Kinetic Analysis of Thermogravimetric Data Computer Program TGA2,
Abstract
Zsako has modified a curve fitting method reported by Doyle and in this report the method is further simplified to allow the use of a digital computer. The best description of the thermogram step ws found to be given by 19 equally spaced co-ordinates between the (1 - alpha) limits of 0.05 to 0.95. These co-ordinates, together with the heating rate, are used to calculate E and log Z, by an iterative process which minimises the standard deviation of the log g(alpha) - log p(x) values. The standard deviation allows a comparative assessment of the validity of the kinetic equations chosen to represent the mechanism of the reaction. A further simplification involved the use of an approximate equation for - log p(x) in place of tabulated values. The TGA2 method of calculation was shown to be valid by re-calculating E and log Z for standard curves which were generated from tables of - log p(x). Published data by Doyle and Zsako were re-calculated and the answers were in good agreement with the original results. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1979
- Accession Number
- ADA068736
Entities
People
- H. Briscall
Organizations
- Atomic Weapons Establishment