Solid Molecular Phosphine Catalysts for Formic Acid Decomposition in the Biorefinery

Area of Science:

• Catalysis
• Materials Science
• Green Chemistry

Background:

• Formic acid co-production during cellulose to levulinic acid conversion presents opportunities for hydrogen generation.
• Efficient and selective catalysts are needed for formic acid decomposition and its removal from reaction mixtures.

Purpose of the Study:

• To develop and evaluate phosphorus-based porous polymers loaded with Ru complexes for base-free formic acid decomposition.
• To assess catalyst performance, stability, and applicability in selective formic acid removal.

Main Methods:

• Synthesis of phosphorus-based porous polymers.
• Loading polymers with ruthenium (Ru) complexes.
• Testing catalytic activity and selectivity for formic acid decomposition to CO2 and H2.
• Performing catalyst recycling and applicability studies.

Main Results:

• The Ru-loaded polymeric analogue of 1,2-bis(diphenylphosphino)ethane) (DPPE) demonstrated high activity and selectivity.
• Catalysts showed good stability with low leaching over seven recycling runs.
• Effective selective removal of formic acid from crude levulinic acid synthesis products was achieved.

Conclusions:

• Phosphorus-based porous polymers with Ru complexes are effective catalysts for base-free formic acid decomposition.
• These catalysts offer a viable route for on-site hydrogen production and purification of levulinic acid.
• The developed materials show promise for integrated biorefinery processes.