Flying Green: New Catalytic Tech Converts Lignin into Sustainable Aviation Fuel

In a major stride toward sustainable air travel, scientists have developed a feedstock-agnostic catalytic method to convert lignin—a tough, aromatic plant polymer—into drop-in sustainable aviation fuels (SAFs).

The new process, which combines platinum-based catalytic hydrodeoxygenation (Pt-HDO) with alkaline pretreatment, efficiently removes oxygen from lignin-derived compounds, creating a hydrocarbon fuel blend that meets the criteria for jet fuel use.

Drop-in sustainable aviation fuels enabled by feedstock-agnostic lignin deoxygenation

How It Works

Alkaline depolymerization breaks lignin into monomeric aromatics
Pt-HDO catalyst selectively removes oxygen atoms at 250–350°C
Final product: a high-energy, low-oxygen, jet-fuel-compatible hydrocarbon mixture

The resulting SAF has comparable energy density to fossil jet fuel and can be blended directly with existing fuels, requiring no changes to current aviation engines or infrastructure.

Key Benefits

Feedstock-agnostic: Works with diverse lignin sources (agricultural, forestry, etc.)
Drop-in ready: Compatible with existing aviation fuel systems
Low carbon footprint: Reduces lifecycle emissions by up to 70%
Scalable and cost-effective: Uses available catalysts and moderate temperatures
No toxic byproducts: Clean conversion to usable hydrocarbons

Real-World Impact

This innovation addresses two global crises at once:

Carbon emissions from aviation, which account for ~2.5% of global CO₂ output
Lignin waste management, with over 50 million tons discarded annually from biomass industries

Catalytic Breakthrough for Green Aviation Fuel

Reference

Webber, M. S., Yang, Z., Bell, D. C., Brandner, D. G., Bussard, J. R., Watson, J., … & Román-Leshkov, Y. (2025). Drop-in sustainable aviation fuels enabled by feedstock-agnostic lignin deoxygenation. Cell Reports Physical Science. DOI: 10.1016/j.xcrp.2025.102687