STUDY OF THE REACTION PARAMETERS FOR CO₂ CONVERSION INTO CYCLIC CARBONATES USING L-HISTIDINE HYDROBROMIDE AS A CATALYST

This work investigates the use of amino acid-based organocatalysts for the chemical conversion of CO₂ into propylene carbonate, aiming to develop a sustainable alternative for CO₂ valorization. Among the catalysts evaluated, L-histidine hydrobromide showed the highest catalytic activity, reaching 98% conversion under the initial reaction conditions. The effects of CO₂ pressure and temperature were subsequently optimized, demonstrating that higher pressures (1.0 MPa) and elevated temperatures (120 °C) significantly enhance the conversion efficiency, achieving conversions above 99%. These findings highlight the potential of L-histidine hydrobromide as an efficient, metal-free organocatalyst for cyclic carbonate synthesis. Future studies will investigate its applicability to a broader range of epoxides and assess the scalability of the optimized reaction conditions.