Patent ID: 6838068
Filing Date: 2005-01-04
Classification: C01B

Abstract:
1. A method of producing a silica gel, which comprises: hydrolyzing a silicon alkoxide, thereby forming a hydrogel; and subjecting the hydrogel to a hydrothermal treatment substantially without aging the hydrogel, thereby producing said silica gel having the following characteristics: (a) a pore volume ranging from 0 6 to 1.6 ml/g, (b) a specific surface area ranging from 300 to 900 m (c) a mode diameter (Dmax) of pores of less than 20 nm, (d) a volume of pores having diameters within ±20% of Dmax of at least 50% of the total pore volume; (e) it is amorphous, and (f) the content of metal impurities is at most 500 ppm.