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DOI: 10.1039/A901943J (Paper) Reference Section for: Phys. Chem. Chem. Phys., 1999, 1, 3047-3051

Cycloaddition between propylene oxide and CO2 over metal oxide supported KI

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Tiansheng Zhao, Yizhuo Han and Yuhan Sun

Abstract

A novel catalyst system composed of KI supported on metal oxides for cycloaddition of propylene oxide with CO2 was investigated. It was found that the activity of KI for cycloaddition was strongly enhanced by ZnO as both support and promoter, resulting in a high yield of propylene carbonate within a short reaction time. Based on the characterization of BET, XRD, TG, IR and XPS-AES, this enhancement could be attributed to both the interaction between KI and amphoteric ZnO, which gave rise to the concerted active Lewis acid–base pairs of Iδ-Mδ+ and Kδ+O-δ and the dispersion of KI on the surface of the supports. The catalytic mechanism was then proposed.

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