Thermal decomposition kinetics of
antimony oxychloride in air
antimony oxychloride in air
(1.College of Chemistry and Chemical Engineering,
Central South University,Changsha 410083,China;
2.Department of Metallurgical Science and Engineering,
Central South University,Changsha 410083,China)
Central South University,Changsha 410083,China;
2.Department of Metallurgical Science and Engineering,
Central South University,Changsha 410083,China)
Abstract: The DTA and XRD techniques were employed to study thermal decomposition mechanism of antimony oxychloride SbOCl in the air. The thermal decomposition reaction occurs in four steps, and the former three steps as: SbOCl(s)→Sb4O5Cl2(s)+SbCl3(g)→Sb8O11Cl2(s)+SbCl3(g)→Sb2O3(s)+SbCl3(g). The forth step is the oxidation of Sb2O3 by air, Sb2O3(s)+O2→Sb2O4(s). The activation energy and the order of the thermal decomposition reaction of antimony oxychloride in three steps presented in DTA curves were calculated according to Kinssinger methods from DTA curves. The values of activation energy and t he order are respectively 91.97kJ/mol, 0.73 in the first step, 131.14kJ/mol, 0.63 in the second step and 146.94kJ/mol, 1.58 in the third step.
Key words: antimony oxychloride；thermal decomposition；kinetics