Efficient Conversion of Pine Wood Lignin to Phenol

Area of Science:

• Biomass valorization
• Catalysis
• Sustainable chemistry

Background:

• Lignin, a major component of woody biomass, is an abundant renewable resource.
• Converting lignin into valuable chemicals like phenol is crucial for sustainability.
• Current methods for lignin conversion often face challenges in selectivity and efficiency.

Purpose of the Study:

• To develop an effective catalytic approach for converting lignin into phenol.
• To optimize a multi-step process involving depolymerization, demethylation, and dealkylation.
• To determine the overall yield of phenol from pinewood lignin.

Main Methods:

• Reductive depolymerization of pinewood lignin using a Pt/C catalyst to yield monomeric alkylmethoxyphenols.
• Selective methoxy group removal from lignin monomers using an optimized MoP/SiO2 catalyst to produce 4-alkylphenols.
• Zeolite-catalyzed transalkylation of 4-alkylphenols to generate a benzene stream, from which phenol is derived.

Main Results:

• Successfully obtained monomeric alkylmethoxyphenols from pinewood lignin.
• Developed a MoP/SiO2 catalyst for efficient selective demethylation.
• Achieved an overall phenol yield of 9.6 mol% based on the initial lignin content in pinewood.

Conclusions:

• The developed catalytic process offers an effective route for lignin valorization into phenol.
• This approach contributes to sustainable chemical production by utilizing biomass resources.
• The multi-step catalytic strategy demonstrates potential for industrial application in biorefineries.