SiO2-layered double hydroxide microspheres and method for making the same

摘要

A method of making silica-layered double hydroxide microspheres having the formula I         (SiO)@{[MM'(OH)](X)•bHO•c(AMO-solvent)}     (I)wherein,Mand M'are two different charged metal cations;z = 1 or 2;y = 3 or 4;0 x 0.9;b is 0 to 10;c is 0 to 10;p 0,q 0,Xis an anion; with n 0a = z(1-x) + xy-2; andthe AMO-solvent is an 100% aqueous miscible organic solvent;comprises the steps:(a) contacting silica microspheres and a metal ion containing solution containing metal ions Mand M'in the presence of a base and an anion solution;(b) collecting the product; and(c) optionally treating the product with AMO-solvent and recovering the solvent treated material to obtain the silica-layered double hydroxide microspheres.Preferably, M in the formula I is Li, Mg, Ni or Ca. Preferably, M' in formula I is Al.The invention further provides silica-layered double hydroxide microspheres having the formula I.The silica-layered double hydroxide microspheres may be used as catalysts and/or catalyst supports.