Influences of product gases on the kinetics of thermal decomposition of synthetic malachite evaluated by controlled rate evolved gas analysis coupled with thermogravimetry
✍ Scribed by Nobuyoshi Koga; Shuto Yamada
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 199 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
Abstract
An instrument of controlled rate evolved gas analysis (CREGA) coupled with TG‐DTA was constructed for analyzing the influences of product gases on the kinetics and mechanism of the thermal decomposition of solids that produce more than one gaseous products at the same stage of reaction. The thermal decomposition of synthetic malachite, Cu~2~(OH)~2~CO~3~, was subjected to the measurements of CREGA‐TG under controlled concentrations of H~2~O and CO~2~ in the reaction atmosphere with taking account of self‐generated H~2~O and CO~2~ during the course of reaction. By a series of CREGA‐TG measurements carried out under various atmospheric conditions, it was reconfirmed that the reaction is accelerated and decelerated by the effects of atmospheric H~2~O and CO~2~, respectively. From the kinetic analysis of the CREGA‐TG curves and results of high temperature X‐ray diffraction measurements under various reaction atmospheres, it was revealed that the anomalous effects of atmospheric H~2~O on the reactivity and on the reaction rate of the thermal decomposition of synthetic malachite appear at the early stage of the reaction. Usefulness of the CREGA‐TG technique for measuring the kinetic rate data for the thermal decomposition of solids was demonstrated in the present study, by emphasizing the importance of quantitative control of self‐generated reaction atmosphere. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: 346–354, 2005