Application of thermogravimetry to study the kinetics and stability of porphyrin copper-sodium of ephedra期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Application of thermogravimetry to study the kinetics and stability of porphyrin copper-sodium of ephedra

Authors:	Zhang Lian-ru Yang Tian-ming Zou Guo-lin

Institution:	(1) College of Life Sciences, Wuhan University, 430072 Wuhan, China

Abstract:	Thermogravimetry was used to study the non-isothermal decomposition kinetics and the stability of porphyrin copper-sodium from ephedra. The kinetic equation for the second step can be expressed as $d\alpha /(dT) = Ae^{ - \frac{{E_\alpha }}{{KT}}} 3/2(1 - \alpha )^{4/3} /(1 - \alpha )^{ - 1/3} - 1]$ . The kinetic compensation effect is found to be: InA=0. 2468E _a −8. 0513.Ea is 206. 61 kJ/mol. The results show that porphyrin copper-sodium has a high activation energy and good stability. Biography: Zhang Lian-ru(1964), female, lecturer Research direction, applied biochemistry.

Keywords:	porphyrin copper-sodium TG-DTG activation energy non-isothermal kinetics
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