應用E2特殊函數求取碳酸氫鈉之熱裂動力學參數

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Title:	應用E2特殊函數求取碳酸氫鈉之熱裂動力學參數
Other Titles:	Applying E2-Function for the Studies of Pyrolysis Kinetics
Authors:	陳錫仁;賴冠名;林月琴
Contributors:	淡江大學化學工程學系
Keywords:	熱裂解動力學;非等溫熱重量法;阿瑞尼亞方程式;合成熱重變化圖;pyrolysis kinetics;thermal gravimetric analysis(TGA);Arrhenius equation;synthetic thermogram
Date:	2002-06-20
Issue Date:	2014-02-09 00:46:54 (UTC+8)
Abstract:	非恆溫熱重量法(Nonisothemal TGA)可說是熱分析法最受重視的方法，非恆溫熱重量法通常採取樣本直線加溫的方式，由「溫度積分」的近似式求得熱裂解動力學之參數，如反應之活化能、頻率因子及反應冪次。積分法中的「溫度積分」近似式，一般認為是方便、可靠的方法，且比起微分法或級數展開的近似法要來得正確。因此，有相當多的研究者投入「溫度積分」近似式的改善，本研究提出一個新的方法，即應用由正確解得到的特殊函數E/sub 2/，從非恆溫熱重分析數據中，求得碳酸氫鈉熱裂的動力學參數。利用本研究提出之新方法，我們求得碳酸氫鈉熱裂的反應幕次範圍在0.9-1.1間，我們觀察反應冪次為0.95時最符合我們的動力學模式，其活化能為84kJ/mole。若反應冪次為1時，我們求得活化能為90kJ/mole。本研究所得之結果與文獻比較，其結果稍微低於文獻，但我們相信此法較為精確與便捷。 In the past few decades, thermal analysis (TA) has widely to be used in pyrolysis kinetics research. A new method, which uses exact formula involving the E2-function, is proposed for kinetic parameters from thermogravimetry. This method is applied to that of sodium hydrogen carbonate (NaHCO3) and copper (II) sulfate pentahydrate (CuSO4 · 5H2O) from nonisothermal thermogravimetry analysis (TGA) data. There is only one pyrolyzed stage for the decomposition of sodium carbonate. The possible domain of reaction orders ranges from 0.9 to 0.95, it was observed that the activation energy was found to be 76-83 kJ/mol. There are three consecutive pyrolyzed stages for the decomposition of copper (II) sulfate pentahydrate. The first stage of the reaction was water splitting, but the dehydration steps seem to be affected by the heating rate. We neglect this part in this paper. The second stage of the decomposition produces sulfur dioxide and oxygen; its reaction order ranging from 1.5 to 1.8 and the activation energy was found 228-277 kJ/mol. The third stage of the oxygen splitting decomposition, reaction order ranging from 0.2 to 0.4 and the activation energy was found 195-234 kJ/mol.
Relation:	第二十屆台灣區觸媒及反應工程研討會論文集
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Proceeding

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