18O-isotope exchange behaviour and oxidation activity of La1-xSrxMnO3+δ

I. K. Murwani; S. Scheurell; M. Feist; E. Kemnitz

doi:10.1023/A:1019905819824

¹⁸O-isotope exchange behaviour and oxidation activity of La_1-xSr_xMnO_3+δ

I. K. Murwani^*, S. Scheurell, M. Feist, E. Kemnitz

^*Corresponding author for this work

Humboldt University of Berlin

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

13 Citations (Scopus)

Abstract

Different preparation routes derived both from the usual high-temperature solid state synthesis and the sol-gel process were applied for the synthesis of crystalline La_1-xSr_xMnO_3+δ phases with 0 ≤ x ≤ 0.2. They were investigated by means of temperature programmed isotope exchange (TPIE) under various conditions. The ¹⁸O isotope exchange experiments yielded information on the dependence of the oxygen mobility on temperature and the Mn⁴⁺/Mn³⁺ ratio. Both are related to the defect structure of the solid. TPIE was applied for studying the interaction between ¹⁸O₂ and CH₄ under static conditions and was compared with results obtained from catalytic investigations, i.e. the behaviour of La_1-xSr_xMnO_3+δ (0 ≤ x ≤ 0.2) in both CO and CH₄ oxidation with normal oxygen ¹⁶O₂ under steady flow conditions.

Original language	English
Pages (from-to)	9-21
Number of pages	13
Journal	Journal of Thermal Analysis and Calorimetry
Volume	69
Issue number	1
DOIs	https://doi.org/10.1023/A:1019905819824
Publication status	Published - 2002
Externally published	Yes

Keywords

CO oxidation
Catalytic activity
Methane oxidation
O isotope exchange
Ternary manganites

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10.1023/A:1019905819824

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title = "18O-isotope exchange behaviour and oxidation activity of La1-xSrxMnO3+δ",

abstract = "Different preparation routes derived both from the usual high-temperature solid state synthesis and the sol-gel process were applied for the synthesis of crystalline La1-xSrxMnO3+δ phases with 0 ≤ x ≤ 0.2. They were investigated by means of temperature programmed isotope exchange (TPIE) under various conditions. The 18O isotope exchange experiments yielded information on the dependence of the oxygen mobility on temperature and the Mn4+/Mn3+ ratio. Both are related to the defect structure of the solid. TPIE was applied for studying the interaction between 18O2 and CH4 under static conditions and was compared with results obtained from catalytic investigations, i.e. the behaviour of La1-xSrxMnO3+δ (0 ≤ x ≤ 0.2) in both CO and CH4 oxidation with normal oxygen 16O2 under steady flow conditions.",

keywords = "CO oxidation, Catalytic activity, Methane oxidation, O isotope exchange, Ternary manganites",

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T1 - 18O-isotope exchange behaviour and oxidation activity of La1-xSrxMnO3+δ

AU - Murwani, I. K.

AU - Scheurell, S.

AU - Feist, M.

AU - Kemnitz, E.

PY - 2002

Y1 - 2002

N2 - Different preparation routes derived both from the usual high-temperature solid state synthesis and the sol-gel process were applied for the synthesis of crystalline La1-xSrxMnO3+δ phases with 0 ≤ x ≤ 0.2. They were investigated by means of temperature programmed isotope exchange (TPIE) under various conditions. The 18O isotope exchange experiments yielded information on the dependence of the oxygen mobility on temperature and the Mn4+/Mn3+ ratio. Both are related to the defect structure of the solid. TPIE was applied for studying the interaction between 18O2 and CH4 under static conditions and was compared with results obtained from catalytic investigations, i.e. the behaviour of La1-xSrxMnO3+δ (0 ≤ x ≤ 0.2) in both CO and CH4 oxidation with normal oxygen 16O2 under steady flow conditions.

AB - Different preparation routes derived both from the usual high-temperature solid state synthesis and the sol-gel process were applied for the synthesis of crystalline La1-xSrxMnO3+δ phases with 0 ≤ x ≤ 0.2. They were investigated by means of temperature programmed isotope exchange (TPIE) under various conditions. The 18O isotope exchange experiments yielded information on the dependence of the oxygen mobility on temperature and the Mn4+/Mn3+ ratio. Both are related to the defect structure of the solid. TPIE was applied for studying the interaction between 18O2 and CH4 under static conditions and was compared with results obtained from catalytic investigations, i.e. the behaviour of La1-xSrxMnO3+δ (0 ≤ x ≤ 0.2) in both CO and CH4 oxidation with normal oxygen 16O2 under steady flow conditions.

KW - CO oxidation

KW - Catalytic activity

KW - Methane oxidation

KW - O isotope exchange

KW - Ternary manganites

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JF - Journal of Thermal Analysis and Calorimetry

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¹⁸O-isotope exchange behaviour and oxidation activity of La_1-xSr_xMnO_3+δ

Abstract

Keywords

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