Thermal Decomposition Kinetics of Biomass Materials

Thermal decomposition kinetics of biomass materials encompasses the study of chemical and physical processes through which natural organic matter—chiefly cellulose, hemicellulose and lignin—breaks down under heat. This field probes the rates and pathways of pyrolysis, char formation and subsequent oxidation, yielding vital parameters such as activation energies and reaction orders. Understanding these kinetics is essential for optimising bioenergy production, improving fire safety of timber structures and modelling wildfire behaviour. Experimental techniques range from thermogravimetric analysis to cone calorimetry, often paired with inverse modelling or mechanistic models across scales from milligram samples to full-scale assemblies. Advances in kinetic modelling have shown that while the fundamental reaction schemes of the main biomass constituents remain broadly consistent across species, coupling between chemistry and heat transfer can significantly influence observed mass loss rates, char depth and thermal feedback. These insights underpin more accurate predictions of fuel conversion in reactors, inform sustainable design of engineered wood and aid in risk assessment for biomass-fuelled fires and wildland blazes.

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Thermal Decomposition Kinetics of Biomass Materials publication trend

The graph below shows the total number of articles in thermal decomposition kinetics of biomass materials across all publications each year (not limited to Nature Index journals).

Technical terms

Pyrolysis: Thermal decomposition of organic material in the absence of oxygen, producing volatile compounds and solid char.

Activation energy: The minimum energy barrier that reactant molecules must overcome to transform into products.

Char oxidation: The exothermic reaction of carbonaceous residue with oxygen, releasing heat and additional mass loss.

Damköhler number: A dimensionless ratio comparing the rate of chemical reaction to the rate of transport processes such as diffusion or convection.

Inverse modelling: A computational approach that derives kinetic parameters by fitting model predictions to experimental data through optimisation techniques.

References

1. The effect of chemical composition on the charring of wood across scales. Proceedings of the Combustion Institute (2019).
2. A multiscale model of wood pyrolysis in fire to study the roles of chemistry and heat transfer at the mesoscale. Combustion and Flame (2020).
3. Quantifying the heat release from char oxidation in timber. Fire Safety Journal (2023).