Patent ID: 8207086

Claim:
A method of fabricating a medium-high temperature CO 2 sorbent of layered nano-carbonate, the method comprising: obtaining reactants of calcium acetate (Ca(Ac) 2 ), aluminum nitrate (Al(NO 3 ) 3 ), and sodium carbonate (Na 2 CO 3 ) to process a reaction with sodium hydroxide (NaOH) which is added to control alkalinity; obtaining a layered material of calcium/aluminum (Ca/Al) carbonate after said reaction; calcining to remove anions and acetate in said layered material; synthesizing a nano-scale layered composite material of said Ca/Al carbonate (Ca(Ac) 2 —Al—CO 3 ), wherein said layered material is a layered double hydroxides (LDH) comprising two cations and two anions, said cations comprising Ca and Al; wherein a layer of oxide octahedron is obtained with said cations; wherein said layered material has layers containing carbonate (CO 3 2− ) and hydroxide (OH − ); wherein said octahedron is used as a template to remove said anions and said acetate based at least in part on the calcining; wherein said Ca(Ac) 2 —Al—CO 3 has micro-/mesopores; wherein each of said pores has a radius between 2 and 6 nanometers (nm); and fabricating the nano-scale layered composite material to capture carbon dioxide (CO 2 ).