Abstract
The effect of trivalent cations on the performance of Mg-M-CO3 (M=Al, Fe, Ga, Mn) layered double hydroxides (LDHs) for high-temperature CO2 capture is systematically investigated for the first time. We demonstrate that the M3+ determines the structure evolution of LDH derivatives under thermal treatment, and finally influences the CO2 capture capacity. Very different calcination temperatures are required for the different LDHs to obtain their maximum CO2 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 CO2 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 CO2 capture capacity.
Original language | English |
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Pages (from-to) | 965-973 |
Number of pages | 9 |
Journal | ChemSusChem |
Volume | 3 |
Issue number | 8 |
DOIs | |
State | Published - Aug 2010 |
Externally published | Yes |
Keywords
- Carbon dioxide fixation
- Cations
- Hydrotalcites
- Solid-state structures
- Water-gas shift