醋酸银热分解

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Radiation Effects & Defects in Solids Vol. 164, No. 3, March 2009, 170–177
γ-Irradiation effects on the kinetics and mechanism of the thermal decomposition of silver acetate
γ-Irradiation effects on the kinetics and mechanism of the thermal decomposition of silver acetate
R. M. Mahfouz a , A. Bumajdad b & F. A. Al-Sagheer b a Department of Chemistry , College of Science, King Saud University , Riyadh, Saudi Arabia b Department of Chemistry , College of Science, Kuwait University , Kuwait Published online: 16 Mar 2009.
Keywords: silver acetate; thermal decomposition; irradiation; kinetic studies
1. Introduction
Thermal decomposition of solids is an important field of solid-state chemistry with wide technical application (1). Pre-exposure to ionizing radiation (γ -ray or UV light) was found to accelerate the thermal decomposition of solids. However, details of the kinetics were not reported (2). Previous work on the thermal decomposition of metal acetates indicated that the isothermal decomposition kinetics could be affected markedly by prior exposure to ionizing radiation (3–5). In general, the effects with increasing dose are a shortening of the induction period followed by an overall decrease in the time required to complete the reaction (6). Metal acetates represent an important class of the compounds with wide technical and biological applications. Silver acetate has a wide application as a catalyst. It is used for manufacturing PTA (purified terephthalic acid), DMT (dimethyl terephthalate) and PSF (polyester staple fibers). Silver acetate as a catalyst has been applied for vinylacetate synthesis (7) and di- and tri-imide formation from 1,8-naphthalic anhydride and aromatic polyamides (8). Further applications of silver acetate as a catalyst have been in ceramic and wood preservative industries.
R.M. Mahfouza*, A. Bumajdadb and F.A. Al-Sagheerb
aDepartment of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia; bDepartment of Chemistry, College of Science, Kuwait University, Kuwait
To cite this article: R. M. Mahfouz , A. Bumajdad & F. A. Al-Sagheer (2009) γ-Irradiation effects on the kinetics and mechanism of the thermal decomposition of silver acetate, Radiation Effects and Defects in Solids: Incorporating Plasma Science and Plasma Technology, 164:3, 170-177, DOI: 10.1080/10420150802655716
(Received 9 June 2008; final version received 26 November 2008 )
The kinetics of the thermal decomposition of un-irradiated (pristine) and pre-γ -irradiated anhydrous silver acetate was studied in the temperature range (298–773 K) and in air using isothermal and dynamic thermogravimetric techniques. The data were analyzed using various solid-state reaction models. An integral method using the Coats–Redfern equation was applied in dynamic data analysis. The results showed that the kinetics of isothermal decomposition for the acceleratory stage was governed by a diffusion-controlled process while in non-isothermal (dynamic) decomposition the kinetics were controlled by a nucleation process. The activation energies of the main decomposition process for un-irradiated and pre-γ -irradiated samples were calculated and the results of the isothermal and dynamic integral methods were compared and discussed. The changes in texture and crystal structure of the investigated silver acetate by γ -irradiation were studied using electron microscopy and X-ray diffraction techniques.
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Radiation Effects and Defects in Solids: Incorporating Plasma Science and Plasma Technology
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