Behaviour of hydrotalcite and its Fe(CN)(6)(4-) pillared derivative on heat treatment

Mg-Al L(ayered) D(ouble) H(ydroxide) was prepared and its thermal behaviour was characterized by thermoanalytical methods (TG, DTG, DTA), Al-27 M(agic ) A(ngle) S(pinning) NMR spectroscopy, X-ray diffractometry (XRD) and S(can ning) E(lectron) M(icroscopy). Heat treatment destroyed the layered structu re, which could only be partially reconstituted by rehydration. On calcinat ion mixed oxide with the predominance of basic sites were formed. Pillaring the LDH with Fe(CN)(6)(4-) anions was also performed. The material was cha racterized by XRD and BET measurements. Heat stability of the pillared subs tance was investigated, too. Pillaring proved to be successful, however, de creased heat resistance was found in the intercalated material relative to the guest LDH.