A round-robin study of cellulose pyrolysis kinetics by thermogravimetry

Grønli, Morten and Antal, Michael J. and Várhegyi, Gábor (1999) A round-robin study of cellulose pyrolysis kinetics by thermogravimetry. INDUSTRIAL and ENGINEERING CHEMISTRY RESEARCH, 38. pp. 2238-2244. ISSN 0888-5885

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Abstract

Eight European laboratories with access to five different thermogravimetric analyzers participated in this round-robin study of Avicel PH-105 cellulose pyrolysis at 5 and 40 °C/min. Agreement between the laboratories on the temperature (Tpeak) associated with the maximum rate of weight loss at 5 °C/min was good. Less agreement was obtained on the residual char yield. At 40 °C/min, the scatter associated with measurements of Tpeak and the char yield increased. Good fits to each weight loss curve were obtained by use of a kinetic model based on an irreversible, first order reaction with a high (ca. 244 kJ/mol) apparent activation energy (E). Variations in values of E and the pre-exponential constant (A) are attributed to variations in thermal lag between the various instruments, and at different heating rates. Kinetic parameters are presented which offer a good fit to the 5 °C/min round-robin data, and which prescribe an envelope that contains the data. We recommend that future studies of biomass pyrolysis by thermogravimetry include an analysis of Avicel PH 105 cellulose at 5 °C/min, and a comparison of the resulting weight loss curve with the curves presented herein.

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