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The behavior of two hybrid catalysts: inorganic/organic (KI/chitin) and inorganic/inorganic (KI/amorphous silica-alumina) on the CO 2  cycloaddition to Propylene oxide has been compared. Conversions of KI/chitin and KI/Si-Al were 99 and 97% respectively. KI/Si-Al shows a type IV N 2  adsorption isotherm at P 0 /P of 0.6-0.9 of mesoporous nature with a significant concentration of Lewis acid sites, its FT-IR analysis shows that CO 2  can be adsorbed as organic “bridging” carbonate onto the support’s surface, which has an important role in the reaction mechanism. Kinetic analysis shows that the organic co-catalyst is up to 1.5 times faster for the CO 2  cycloaddition than the inorganic co-catalyst at 160 °C bu both show very similar rate at 120 °C. Both supported catalysts show a significantly lower  E athan that calculated for free KI, although both show comparable activation energies. This insight gives interesting findings on how hybrid catalyst systems behave in an utmost crucial CO 2  fixation reaction, being the foundations of future investigation on scale-up applications.

chemical engineering communications

Study of catalyst performance of two inorganic/organic and inorganic/inorganic hybrid catalysts on the CO 2  cycloaddition to propylene oxide: kinetics and thermodynamics