Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Synthesis of propylene carbonate from carbon dioxide and propylene oxide using Zn-Mg-Al composite oxide as high-efficiency catalyst

Language

English

Abstract

A series of Zn-Al composite oxides that were modified with alkaline earth metals, Zn-M-Al-O (M = Mg, Ca, Sr, and Ba) were fabricated via calcination of the corresponding hydrotalcite precursors, and evaluated as catalysts for the synthesis of propylene carbonate (PC) from CO2 and propylene oxide. Among the Zn-M-Al-O catalysts, Zn-Mg-Al-O (Zn/Mg = 4.0, pH = 10, without hydrothermal treatment) is the best in performance, showing PC selectivity of 99.2% and yield of 88.8% (140 °C, 12 h). Furthermore, the Zn-Mg-Al-O catalyst can be readily reused and recycled without any loss of activity in a test of five cycles. Through detailed studies of the basic nature of the Zn-M-Al-O catalysts, it was found that a moderate basicity (6.1 ≤ H 0 < 8.9) is beneficial to the cycloaddition reaction. The NH 3- and CO2-TPD results also indicate that the Zn-Mg-Al-O catalyst has acid-base bifunctional properties, and a reaction mechanism is proposed. Graphic Abstract: Zn-Mg-Al composite oxides were prepared via calcination of the corresponding hydrotalcite precursors, and used as catalysts for the synthesis of propylene carbonate from CO2 and propylene oxide. We achieved high catalytic efficiency under mild conditions, easy separation of catalyst from the product, and good recyclability of the catalyst. A plausible reaction mechanism has been proposed for the catalytic action. © 2009 Springer Science+Business Media, LLC.

Keywords

Carbon dioxide, Heterogeneous catalysis, Propylene carbonate, Propylene oxide, Zn-Mg-Al-O composite oxide

Publication Date

2010

Source Publication Title

Catalysis Letters

Volume

136

Issue

2-1

Start Page

35

End Page

44

Publisher

Springer Verlag

DOI

10.1007/s10562-009-0198-2

Link to Publisher's Edition

http://dx.doi.org/10.1007/s10562-009-0198-2

ISSN (print)

1011372X

ISSN (electronic)

1572879X

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