NICKEL AND COBALT CONTAINING HYDROTALCITE-LIKE MATERIALS HAVING A SHEET-LIKE MORPHOLOGY AND PROCESS FOR PRODUCTION THEREOF

摘要

A synthetic nickel (or cobalt) containing hydrotalcite-like material having a sheet-like morphology and a sheet broadness to thickness ratio of at least 50 and a formula M1-xAlx(OH)2.xA.mH2O where M is Ni or Co, A is a mono carboxylic anion of the form RCOO- where R is CnH2n+1 and n=0-5, and x and m are numbers satisfying the following conditions: 0.2 = x < = 0.4, 0.0 < =m = 4. It is made by starting with a synthesis mixture having Ni or Co (divalent cation) to aluminum (trivalent cation) molar ratio between 1:1 and 10.1, mono carboxylic anion to aluminum (trivalent cation) molar ratio between 0.1:1 to 1.2:1 and optionally added other anions. The process comprises of reacting a mixture comprising nickel (or cobalt) and aluminum cations and mono carboxylic anions in an aqueous slurry at a temperature of at least 40.degree.C and a pH of at least 7.