Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Catalytic behaviours and electrical conduction changes in BaCeO3 ceramics synthesized by sol-gel method

nr katalogowy: 52726

BaCeO3 (BCO) ceramics and related perovskite type compounds were intensively studied because of their high temperature potential applications (e.g. for fuel cell and electrocatalysis technologies) [1÷3]. They were regarded as very promising candidates as solid electrolytes in electrochemical devices such as solid oxide fuel cells (SOFCs) and gas sensors [4÷6]. These perovskite type structures were highly interesting mainly because of their high ionic conductivity. More recently, we found that BaCeO3 exhibited heterogeneous photocatalytic activities for water splitting [7÷10]. Doped barium cerate materials were also investigated as proton conductors in humidified reducing atmosphere at intermediate temperature: these perovskite type materials were also considered as promising electrolytes for SOFCs [11÷14]. The microstructure and the presence of carbon dioxide in the ambient atmosphere were also considered as potential parameters that could condition the conductivity mechanisms [15]. These oxide materials were also found to present high interest as catalysts for oxidation reaction because of their high capacity of oxygen conduction. Recently solid gas interaction analyses between BCO and methane CH4 in air-CH4 flows were published [16, 17]. However, in our knowledge, the solid gas interactions between BaCeO3 and carbon monoxide CO were never studied. In this work, we first study the conversion of CO in air-CO gas mixtures interacting with barium cerate powder, and then we determine the high temperature electrical conductivity of compacted pellets of barium cerate. We report a new synthesis method allowing preparing BaCeO3 perovskite ceramics at moderate temperature (1100°C). Characterizations are achieved using X-ray diffraction and transmission electron microscopy. The catalytic properties are investigated from analyses of emitted gases from Fourier Transform infrared spectroscopy (FTIR). The electrical properties are studied[...]

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2010-3

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