Patent ID: 11904268
Assignee: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B

Claim 0:
1. A porous silicate sol-gel matrix comprising at least one aminic reagent selected from hydroxylamine, methylhydroxylamine, tert-butylhydroxylamine, methoxyamine, tetraethylenepentamine, and dicarboxylic acid dihydrazides, and salts thereof, the at least one aminic reagent being trapped in pores of the porous silicate sol-gel matrix,
wherein the porous silicate sol-gel matrix is prepared by a process comprising the steps of:
a) synthesizing a gel from tetramethoxysilane or a mixture of tetramethoxysilaneand another organosilicon precursor, selected from phenyltrimethoxysilane, phenyltriethoxysilane, fluoroalkyltrimethoxysilane, fluoroalkyltriethoxysilane, chloroalkylmethoxysilane, chloroalkylethoxysilane, alkyltrimethoxysilane, alkyltriethoxysilane, aminopropyltriethoxysilane and mixtures thereof, the synthesizing being carried out in an aqueous medium at a temperature of from 10 to 70° C. in the presence of at least one aminic reagent selected from hydroxylamine, methylhydroxylamine, tert-butylhydroxylamine, methoxyamine, tetraethylenepentamine, and dicarboxylic acid dihydrazides, and salts thereof, and
b) drying the gel obtained in step a) to give a porous silicate sol-gel matrix comprising at least one aminic reagent in which the at least one aminic reagent is trapped in the pores of the porous silicate sol-gel matrix,
wherein the porous silicate sol-gel matrix has a specific adsorption surface area of 15±2 m2·g−1 to 900±100 m2·g−1, and
wherein the at least one aminic reagent content of said porous silicate sol-gel matrix is from 0.8 mol·dm−3 to 8.0 mol·dm−3.