Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Electrical studies of phase stabilities in the Ce2O(CO3)2·H2O/CeO2 and LaOHCO3/La2O3 systems

nr katalogowy: 52796

To develop new selective sensing devices for gas detection, working in environmental conditions, we are investigating materials susceptible to interact successively with H2O (vapor), CO2 gas and finally with a specific gas such as methane CH4, carbon monoxide CO. One possible solution for improving the selectivity should be to use oxide phases highly sensitive to carbonatation or hydration, presenting successive phases stable at increasing temperatures [1÷6]. Two systems are presently investigated to determine their relative reactivities with CO2 and H2O: the La2O3-H2O-CO2 and CeO2-H2OCO 2 rare earth based systems. The lanthanum based system presents a series of phases LaOHCO3, La2O2CO3 and La2O3 stable in three different temperature ranges [7÷15]. It also presents a high interest because of the strong capacity of hydration of the oxide phase La2O3. In addition, we have recently shown that these La2O3, LaOHCO3 and La2O2CO3 phases might present interesting catalytic activities, in presence of methane-air (CH4-air) and carbon monoxide-air (COair) flows at various temperatures [16]. The cerium system seems to behave differently with one stable Ce2O(CO3)2·H2O phase (with 3+ valence for cerium ion) and the CeO2 oxide (ceria) stable under air with 4+ valence for cerium ion [17, 18]. In the present study, we focus our attention on the decarbonatation kinetics of the carbonate phases and on the carbonatation kinetics of the oxide phases: the main objective of these analyses should be to determine their electrical sensitivities during gas solid interactions with CO2. These correlations between phase changes and electrical responses are not known, and they could deliver interesting informations to develop miniaturized electrical devices including microsensor or microabsorber systems. Exp erim ental detail s Elaboration The initial samples were first synthesized following the same approach. A first step consisted in preparing two c[...]

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