What are the kinetic parameters for the decomposition of Klason lignin isolated from beech wood?

Label:chem

Topic
The study developed a three-step kinetic model to describe the decomposition of Klason lignin isolated from beech wood. The model includes activation energies, pre-exponential factors, reaction orders, and fractions of volatile products released from each step.
Answer
The kinetic parameters for the decomposition of Klason lignin isolated from beech wood are as follows:
First Step: Activation energy (E1) = 60.9 kJ/mol, Pre-exponential factor (A1) = 5.8 × 10^4 s^-1, Reaction order (n1) = 3.0, Fraction of volatile products (ν1) = 0.16
Second Step: Activation energy (E2) = 147.4 kJ/mol, Pre-exponential factor (A2) = 8.2 × 10^10 s^-1, Reaction order (n2) = 3.4, Fraction of volatile products (ν2) = 0.26
Third Step: Activation energy (E3) = 112.9 kJ/mol, Pre-exponential factor (A3) = 3.2 × 10^5 s^-1, Reaction order (n3) = 2.0, Fraction of volatile products (ν3) = 0.074
These parameters accurately describe the thermogravimetric behavior of beech wood Klason lignin over a wide temperature range, with deviations between measured and simulated curves being very low (devTG = 0.9%, devDTG = 2.8%).
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