of 15N218O Over Fe-ferrierite

2005

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Isotopic species of dioxygen released during the decomposition of 15 N 2 18 O over Fe-ferrierite show that the zeolite oxygens participate in the reaction. While Fe-ferrierite alone does not exchange its oxygens with 18 O 2 below 400°C, this exchange is very rapid in the mixture of 18 O 2 +N 2 O. The amount of participating zeolite oxygen (ca. 1-6 per iron atom) is practically the same in the latter case as in the decomposition of 15 N 2 18 O. The time dependence of individual dioxygen isotope species released during the 15 N 2 18 O decomposition points to the primary release of 18 O 2 which is very rapidly exchanged for the zeolite oxygen by a single-step mechanism. KEY WORDS: Fe-ferrierite; decomposition of 15 N 2 18 O; participation of zeolite oxygens.

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Section: Introductionmentioning

confidence: 85%

Role of Zeolitic Oxygens During the Decomposition of 15N218O Over Fe-ferrierite

2005

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“…The use of Fe-MFI systems for direct N 2 O decomposition has been described in several publications [1][2][3][4]. Fe-ZSM5 catalysts have also attracted much attention due to their extraordinary activity for hydrocarbon-assisted reduction of N 2 O [5,6], N 2 O reduction by NH 3 [7], oxidation of benzene to phenol (Panov's group [8]), and selective catalytic reduction (SCR) of NO x with hydrocarbons [9][10][11][12] and NH 3 [13].…”

Section: Introductionmentioning

confidence: 99%

Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Melián‐Cabrera

Espinosa

Groen

et al. 2006

Journal of Catalysis

113

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“…These results indicate that Cu catalyzes the recombination of O atoms in a LH reaction. The catalytic action of Cu is well known and is believed to result from its ability to change between the +1 and +2 oxidation states [52][53][54][55]. Fe is known to behave similarly, cycling between Fe 2+ and Fe 3+ [56].…”

Section: Determination Of Recombination Coefficients Using the Spinnimentioning

confidence: 99%

Experimental and modeling study of O and Cl atoms surface recombination reactions in O2 and Cl2 plasmas

Stafford

Guha

Khare

et al. 2010

Pure and Applied Chemistry

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Abstract:In low-pressure plasmas commonly used in materials processing, plasma-wall inter actions play a crucial role in the evolution of the plasma properties both over time and across large-area wafers. We have recently studied the heterogeneous recombination of O and Cl atoms on reactor walls in O 2 and Cl 2 plasmas through both experiments and modeling. The Langmuir-Hinshelwood (i.e., delayed) recombination was investigated using a "spinning-wall" technique in which a portion of the substrate surface is periodically exposed to an inductively coupled plasma and to a differentially pumped chamber where either Auger electron spectroscopy (AES) or line-of-sight mass spectrometry (MS) is used to detect surface and desorbing species. In this paper, a review of the various effects driving the O and Cl atoms recombination dynamics on anodized aluminum (AA) and stainless steel (SS) surfaces is presented. It is shown that recombination probabilities, γ, can vary following plasma exposure due to surface conditioning. In Cl 2 plasmas, γ was also found to depend on the Cl-toCl 2 number density ratio, a mechanism ascribed to a competition for adsorption sites between Cl and Cl 2 . We have also determined the recombination rates of Cl atoms in Cl 2 high-density plasmas sustained by electromagnetic surface waves by comparing the measured degrees of dissociation of Cl 2 to those predicted by an isothermal fluid model. For a reactor with large SS and quartz surfaces exposed to the plasma, γ values and their dependence on the Cl-toCl 2 number density ratio were consistent with those obtained from the rotating substrate technique. Similar values were obtained for plasmas sustained in a quartz discharge tube. It is expected that for plasmas sustained in or adjacent to a silica tube or plate, the Cl atoms recombination coefficient becomes independent of chamber wall material due to reactor seasoning, producing a silicon-oxychloride layer.

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The desorption of O2 during NO and N2O decomposition on Cu- and Fe-zeolites

Cited by 92 publications

References 12 publications

Role of Zeolitic Oxygens During the Decomposition of 15N218O Over Fe-ferrierite

Role of Zeolitic Oxygens During the Decomposition of 15N218O Over Fe-ferrierite

Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Experimental and modeling study of O and Cl atoms surface recombination reactions in O2 and Cl2 plasmas

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