Evolution of the surface of haematite prepared by thermal decomposition of goethite: A microcalorimetric study

α-Fe 2O 3 samples have been prepared by thermal decomposition of crystalline α-FeOOH in air, and have been characterized by XRD and SEM analyses and surface area measurements. Three samples, decomposed at 673, 973 and 1373 K, respectively, have also been characterized by microcalorimetry following t...

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Bibliographic Details
Published in:Colloids and surfaces 1988, Vol.32 (1-2), p.75-85
Main Authors: Rossi, Pier Francesco, Caracciolo, Giovanna, Busca, Guido
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Membranes
Porous materials
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Summary:α-Fe 2O 3 samples have been prepared by thermal decomposition of crystalline α-FeOOH in air, and have been characterized by XRD and SEM analyses and surface area measurements. Three samples, decomposed at 673, 973 and 1373 K, respectively, have also been characterized by microcalorimetry following the adsorption at room temperature of water, n-butylamine and hexafluoroisopropanol. It has been concluded that the nature of the active surface sites of the haematite samples is not modified by thermal treatment; both rather strong acidic sites and moderately basic sites are retained. However, the local density is markedly changed, due to the poisoning effect of chemisorbed water present only on samples obtained by decomposition at the lower temperatures.
ISSN:0166-6622
1873-4340
DOI:10.1016/0166-6622(88)80005-2