Simple and Effective HPLC Method for Elucidating Glycerol Oxidation Products

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Catalysis

Background:

• Glycerol electrooxidation reaction (GEOR) is a promising alternative to oxygen evolution for enhanced H₂ production and valuable coproducts.
• Simultaneous detection and quantification of multiple C₃, C₂, and C₁ products in GEOR remain a significant analytical challenge.

Purpose of the Study:

• To develop and optimize a high-performance liquid chromatography (HPLC) method for simultaneous quantification of eight GEOR products.
• To validate an indirect quantification approach for overlapping signals.
• To analyze GEOR product distribution under varying pH conditions using different electrocatalysts.

Main Methods:

• Development and optimization of a single diode array detector (DAD)-based HPLC method.
• Application of the HPLC method to electrochemical GEOR systems with Ni (alkaline) and Pt (acidic) catalysts.
• Utilized an indirect quantification strategy to resolve signal overlaps.

Main Results:

• Successfully detected and quantified eight distinct GEOR products using the optimized HPLC-DAD method.
• Demonstrated significant shifts in product selectivity based on pH: formate dominated in alkaline media (~68%), while glyceraldehyde (~40%) and dihydroxyacetone (~26%) were major in acidic media.
• Validated the method's applicability to real electrochemical systems.

Conclusions:

• The developed HPLC method provides a robust tool for comprehensive analysis of GEOR products.
• pH is a critical factor influencing GEOR product selectivity, impacting the efficiency of hydrogen production and valuable chemical generation.
• This work addresses a key analytical gap, facilitating further research and optimization of GEOR processes.