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| Proposed is a novel synthetic inorganic porous material having a chemical composition of the general formula [(SiO2)8 •(MO2/3)a •(OH)2/3a+b ]b- •b/c(Ac+), in which M is an ion of a divalent metal, e.g., Mg, A is a cation of an alkali metal, alkaline earth metal, hydrogen or ammonium, the subscript a is a positive number of 3 to 10, b is a positive number of 0.1 to 1 and c is a positive number of 1 to 2, and characterized by a specific surface area of 100 to 800 m2 /g, average pore diameter of 2 to 8 nm, pore volume of 0.1 to 0.8 cm3 /g and cation exchange capacity of 0.1 to 1.2 meq/g. This porous material is prepared by a method comprising the steps of: (a) mixing an aqueous solution of sodium silicate and an aqueous solution of a water-soluble salt of a divalent metal M, e.g., magnesium, to form hydrous oxides; (b) separating the hydrous oxides from the precipitation medium; (c) subjecting an aqueous slurry of the hydrous oxides to a hydrothermal reaction at a temperature of from 100° to 300° C.; and (d) drying and heating the hydrothermally obtained product at a temperature of from 100° to 1000° C. to effect dehydration. |
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