METHOD OF PRODUCING POROUS SiO XEROGEL WITH CHARACTERISTIC PORE SIZE BY MEANS OF BOTTOM-UP METHOD USING PRECURSOR HAVING ORGANIC SOLID SKELETAL SUPPORTS Russian patent published in 2014 - IPC C01B33/16 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. SiO₂ xerogel is obtained via a sol-gel process from a silicon compound without solvent exchange by subcritical drying. Organic solid skeletal supports are made using organic monomers which are soluble or dispersible in polar protic solvents, which are added to a starting solution, a sol phase or after the beginning of gelation, such that the weight ratio of the organic component is not more than 20% of the silicate component. Inorganic xerogel with organic particles embedded in a mesh structure is dried at pressure of 1 bar and heat treated at temperature higher than 300°C.

EFFECT: disclosed method enables to obtain SiO₂ xerogel with pore size in the range of 1000 nm to 50 nm, density of less than 400 kg/m³ and content of chemically weakly bound carbon residues of less than 10%.

6 cl, 1 ex, 3 dwg