Synthesis and Carbon Dioxide Sorption of Layered Double Hydroxide/Silica Foam Nanocomposites with Hierarchical Mesostructure.

Layered double hydroxides (LDHs) with a hierarchical mesostructure are successfully synthesized on mesoporous silica foams by simple impregnation and hydrothermal treatment. The as-synthesized LDH/silica foam nanocomposites show well-defined mesostructures with high surface areas, large pore volumes, and mesopores of 6-7 nm. The nanocomposites act as carbon dioxide (CO₂) sorbents under simulated flue gas conditions. They also exhibit significantly enhanced CO₂ capacities under high-pressure conditions and high CO₂/N₂ and CO₂/CH₄ selectivities. [ABSTRACT FROM AUTHOR]