Cellulose pyrolysis kinetics: Revisited
- Univ. of Hawaii, Honolulu, HI (United States)
- Hungarian Academy of Sciences, Budapest (Hungary). Research Lab. for Materials and Environmental Chemistry
In the same thermogravimetric analyzer (TGA) under identical conditions, samples of pure, ash-free cellulose (i.e., Avicel PH-105, Whatman CF-11, Millipore ash-free filter pulp, and Whatman No. 42) obtained from different manufacturers undergo pyrolysis at temperatures which differ by as much as 30 C. Thus, the pyrolysis chemistry of a sample of pure cellulose is not governed by a universal rate law, as is the case with a pure hydrocarbon gas (for example). Nevertheless, the pyrolytic weight loss of all the samples studied in this work is well represented by a high activation energy (228 kJ/mol), first-order rate law at both low and high heating rates. These results do not corroborate the recent findings of Milosavljevic and Suuberg. For a particular cellulose sample (for example, Avicel PH-105), variations in the preexponential constant determined at different heating rates reflect uncontrolled, systematic errors in the dynamic sample temperature measurement (thermal lag).
- OSTI ID:
- 624319
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 37, Issue 4; Other Information: PBD: Apr 1998
- Country of Publication:
- United States
- Language:
- English
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