Zusammenfassung
The exothermic reactions of thermally unstable materials have been
studied using self-heating methods in a wire-mesh-reactor as well
as temperature-programmed methods utilizing a differential scanning
calorimeter (DSC). Samples of lignite coal dust, cork dust, detergent
powder and riboflavin (vitamin B2) were investigated. The overall
activation energy E could be determined for each method. For lignite
coal and cork dust all techniques show very nice agreement in E.
For the detergent powder, the values are comparable except for the
heat-release (HR) rate method value which is about 50-60 kJ/mol higher.
Riboflavin on the other hand shows a different behaviour. The DSC-experiments
lead to values being significantly higher compared to the self-heating
values. The existing differences are clearly worked out.
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