Temperature Dependent Electrical Properties and Catalytic Activities of La2O3–CO2–H2O Phase System

We present a study of electrical properties and catalytic activities of materials belonging to the hydrated carbonated system La2O3–CO2–H2O. The polycrystalline hydroxycarbonate, dioxycarbonate, and oxide are prepared via a coprecipitation route followed by heat treatment. The electrical conduction...

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Published inAdvances in materials science and engineering Vol. 2009; no. 2009; pp. 1 - 4
Main Authors Bakiz, Bahcine, Guinneton, Frédéric, Arab, Madjid, Villain, Sylvie, Benlhachemi, Abdeljalil, Gavarri, Jean Raymond
Format Journal Article
LanguageEnglish
Published Cairo, Egypt Hindawi Puplishing Corporation 01.01.2009
Hindawi Publishing Corporation
Wiley
Subjects
Catalysis
Chemical Sciences
Inorganic chemistry
Material chemistry
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Summary:We present a study of electrical properties and catalytic activities of materials belonging to the hydrated carbonated system La2O3–CO2–H2O. The polycrystalline hydroxycarbonate, dioxycarbonate, and oxide are prepared via a coprecipitation route followed by heat treatment. The electrical conduction of the phases obtained by thermal decomposition from LaOHCO3, H2O is analyzed by electrical impedance spectroscopy, from 25°C to 950°C, under air. The catalytic properties of LaOHCO3, La2O2CO3 and La2O3 polycrystalline phases are studied by FTIR spectroscopy, in presence of gas mixtures CO-air and CH4-air, at temperatures ranging between 100°C to 525°C. The three materials behave differently in presence of CO or CH4 gases.
ISSN:1687-8434
1687-8442
DOI:10.1155/2009/612130