Rehydration of calcined Mg-Al hydrotalcite in acidified chloride-containing aqueous solution

Kostura, Bruno; Kovanda, František; Valášková, Marta; Leško, Juraj

dc.contributor.author	Kostura, Bruno
dc.contributor.author	Kovanda, František
dc.contributor.author	Valášková, Marta
dc.contributor.author	Leško, Juraj
dc.date.accessioned	2007-10-26T10:45:21Z
dc.date.available	2007-10-26T10:45:21Z
dc.date.issued	2007
dc.identifier.citation	Collection of Czechoslovak Chemical Communications. 2007, vol. 72, issue 9, p. 1284-1294.	en
dc.identifier.issn	0010-0765
dc.identifier.issn	1212-6950
dc.identifier.uri	http://hdl.handle.net/10084/63962
dc.language.iso	en	en
dc.publisher	Akademie věd České republiky, Ústav organické chemie a biochemie	en
dc.relation.ispartofseries	Collection of Czechoslovak Chemical Communications	en
dc.relation.uri	https://doi.org/10.1135/cccc20071284	en
dc.subject	hydrotalcite	en
dc.subject	layered double hydroxide	en
dc.subject	magnesium	en
dc.subject	aluminum	en
dc.subject	X-ray powder diffraction	en
dc.subject	rehydration-reconstruction process	en
dc.title	Rehydration of calcined Mg-Al hydrotalcite in acidified chloride-containing aqueous solution	en
dc.type	article	en
dc.identifier.location	Ve fondu ÚK	en
dc.description.abstract-en	The 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
dc.identifier.doi	10.1135/cccc20071284
dc.identifier.wos	000249736900010

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