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Solid base catalysts derived from Ca-Al-X (X = F-, Cl- and Br-) layered double hydroxides for methanolysis of
Yunhui Liao1,2, Feng Li1, Yanfeng Pu1
1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences 27# South Taoyuan Road Taiyuan 030001 P. R. China lifeng2729@sxicc.ac.cn xiaofk@sxicc.ac.cn.
Abstract:
The Ca-Al and Ca-Al-X (X = F-, Cl- and Br-) catalysts were prepared via thermal decomposition of Ca-Al layered double hydroxides (LDHs), and tested for methanolysis of propylene carbonate (PC) to produce dimethyl carbonate (DMC). The catalytic performance of these catalysts increased in the order of Ca-Al-Br- < Ca-Al < Ca-Al-Cl- < Ca-Al-F-, which was consistent with the strong basicity of these materials. The recyclability test results showed that the addition of Al and halogens (F-, Cl- and Br-) not only stabilized the CaO but also improved the recyclability of the catalysts. Particularly, the Ca-Al-F- catalyst exerted the highest stability after 10 recycles. These catalysts have an important value for the exploitation of DMC synthesis by transesterification of PC with methanol.
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