Mechanism for decomposition of aurichalcite -: A controlled rate thermal analysis study

Controlled rate thermal analysis (CRTA) of a series of synthetic aurichalcite (Zn,Cu2+)(5)(CO3)(2)(OH)(6) with the ratio of Cu/Zn varying from 0.1 to 0.5 proves that the dehydroxylation and carbonate loss occur as non-isothermal and isothermal decompositions. The temperature of the thermal decomposition increases as the Cu/Zn ratio increases. Thermal decomposition of aurichalcite provides a method for preparing mixed oxide catalysts at the molecular level as opposed to the particle level. CRTA technology enables separation of the processes of dehydration, dehydroxylation and decarbonation. X-ray diffraction of the products of the thermal decomposition proved to be a mixture of the oxides ZnO and Cu2O. (c) 2007 Elsevier B.V. All rights reserved.