Patent ID: 7482400
Filing Date: 2009-01-27
Classification: C01P,C08K,C09C,C09K

Abstract:
1. A process for the dry impregnation of a highly porous mineral oxide which is silica, alumina, silica-alumina, zirconia or titanium oxide having a pore volume of at least 1 ml/g, comprising the steps of: a) impregnating said oxide with a sufficient amount of concentrated orthophosphoric or polyphosphoric acid, said impregnation being performed in a dry mode whereby said acid is added to said oxide, b) drying said oxide at atmospheric pressure at a temperature of between 100 and 200° C. for at least 3 hours, and, c) calcining said oxide at atmospheric pressure at a temperature of between 200° C. and 500° C. for at least 2 hours.