The thermal decomposition of aluminum sulfate in different gas phase environments

Effect of mechanical activation on structure and thermal decomposition of aluminum sulfate

“…For all samples, the total weight losses correspond to the theoretical stoichiometry: 70.2 wt.%, i.e. the decomposition process is completed with the formation of Al 2 O 3 [21]. The conversions of non-activated and main part of mechanically activated aluminum sulfates to alumina are also observed as minima in the DTG curves (Fig.…”

“…In order to completely convert aluminum sulfate to Al 2 O 3 and SO 3 , it is necessary to heat at temperatures higher than 1273 K [21]. However, a lower decomposition temperature can be applied by introduction of a reducing agent to the gaseous phase [22].…”

Mechanism and kinetics of inorganic sulphates decomposition

“…Many of the methods for identifying the thermallystable inorganic sulphates (CaSO 4 and BaSO4) [6,7] are related to the possibility of using various gaseous reducers; with A12(SO4) 3 and FeSO4.H20 the presence of H20 and 02 might change the direction of the process which results in obtaining various intermediate sulphates [2]. Those changes in the mechanisms of the thermal decomposition are not traditional and are defined by the test conditions, but most of all -by the content of the gaseous environment [8,9]. The production of intermediate sulphates by the thermal decomposition of A12(SO4)3 and FeSO4.H20 is described also by Lorant [12], Gallagher [13], etc.…”

“…One peculiar feature of the thermo-gravimetral dependences, explained also by some old studies [9], is the formation of the intermediate solid phase in the temperature interval 1025-1048 K. The decomposition products at 1178 K are ana- (Fig. 7).…”

Síntese Das Membranas Gama-Alumina E Zeolítica Mor/Gama-Alumina Pelo Método De Transporte Em Fase Vapor / Synthesis of the Gamma-Alumina and Zeolitic Membranes Mor/Gamma-Alumina by the Steam Phase Transport Method

“…A zeólita Mordenita foi sintetizada hidrotermicamente de acordo com a metodologia proposta por Kim e Ahn (38) . A composição da mistura reacional foi: 6Na2O De acordo com os dados relatados (40,41) , a decomposição do sulfato de alumínio hidratado Al2(SO4)318H2O consiste de quatro etapas principais que são formadas por subetapas. As etapas de desidratação iniciam na faixa de temperatura de 27°C à aproximadamente 700°C e a etapa de decomposição do sulfato se inicia em 700ºC.…”