Kinetics of the Pyrolysis of Cellulose over the Temperature Range 250°C - 300°C

摘要

Alpha cellulose samples, containing between 0.11 and 0.14％ ash, were subjected to isothermal pyrolysis in a fluidized bath in a nitrogen environment at temperatures ranging from 250 to 298℃. Results were reported in terms of volatilization (based on weight loss measurements), and decomposition (in term of glucosan loss). The findings indicate that there are essentially three distinct chronological stages of pyrolysis:n1. An initial rapid decomposition and weight loss periodn2. A range in which both the volatilization and the decomposition obey an apparent zero order expressionn3. A region in which the volatilization follows a first order rate;leaving a char deposit which does not undergo further pyrolysis .nA single activation energy of 42 kcal/mole escribes both the decomposition and volatilization rates over the entire 250° to 298℃ range.