Steam Explosion Pretreatment of Lignocellulosic Biomass
Summary
Steam explosion pretreatment employs high-pressure saturated steam to disrupt the rigid structure of lignocellulosic biomass through rapid depressurisation. This process combines thermal cracking of hemicellulose, partial solubilisation of lignin and explosive decompression to increase porosity, reduce polymerisation degree and enhance enzyme accessibility. It is widely applied to a variety of feedstocks, including woody and herbaceous species, agricultural residues and energy crops. By loosening cell-wall architecture and selectively removing hemicellulose, steam explosion elevates cellulose conversion during downstream enzymatic hydrolysis, thereby improving yields of fermentable sugars for biofuels and bioproducts. Practical implementation ranges from pilot-scale biorefineries to large-scale commercial operations, where optimisation of severity (temperature, pressure and time) and post-treatment washing is essential to balance sugar yield, inhibitor formation and process economics. Advanced variants such as acid-impregnated, instant catapult and assisted-steam designs further refine lignin–carbohydrate complex breakdown and reduce condensation side-reactions. Ongoing efforts focus on integration within circular biorefineries, valorisation of residual lignin streams and reduction of energy and capital costs to support sustainable bioeconomy objectives.
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Steam Explosion Pretreatment of Lignocellulosic Biomass publication trend
The graph below shows the total number of articles in steam explosion pretreatment of lignocellulosic biomass across all publications each year (not limited to Nature Index journals).
Technical terms
Lignocellulosic biomass: Plant material composed of cellulose, hemicellulose and lignin forming a rigid, recalcitrant matrix.
Steam explosion: A pretreatment process using high-pressure steam followed by rapid depressurisation to fracture biomass structure.
Explosive decompression: Sudden pressure release that physically ruptures cell walls to increase porosity and surface area.
Severity factor: A combined measure of temperature and residence time used to quantify pretreatment intensity.
Enzymatic hydrolysis: The bioconversion of cellulose and hemicellulose into fermentable sugars by cellulase and hemicellulase enzymes.
References
- Enhanced enzymatic sugar production from corn stover by combination of water extraction and glycerol-assisted instant catapult steam explosion. Bioresources and Bioprocessing (2024).
- Steam explosion pretreatment enhancing enzymatic digestibility of overground tubers of tiger nut (Cyperus esculentus L.). Frontiers in Nutrition (2023).
- Understanding the structural and chemical changes of plant biomass following steam explosion pretreatment. Biotechnology for Biofuels and Bioproducts (2017).
- Steam Explosion Pretreatment of Lignocellulosic Biomass: A Mini-Review of Theorical and Experimental Approaches. Frontiers in Chemistry (2021).
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