PREPARATION OF POROUS AMORPHOUS SILICA FROM WATER GLASS AS RAW-MATERIALS

Amorphous porous silica was prepared from silicic acid and dicarboxylic acid dichlorides. Silicic acid was treated with malonyl dichloride, succinyl dichloride, adipoyl dichloride and sebacoyl dichloride in tetrahydrofuran (THF) at room temperature, and resulting powders were calcined at 450, 600 and 800-degrees-C for 3 h in the furnace under O2 atomsphere. The specific surface area of amorphous porous silica thus obtained could be controlled between 960 and 149 m2/g at 600-degrees-C by chosing the starting dicarboxylic acid dichloride and calcination temperature.