Citation: Yunhui Liao, Feng Li, Xin Dai, Ning Zhao, Fukui Xiao. Solid base catalysts derived from Ca-M-Al (M=Mg, La, Ce, Y) layered double hydroxides for dimethyl carbonate synthesis by transesterification of methanol with propylene carbonate[J]. Chinese Journal of Catalysis, ;2017, 38(11): 1860-1869. doi: 10.1016/S1872-2067(17)62898-5 shu

Solid base catalysts derived from Ca-M-Al (M=Mg, La, Ce, Y) layered double hydroxides for dimethyl carbonate synthesis by transesterification of methanol with propylene carbonate

Yunhui Liao ^a,b, ,
Feng Li ^a ,
Xin Dai ^a,b ,
Ning Zhao ^a,c ,
Fukui Xiao ^a,c

a State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China;
b University of Chinese Academy of Sciences, Beijing 100049, Shanxi, China;
c National Engineering Research Center for Coal-Based Synthesis, Taiyuan 030001, Shanxi, China

Received Date: 11 July 2017
Revised Date: 15 August 2017

Fund Project: This work was supported by the Natural Science Foundation of Shanxi Province (201601D102006) and the Key Science and Technology Program of Shanxi Province, China (MD2014-09, MD2014-10).

Composite solid base catalysts derived from Ca-M-Al (M=Mg, La, Ce, Y) layered double hydroxides (LDH) were synthesized, characterized and applied to the transesterification of methanol with pro-pylene carbonate. X-ray diffraction analyses of the catalysts show that all of the catalysts were in the form of composite oxides. Compared with the Ca-Al LDH catalyst, the specific surface areas and pore volumes of the catalysts were increased with the introduction of Mg, La or Ce. The catalytic perfor-mance of these catalysts increases in the order of Ca-Y-Al < Ca-Al < Ca-Ce-Al < Ca-La-Al < Ca-Mg-Al, which is consistent with the total surface basic amounts of these materials and the formation of especially strong basic sites following modification with Mg and La. The Ca-Mg-Al catalyst shows the highest (Ca+Mg):Al atomic ratio, indicating that it likely contains more unsaturated O^2- ions, providing it with the highest concentration of very strong basic sites. The recyclability of these cat-alysts is improved following the addition of Mg, La, Ce or Y, with the Ca-Mg-Al maintaining a high level of activity after ten recycling trials. X-ray diffraction analyses of fresh and used Ca-Mg-Al demonstrate that this catalyst is exceptionally stable, which could be of value in practical applica-tions related to heterogeneous catalysis.
- Ca-M-Al layered double hydroxide,
- Solid base,
- Transesterification,
- Dimethyl carbonate
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