Patent ID: 8247539
Filing Date: 2012-08-21
Classification: B01J,C04B,C07F

Abstract:
1. A grafting process for preparing a hybrid organic-inorganic material (HOIM) with phosphorus-containing bonds between the surface of a solid inorganic substrate containing at least one element M and one or more organic groups, said bonds being of the covalent M-O-P-R type, said process comprising a) pretreating solid inorganic substrate, to remove residual water comprising heating said substrate to a temperature in the range of 20° C. to 300° C. at an absolute gas pressure in the range of 0.01 Pa to 0.2 MPa and for a period in the range of 1 to 20 hours, b) contacting resultant pretreated inorganic substrate with an anhydrous organic solution of a precursor for said organic group or groups, wherein said precursor is constituted by at least one organophosphorus acid chloride with formula RxP(O)Xy in which x=1or 2, y=3-x, X being chlorine and R designating at least one organic alkyl, aryl or aryl-alkyl group to produce covalent M-O-P-R bonds between the organic and inorganic phases; c) filtering and washing the solid obtained in step b); d) heat treating the solid obtained in step c) at a temperature in the range 25° C. to 500° C., at an absolute air pressure in the range of 0.01 Pa to 0.2 MPa in which M is selected from groups IB, IIB, IIIB, IVB, VB, VIB, VIIB, VIII, IA, IIA, IIIA, IVA, VA, the lanthanides and actinides of the periodic table, and wherein the process avoids the formation of lamellar phases in the surface of the inorganic substrate.