Thermal decomposition of organic derivatives of crystalline zirconium phosphate-phosphite

Abstract

Organic derivatives of crystalline zirconium phosphate-phosphite (ZrPP) are easily obtained by direct contact of the given organic solution with the crystalline material. The thermal decomposition of benzyl alcohol, benzylamine and some other aromatic compounds intercalated in ZrPP was examined. All examined samples lose their crystal water first at a relatively low temperature. The structural water is lost at a relatively higher temperature (in comparison with the crystalline a-zirconium phosphate derivatives).The zirconium phosphate-phosphite (ZrPP) ion-exchanger was first investigated by Alberti and coworkers [1, 2], and we investigated the effects of modification of the preparation method and the mode of preparation of organic derivatives of this material [3,4]. The double-layered ZrPP is a good intercalating agent for organic molecules containing COOH and/or NH2 groups.As part of this work, the thermal stability and thermal decomposition of organic derivatives were studied, and the results of these investigations are presented in this paper. Experimental PreparationsPreparations were carried out as follows: in each case, 100 ml of a saturated solution of the organic molecule added dropwise to 1.0 g of zirconium phosphate-phosphite (ZrPP). The ZrPP was equilibrated with this solution for five days at room temperature.

Thermal decomposition of organic derivatives of crystalline zirconium phosphate

“…The n-alkylamine derivatives were identified by analytical, X-ray powder diffraction and IR spectrophotometric methods under the conditions described earlier [3], while the thermal behaviour of the samples was investigated by means of differential thermal analysis as reported previously [4]. The IR spectra are shown in Fig.…”