Patent ID: 8168156

Claim:
A method of fabricating a layered nanomaterial used for mid-high temperature CO 2 capture, comprising steps of: (a) obtaining nitrate solutions of Ca +2 and Al +3 as cationic solutions and obtaining NaOH solutions and Na 2 CO 3 solutions as precipitating agents; (b) uniformly mixing said cationic solutions and said precipitating agents into a mixture solution; (c) processing a hydrothermal treatment to said mixture solution; (d) obtaining precipitates through centrifugal separation and precipitation; (e) water-washing said precipitates and then drying said precipitates to remove impurity of ions; and (f) processing said precipitates at a calcination temperature between 200° C. and 600° C. to obtain a CO 2 -capturing material which has Ca, Al carbonates, wherein said CO 2 -capturing material is a layered CO 2 -absorbing nanomaterial of Ca—Al—CO 3 having a micropore structure of CaO; wherein said CO 2 -capturing material is formed of nanoparticles of Ca and Al having dispersed particle sizes in a ratio range of 1:1 to 13:1 for Ca:Al; wherein said CO 2 -capturing material has a structure of specific layered double hydroxides (LDHs) having metal oxide microcrystallines; and wherein said nanoparticles has nanopores from mesopores to micropores.