| Autor: |
Lian-ru, Zhang, Tian-ming, Yang, Guo-lin, Zou |
| Zdroj: |
Wuhan University Journal of Natural Sciences; Sep2000, Vol. 5 Issue 3, p357-360, 4p |
| Abstrakt: |
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: In A=0. 2468 E a −8. 0513. Ea is 206. 61 kJ/mol. The results show that porphyrin copper-sodium has a high activation energy and good stability. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink