The effect of layer-interlayer Chemistry of LDHs on developing high temperature carbon capture materials
The layer-interlayer Chemistry of the layered double hydroxides (LDHs) offers a vast opportunity to develop mixed metal oxides (MMOs) as a novel sorbents for high temperature CO2 capture. Here we report a synthesis of adamanatanecarboxylate intercalated Ca-Al LDH by employing co-hydration method. Thermal decomposition under controlled atmosphere has converted the layered metal hydroxides as MMOs and intercalated anion into a carbonaceous support. The higher thermal stability and polymeric nature of the intercalated adamantanecarboxylate ion acts as thermal/mechanical support for the layered MMOs. The resultant hybrid solid sorbent shows excellent high temperature CO2 capture and cycling performance under both CO2 rich and lean (industrial flue gas) conditions. The hybrid sample shows near 100 % carbonation of all the active phase present leading to the maximum atom efficiency. The hybrid sorbent shows rapid kinetics for both carbonation and regeneration steps. The employed synthesis strategy offers a new approach to develop improved novel sorbents based on LDHs for high temperature CO2 capture.