Thermal evolution of a sample of La2O3 exposed to the atmosphere

Thermal evolution of a sample of La2O3 exposed to the atmosphere. Bernal, S., Botana, F., García, R., & Rodríguez-Izquierdo, J. Thermochimica Acta, 66(1-3):139-145, 1993. cited By 56

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Because the basic character of La2O3 carbonation and hydration of this oxide may strongly modify its catalytic behaviour, a study of the regeneration conditions of a sample of La2O3 exposed to atmospheric H2O and CO2 for a long period of time have been carried out. TG-DTA data have shown that the thermal decomposition of La2O3 in a flow of helium takes place in three well-defined steps: evolution of water in the first two steps, and CO2 in the third could be observed by TPD. Stoichiometric calculations as well as IR spectroscopy and X-ray diffraction data corresponding to the initial sample and each of the phases formed after the three steps reported previously, suggest that exposure of lanthanum oxide to the air results in the formation of the hydroxide and an amorphous hydroxycarbonate phase. The regeneration of the hexagonal phase of La2O3 occurs above 1020 K, after the third step, which seems to correspond to the decomposition of a dioxomonocarbonate phase. © 1983.

@ARTICLE{Bernal1993139,
author={Bernal, S. and Botana, F.J. and García, R. and Rodríguez-Izquierdo, J.M.},
title={Thermal evolution of a sample of La2O3 exposed to the atmosphere},
journal={Thermochimica Acta},
year={1993},
volume={66},
number={1-3},
pages={139-145},
doi={10.1016/0040-6031(93)85026-6},
note={cited By 56},
url={https://www.scopus.com/inward/record.url?eid=2-s2.0-43949165920&partnerID=40&md5=ede4264f8b169785c308488684eff9ca},
affiliation={Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Puerto Real, Cádiz, Spain},
abstract={Because the basic character of La2O3 carbonation and hydration of this oxide may strongly modify its catalytic behaviour, a study of the regeneration conditions of a sample of La2O3 exposed to atmospheric H2O and CO2 for a long period of time have been carried out. TG-DTA data have shown that the thermal decomposition of La2O3 in a flow of helium takes place in three well-defined steps: evolution of water in the first two steps, and CO2 in the third could be observed by TPD. Stoichiometric calculations as well as IR spectroscopy and X-ray diffraction data corresponding to the initial sample and each of the phases formed after the three steps reported previously, suggest that exposure of lanthanum oxide to the air results in the formation of the hydroxide and an amorphous hydroxycarbonate phase. The regeneration of the hexagonal phase of La2O3 occurs above 1020 K, after the third step, which seems to correspond to the decomposition of a dioxomonocarbonate phase. © 1983.},
document_type={Article},
source={Scopus},
}

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