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dc.contributor.authorKostura, Bruno
dc.contributor.authorKovanda, František
dc.contributor.authorValášková, Marta
dc.contributor.authorLeško, Juraj
dc.identifier.citationCollection of Czechoslovak chemical communications. 2007, vol. 72, issue 9, p. 1284-1294.en
dc.publisherAkademie věd České republiky, Ústav organické chemie a biochemieen
dc.relation.ispartofseriesCollection of Czechoslovak chemical communicationsen
dc.subjectlayered double hydroxideen
dc.subjectX-ray powder diffractionen
dc.subjectrehydration-reconstruction processen
dc.titleRehydration of calcined Mg-Al hydrotalcite in acidified chloride-containing aqueous solutionen
dc.identifier.locationVe fondu ÚKen
dc.description.abstract-enThe rehydration of periclase-like Mg-Al mixed oxide obtained by calcination of hydrotalcite- like precursor with a Mg/Al molar ratio of 2 was carried out in KCl-HCl solutions at various pH and constant concentration of Cl-. A buffer equilibrium accompanied by leaching out of Mg2+ cations from the solid was observed during rehydration, when reconstruction of the layered hydrotalcite structure takes place. With increasing HCl concentration in the rehydration solution, the Mg/Al molar ratio in the obtained solid gradually decreased from about 1.5 to 0.3. An anomaly was found, when the increasing concentration of acid resulted in increasing pH of final solution. The XRD measurements showed that the initially formed hydroxide form of hydrotalcite is transformed into randomly interstratified forms of the Mg-Al hydroxide hydrate/Mg-Al chloride hydroxide hydrate, which are accompanied by the release of OH- anions into solution. The crystalline structure of rehydrated product decreased as Mg2+ cations were released into solution, which was accompanied by incorporation of Cl- into the solid.en

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