Abstract
The immobilization of 1-butyl-3-methylimidazolium chloride (BMIMCl) was achieved via the intercalation of BMIMCl into layered θ-zirconium phosphate (θ-ZrP), a hydrated form of α-zirconium phosphate. The intercalation process was studied by controlling the feed ratio of BMIMCl to θ-ZrP. X-ray diffraction characterization revealed that the formed intercalation compounds exhibited multiple phases depending on the intercalation ratio. θ-ZrP served as an excellent host for the intercalation of BMIMCl. The immobilized BMIMCl was evaluated via a coupling reaction of CO2 and propylene oxide to synthesize propylene carbonate. The results showed that the immobilized BMIMCl could maintain a similar catalytic reactivity to un-supported BMIMCl. After immobilization, the BMIMCl catalyst could be effectively separated from the products and recycled, and the recycled catalyst maintained high reactivity. Overall, the immobilization of BMIMCl into θ-ZrP enables BMIMCl to be a “greener” catalyst for a green chemical process.
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