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DOI: 10.1039/A706384I (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 413-417

Chemistry of sulfate chloride perhydrates. Part 1. — Thermal decomposition of 4Na2SO4·NaCl·2H2O2 and the formation of Na2SO4(III)

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Stephen D. Cosgrove and William Jones

Abstract

Thermal treatment of the perhydrate, 4Na2SO4NaCl2H2O2 , results in the evolution of H2O2 . Combined thermogravimetry (TG) and mass spectrometry (MS) confirms that at least a portion of the H2O2is released intact. TG, together with differential scanning calorimetry (DSC), suggests that the release of H2O2occurs in two stages. The isothermal decomposition of the perhydrate at 88 °C has been monitored by powder X-ray diffraction (PXRD), IR spectroscopy, available oxygen content (AVOX) and thermogravimetry. The resulting solid consists of an intimate mixture of Na2SO4(III) and NaCl. An explanation for the formation of this particular polymorphic form of Na2SO4 is proposed.

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