Thermogravimetric and X-ray diffraction investigation on carbonated lanthanum oxide and lanthanum hydroxide formed in humid CO.sub.2 atmosphere

Lanthanum oxide compounds are of great interest because of their wide range of applications (e.g., heterogeneous catalysis). It is well known that lanthanum oxide compounds, like lanthanum oxide, have to be handled carefully in a humid atmosphere due to their hydration affinity. Furthermore, lanthan...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2018-10, Vol.134 (1), p.261
Main Authors: Haibel, Elena, Berendts, Stefan, Walter, Dirk
Format: Article
Language:English
Subjects:
Carbonates
Heterogeneous catalysis
Hydroxides
Lanthanum
Rare earth metal compounds
X-ray diffraction
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Summary:Lanthanum oxide compounds are of great interest because of their wide range of applications (e.g., heterogeneous catalysis). It is well known that lanthanum oxide compounds, like lanthanum oxide, have to be handled carefully in a humid atmosphere due to their hydration affinity. Furthermore, lanthanum hydroxide has a high CO.sub.2 affinity and partially forms basic carbonates. The amount of carbonate impurities that are formed in air remains nearly constant over a long time. To investigate the carbonation process in more detail, lanthanum hydroxide and lanthanum oxide were stored in a controlled humid CO.sub.2 atmosphere. The results of thermal analysis (TA) and X-ray diffraction (XRD) prove a transformation of lanthanum hydroxide as well as lanthanum oxide to lanthanum carbonate via lanthanum hydroxide carbonate.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-018-7256-1