Highly Active Benzotriazolium Ionic Liquid-modified Periodic Mesoporous Organosilica Supported Samarium/Lanthanum Nanoparticles for Sustainable Transformation of Carbon Dioxide to Cyclic Carbonates

Abstract. A novel type of multifunctional nanocatalysts (La-/Sm-PMO-ILCl) based on the immobilization of benzotriazolium ionic liquid and further incorporation of samarium acetate or lanthanum acetate onto periodic mesoporous organosilica were afforded for the cycloaddition of CO2 and epoxides to produce cyclic carbonates. In consequence of the intramolecular synergistic effect between samarium sites of periodic mesoporous organosilica and homogeneously dispersed basic sites of ionic liquid, the powerful catalyst Sm-PMO-ILCl offered superior catalytic performance with ultra high yields and selectivities in the cycloaddition reaction without the addition of any solvent and cocatalyst. Moreover, the catalyst Sm-PMO-ILCl could be easily recovered by filtration and reused for at least five runs without any significant loss of its catalytic activity. Resumen. Se prepararon nuevos nano catalizadores (La-(Sm-PMO-ILC1) por la via de inmovilizacion del liquido ionico benzotriazolium y adicion se acetato de samario o acetato de lantano en organosilice mesoporosa. Los catalizadores se evaluaron en la ciclo adicion de CO2 y epoxidos para producir carbonatos ciclicos. El efecto sinergico intramolecular entre los sitios de samario de la organosilice y los sitios basicos del liquido ionico homogeneamente distribuidos inducen una alta actividad catalitica en el catalizador Sm-PMO-ILC1. Asi, con este catalizador se obtuvo alta conversion y selectividad en la reaccion de ciclo adicion, sin agregar solvente ni co-catalizador. Ademas, el catalizador Sm-PMO-ILC1 podria recuperarse facilmente por filtracion y reusado por al menos 5 corridas sin perdida significativa de su actividad catalitica.