Pyrolysis Processes in Biomass Conversion

Pyrolysis is the thermal decomposition of organic materials in the absence of oxygen, a process central to converting biomass into useful fuels and chemicals. Depending on temperature and heating rate, pyrolysis may be categorised as slow, intermediate or fast, each yielding different proportions of solid char, liquid bio-oil and gaseous products. Control of reactor design, feedstock composition and residence time allows optimisation of product distribution and energy efficiency. Biomass feedstocks range from woody residues and agricultural wastes to invasive plant species, each presenting unique challenges in variability of mineral content, moisture and structural composition. Advances in understanding the kinetics and heat transfer within particles have enabled development of autothermal or self-sustaining systems, reducing external energy inputs. Product applications span solid biochar for soil amendment and carbon sequestration, bio-oils for refining into drop-in fuels, and syngas for heat and power generation. The global significance of pyrolysis lies in its potential to integrate renewable energy, waste valorisation and circular economy objectives, supporting decarbonisation across multiple sectors.

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Pyrolysis Processes in Biomass Conversion publication trend

The graph below shows the total number of articles in pyrolysis processes in biomass conversion across all publications each year (not limited to Nature Index journals).

Technical terms

Pyrolysis: Thermal decomposition of organic matter in an oxygen-free environment, producing char, bio-oil and gas.

Biochar: Carbon-rich solid residue from pyrolysis, used for soil improvement, carbon storage or filtration.

Devolatilisation: Release of volatile compounds from biomass during heating, leading to the formation of gases and condensable vapours.

Feedstock variability: Natural differences in biomass composition (moisture, mineral content, structure) that affect thermal conversion behaviour.

Heating rate: Speed at which temperature is increased during pyrolysis, influencing product yields and reaction kinetics.

Exothermicity: Release of heat during chemical reactions, critical for autothermal operation of pyrolysis systems.

References

1. Dynamics and products of potato crop residue conversion under a pyrolytic runaway regime - Influences of feedstock variability. Energy (2023).
2. Heracleum sosnowskyi pyrolysis – Energy and environmental aspects of biochar utilization. Bioresource Technology (2024).
3. Demineralization Pretreatments for Reducing Biomass Variability in Pyrolysis. ACS Omega (2024).