Minimizing Energy Demand in the Conversion of Levulinic Acid to γ‑Valerolactone via Photothermal Catalysis Using...

Area of Science:

• Green Chemistry
• Catalysis
• Biomass Valorization

Background:

• Lignocellulosic wastes offer a sustainable carbon source for chemical production.
• γ-Valerolactone (GVL) is a valuable platform chemical derived from cellulose via levulinic acid.
• Conventional GVL synthesis requires high energy input, limiting industrial application.

Purpose of the Study:

• To develop an energy-efficient and sustainable method for γ-valerolactone production.
• To explore the use of solvothermal-photothermal processes for biomass conversion.
• To utilize cost-effective Raney-Nickel as a photothermal catalyst.

Main Methods:

• A novel solvothermal-photothermal strategy was employed for γ-valerolactone synthesis.
• Isopropanol was used as a hydrogen source, replacing hazardous hydrogen gas.
• Raney-Ni catalyst's photothermal properties were exploited for efficient heating under mild conditions.

Main Results:

• Over 95% conversion of levulinic acid to γ-valerolactone was achieved in under 2 hours at 132°C.
• The process significantly reduced energy requirements compared to conventional methods.
• The Raney-Ni catalyst demonstrated high reusability, indicating process robustness.

Conclusions:

• The proposed solvothermal-photothermal approach offers a sustainable and energy-efficient route for industrial γ-valerolactone production.
• This method aligns with green chemistry principles by utilizing renewable resources and minimizing energy consumption.
• The use of isopropanol and Raney-Ni catalyst presents a viable alternative for cleaner chemical manufacturing.