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

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Show simple item record Kostura, Bruno Kovanda, František Valášková, Marta Leško, Juraj 2007-10-26T10:45:21Z 2007-10-26T10:45:21Z 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.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 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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