Catalytic Pyrolysis of Algal Biomass for Biofuel Production

Catalytic pyrolysis of algal biomass entails the thermal decomposition of dried microalgae in the absence of oxygen in the presence of solid catalysts to produce liquid hydrocarbons, gaseous products and solid char. Algal feedstocks offer advantages over terrestrial biomass owing to rapid growth rates, high lipid content and minimal competition for arable land. In a typical process, biomass is heated rapidly to 400–600 °C, and vapours pass through a catalyst bed—often zeolitic or metal‐supported—where oxygenated intermediates undergo deoxygenation, cracking and aromatisation to yield hydrocarbon‐rich bio-oil. The catalyst both lowers activation energies and steers product selectivity towards energy-dense fractions. Integration of fractional pyrolysis, where proteins and carbohydrates are volatilised at lower temperature before lipid‐rich fractions are upgraded at higher temperature, further enhances aromatic yield and purity. Downstream hydrotreatment under hydrogen pressure can remove residual oxygen and nitrogen, yielding drop-in liquid fuels suitable for transport applications. Challenges remain in catalyst deactivation by inorganics, energy consumption for drying and scale-up economics, but recent advances in catalyst design, reactor integration and process intensification point to a viable pathway for sustainable algal-derived biofuels.

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Catalytic Pyrolysis of Algal Biomass for Biofuel Production publication trend

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Technical terms

Catalytic pyrolysis: Thermal degradation of biomass in an oxygen-free environment in the presence of a solid catalyst to enhance deoxygenation and tailor product distribution.

Bio-oil: The liquid condensate from pyrolysis vapours, comprised of oxygenated organics, hydrocarbons and water, which can be upgraded to fuels.

Zeolite: A crystalline microporous aluminosilicate catalyst with tunable acidity and pore structure used to promote cracking and aromatisation.

Deoxygenation: Catalytic removal of oxygen functional groups (e.g. via decarboxylation and dehydration) to improve bio-oil stability and heating value.

Hydrotreatment: Catalytic upgrading of bio-oil under hydrogen pressure to reduce oxygen and nitrogen heteroatoms, yielding drop-in hydrocarbons.

Fractional pyrolysis: Sequential pyrolysis at different temperatures to separately volatilise and upgrade distinct biomass fractions (proteins/carbohydrates versus lipids).

References

1. Optimization bio-oil production from Chlorella sp. through microwave-assisted pyrolysis using response surface methodology. Green Energy and Resources (2024).
2. Experimental studies on a two-step fast pyrolysis-catalytic hydrotreatment process for hydrocarbons from microalgae (Nannochloropsis gaditana and Scenedesmus almeriensis). Fuel Processing Technology (2020).
3. In situ and Ex situ Catalytic Pyrolysis of Microalgae and Integration With Pyrolytic Fractionation. Frontiers in Chemistry (2020).