The effect of trivalent cations on the performance of Mg-M-CO(3) layered double hydroxides for high-temperature CO(2) capture.
The effect of trivalent cations on the performance of Mg-M-CO(3) (M=Al, Fe, Ga, Mn) layered double hydroxides (LDHs) for high-temperature CO(2) capture is systematically investigated for the first time. We demonstrate that the M(3+) determines the structure evolution of LDH derivatives under thermal treatment, and finally influences the CO(2) capture capacity. Very different calcination temperatures are required for the different LDHs to obtain their maximum CO(2) capture capacities. To have a clear understanding of the reason behind these big differences the physicochemical properties, thermal stability, and memory effect of the LDHs were investigated. Both the thermal stability and the memory effect of LDHs are greatly influenced by the type of trivalent cation. The CO(2) capture capacities were also evaluated under various conditions. Another important finding of this work is that the quasi-amorphous phase obtained by thermal treatment at the lowest possible temperature gives the highest CO(2) capture capacity.
Wang
Qiang
Q
Institute of Chemical and Engineering Sciences, A*STAR, Jurong Island, Singapore.
Tay
Hui Huang
HH
Ng
Desmond Jia Wei
DJ
Chen
Luwei
L
Liu
Yan
Y
Chang
Jie
J
Zhong
Ziyi
Z
Luo
Jizhong
J
Borgna
Armando
A
D000327:Adsorption; D002152:Calorimetry, Differential Scanning; D002245:Carbon Dioxide / Q000737:chemistry* / Q000302:isolation & purification*; D057965:Carbon Sequestration; D002412:Cations / Q000737:chemistry; D011232:Chemical Precipitation; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
D002412:Cations; D006878:Hydroxides; D010087:Oxides; D002245:Carbon Dioxide; D008274:Magnesium