Conversion of Cellobiose to Formic Acid as a Biomass-Derived Renewable Hydrogen Source Using Solid Base Catalysts.

Area of Science:

• Green Chemistry
• Catalysis
• Biomass Conversion

Background:

• Formic acid is a key hydrogen carrier derived from biomass.
• Oxidative decomposition of sugars offers a route to biomass-derived formic acid.
• Cellobiose, a glucose-based disaccharide, is a potential feedstock.

Purpose of the Study:

• To explore formic acid production from cellobiose using heterogeneous catalysts.
• To investigate mild reaction conditions for efficient formic acid synthesis.
• To overcome challenges in selective formic acid production from cellobiose.

Main Methods:

• Utilized alkaline earth metal oxide solid base catalysts (CaO, MgO) with hydrogen peroxide.
• Employed a combination of solid acid and solid base catalysts.
• Conducted reactions at mild temperatures (343 K).

Main Results:

• CaO catalyst yielded 14% formic acid but formed harmful CaO2.
• MgO catalyst produced formic acid without peroxide formation.
• Combined acid-base catalysis achieved a 33% formic acid yield due to efficient cellobiose hydrolysis and selective glucose decomposition.

Conclusions:

• Combined solid acid and base catalysis significantly enhances formic acid yield from cellobiose.
• Mild reaction conditions and heterogeneous catalysts offer a sustainable route for formic acid production.
• This approach avoids problematic metal peroxide byproducts, presenting a greener alternative.