Resumo

CARRIAZO, José; MOLINA, Rafael  e  MORENO, Sonia. THERMAL AND SPECTROSCOPIC CHARACTERIZATION OF CLAYS PILLARED WITH Al, Ce, Fe POLYHYDROXOCATIONIC SOLUTIONS. Rev.Colomb.Quim. [online]. 2008, vol.37, n.2, pp.189-202. ISSN 0120-2804.

This work shows the characterization by IR spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA) and nuclear magnetic resonance spectroscopy (29SiNMRand 27Al NMR) of a set of pillared clays synthesized with Al, Al-Fe, Al-Ce or Al-Ce-Fe polyhydroxocationic solutions. TGADTA analyses indicate a favorable thermal effect (higher thermal stability) when Ce, Fe or Ce-Fe are added. IR and 29Si NMR results reveal a probable formation of a bond between the alumina pillar and the clay (SiO4)-tetrahedral sheet, whereas the 27Al NMR does not evidence any isomorphous substitution of iron or cerium in the alumina pillars. Moreover, by IR spectroscopy was not observed any structural difference between solids pillared with Al and those pillared with Al-Ce, showing that cerium is possibly incorporated in an independent way to the alumina pillar.

Palavras-chave : pillared clay; pillared bentonite; characterization of pillared clays.

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