Silica gel

Details Silica gel Silica gel

2006-07-11

2006-07-11

Johnson, Edward M. (Department: 1754)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

Reexamination Certificate

active

07074376

ABSTRACT:
A method of producing a silica gel by hydrolyzing a silicon alkoxide and subjecting the resulting hydrogel to a hydrothermal treatment substantially without aging it is described. Also described in a silica gel produced by such a method and a silica gel which has the following characteristics:(a) the pore volume is from 0.6 to 1.6 ml/g,(b) the specific surface area is from 300 to 900 m2/g,(c) the mode diameter (Dmax) of pores is less than 20 nm,(d) the volume of pores having diameters within ±20% of Dmax is at least 50% of the total pore volume,(e) it is amorphous, and(f) the content of metal impurities is at most 500 ppm.

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