Kinetic Analysis of Glycerol Esterification Using Tin Exchanged Tungstophosphoric Acid on K-10

Area of Science:

• Catalysis
• Green Chemistry
• Materials Science

Background:

• Glycerol acetins (mono-, di-, tri-) are key industrial chemicals derived from glycerol esterification with acetic acid.
• Their application as fuel additives is crucial for environmental sustainability and the economic viability of biorefineries.
• Developing efficient and eco-friendly catalytic processes for acetin production is essential.

Purpose of the Study:

• To synthesize and characterize novel tin-exchanged tungstophosphoric acid catalysts supported on montmorillonite K-10 for glycerol esterification.
• To investigate the catalytic activity and optimize reaction parameters for high glycerol triacetin yields.
• To evaluate the kinetic model and recyclability of the developed catalyst.

Main Methods:

• Synthesis of tin-exchanged tungstophosphoric acid (Sn-DTP) on montmorillonite K-10 (K-10) supports.
• Characterization using BET, XRD, FT-IR, UV-vis, and titration techniques.
• Optimization of reaction parameters and kinetic modeling using the Langmuir-Hinshelwood dual-site model.

Main Results:

• The Sn1-DTP/K-10 catalyst demonstrated superior activity in glycerol esterification compared to the parent catalyst.
• Optimized conditions yielded high production of glycerol triacetin.
• The Langmuir-Hinshelwood dual-site model accurately described the reaction kinetics.
• The catalyst maintained significant activity after four recycling cycles.

Conclusions:

• Tin-exchanged tungstophosphoric acid on K-10 is a highly effective and recyclable catalyst for glycerol acetin production.
• The developed process is environmentally friendly and suitable for biorefinery applications.
• This research contributes to sustainable chemical synthesis and fuel additive development.