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Kinetic rates of cellulose pyrolysis in nitrogen and steam [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 1977.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 14 : digital, PDF file
Additional Creators:
Princeton University, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Thermogravimetric analysis has been used to measure the rates of weight loss for cellulose prolysis in nitrogen and steam at nominal heating rates of 2/sup 0/, 5/sup 0/, 10/sup 0/, 20/sup 0/, 50/sup 0/, and 100/sup 0/C/min. The apparent activation energy, frequency factor, and order for each heating rate were determined by the method of Freeman and Carroll, and the variation in activation energy as a function of conversion was determined by the method of Friedman. Due to the poor heat transfer characteristics of the TGA, temperature gradients as large as 20/sup 0/ to 25/sup 0/C were observed to exist in the vicinity of the sample at a heating rate of 20/sup 0/C/min. Consequently, within the accuracy of the experiment we were unable to detect any difference in the results of cellulose pyrolysis in nitrogen and steam. We believe that the wide range of activation energies for cellulose pyrolysis reported by previous workers reflects the apparent difficulty in measuring the temperature of the cellulose during pyrolysis due to inadequate heat transfer. Future research should give adequate attention to the problems of heat transfer associated with chemical kinetic measurements.
Report Numbers:
E 1.99:conf-771149--5
conf-771149--5
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Note:
Published through SciTech Connect.
11/01/1977.
"conf-771149--5"
Combustion Institute Eastern State meeting, Hartford, CT, USA, 10 Nov 1977.
Antal, Jr., M. J.; Friedman, H. L.; Rogers, F. E.
Funding Information:
ET-78-F-02-5058
View MARC record | catkey: 13819807