Isotopic study of nitrous oxide decomposition on an oxidized Rh catalyst: Mechanism of oxygen desorption

H. Uetsuka; K. Aoyagi; S. Tanaka; K. Yuzaki; S. Ito; S. Kameoka; K. Kunimori

doi:10.1023/a:1019066732528

Isotopic study of nitrous oxide decomposition on an oxidized Rh catalyst: Mechanism of oxygen desorption

H. Uetsuka, K. Aoyagi, S. Tanaka, K. Yuzaki, S. Ito, S. Kameoka, K. Kunimori

IMRAM - Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

N₂O decomposition on an oxidized Rh catalyst (unsupported) has been studied using a tracer technique in order to reveal the reaction mechanism. N₂¹⁶O was pulsed onto an ¹⁸O/oxidized Rh catalyst at 493 K and desorbed O₂ molecules were monitored. The ¹⁸O fraction in the desorbed oxygen had the same value as that on the surface oxygen. The result shows that the oxygen molecules do not desorb via the Eley-Rideal mechanism, but via the Langmuir-Hinshelwood mechanism. On the other hand, desorption of oxygen from Rh surfaces (in vacuum or in He) occurs at higher temperatures, which suggests reaction-assisted desorption of oxygen during the N₂O decomposition reaction at low temperature.

Original language	English
Pages (from-to)	87-90
Number of pages	4
Journal	Catalysis Letters
Volume	66
Issue number	1-2
DOIs	https://doi.org/10.1023/a:1019066732528
Publication status	Published - 2000 May

Keywords

O isotope
NO decomposition
Oxidized Rh catalyst
Reaction mechanism

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10.1023/a:1019066732528

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title = "Isotopic study of nitrous oxide decomposition on an oxidized Rh catalyst: Mechanism of oxygen desorption",

abstract = "N2O decomposition on an oxidized Rh catalyst (unsupported) has been studied using a tracer technique in order to reveal the reaction mechanism. N216O was pulsed onto an 18O/oxidized Rh catalyst at 493 K and desorbed O2 molecules were monitored. The 18O fraction in the desorbed oxygen had the same value as that on the surface oxygen. The result shows that the oxygen molecules do not desorb via the Eley-Rideal mechanism, but via the Langmuir-Hinshelwood mechanism. On the other hand, desorption of oxygen from Rh surfaces (in vacuum or in He) occurs at higher temperatures, which suggests reaction-assisted desorption of oxygen during the N2O decomposition reaction at low temperature.",

keywords = "O isotope, NO decomposition, Oxidized Rh catalyst, Reaction mechanism",

author = "H. Uetsuka and K. Aoyagi and S. Tanaka and K. Yuzaki and S. Ito and S. Kameoka and K. Kunimori",

year = "2000",

month = may,

doi = "10.1023/a:1019066732528",

language = "English",

volume = "66",

pages = "87--90",

journal = "Catalysis Letters",

issn = "1011-372X",

publisher = "Springer Netherlands",

number = "1-2",

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TY - JOUR

T1 - Isotopic study of nitrous oxide decomposition on an oxidized Rh catalyst

T2 - Mechanism of oxygen desorption

AU - Uetsuka, H.

AU - Aoyagi, K.

AU - Tanaka, S.

AU - Yuzaki, K.

AU - Ito, S.

AU - Kameoka, S.

AU - Kunimori, K.

PY - 2000/5

Y1 - 2000/5

N2 - N2O decomposition on an oxidized Rh catalyst (unsupported) has been studied using a tracer technique in order to reveal the reaction mechanism. N216O was pulsed onto an 18O/oxidized Rh catalyst at 493 K and desorbed O2 molecules were monitored. The 18O fraction in the desorbed oxygen had the same value as that on the surface oxygen. The result shows that the oxygen molecules do not desorb via the Eley-Rideal mechanism, but via the Langmuir-Hinshelwood mechanism. On the other hand, desorption of oxygen from Rh surfaces (in vacuum or in He) occurs at higher temperatures, which suggests reaction-assisted desorption of oxygen during the N2O decomposition reaction at low temperature.

AB - N2O decomposition on an oxidized Rh catalyst (unsupported) has been studied using a tracer technique in order to reveal the reaction mechanism. N216O was pulsed onto an 18O/oxidized Rh catalyst at 493 K and desorbed O2 molecules were monitored. The 18O fraction in the desorbed oxygen had the same value as that on the surface oxygen. The result shows that the oxygen molecules do not desorb via the Eley-Rideal mechanism, but via the Langmuir-Hinshelwood mechanism. On the other hand, desorption of oxygen from Rh surfaces (in vacuum or in He) occurs at higher temperatures, which suggests reaction-assisted desorption of oxygen during the N2O decomposition reaction at low temperature.

KW - O isotope

KW - NO decomposition

KW - Oxidized Rh catalyst

KW - Reaction mechanism

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EP - 90

JO - Catalysis Letters

JF - Catalysis Letters

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ER -

Isotopic study of nitrous oxide decomposition on an oxidized Rh catalyst: Mechanism of oxygen desorption

Abstract

Keywords

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