Temperature Dependent Electrical Properties and Catalytic Activities of La2O3–CO2–H2O Phase System. (28th December 2009)

• Record Type: Journal Article
• Authors: Bakiz, Bahcine; Guinneton, Frédéric; Arab, Madjid; Villain, Sylvie; Benlhachemi, Abdeljalil; Gavarri, Jean Raymond
• Other Names: Suib Steven Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2009(2009)
• Publication Date: 2009-12-28
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2009/612130
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : We present a study of electrical properties and catalytic activities of materials belonging to the hydrated carbonated systemLa 2 O 3 – CO 2 – H 2 O . 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 fromLaOHCO 3, H 2 O is analyzed by electrical impedance spectroscopy, from25 ° C to950 ° C, under air. The catalytic properties ofLaOHCO 3, La 2 O 2 CO 3 andLa 2 O 3 polycrystalline phases are studied by FTIR spectroscopy, in presence of gas mixtures CO-air andCH 4 -air, at temperatures ranging between100 ° C to525 ° C . The three materials behave differently in presence of CO orCH 4 gases.