A temperature dependent pre-exponential factor for kinetic equations
Conference
·
OSTI ID:126160
- Colorado School of Mines, Golden, CO (United States)
During the course of preparation of an Atlas of Thermal Data on Biomass and other fuels we had occasion to measure the decomposition of a large number of materials under a variety of conditions. We measured the decomposition of cellulose, CaCO{sub 3} and several plastics at constant heating rates of 0.1, 1.0, 10, and 100{degrees}C/min. We found that it was not possible to use a single exponential and pre-exponential factor to predict the data over this wide range. We found that we could fit the data much better by including a temperature dependent term in the pre-exponential factor. This can also be justified on the basis of the original derivation by Arrhenius. It has previously been overlooked because decomposition is not usually measured over such a wide range. The new equation can be used to predict the thermal behavior of all the materials we tested over a much wider range of heating rates than the conventional Arrhenius equation.
- OSTI ID:
- 126160
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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