Pseudo-bridging silanols as versatile Brønsted acid sites of amorphous aluminosilicate surfaces.
Amorphization tunes acidity: Pseudo-bridging silanols, suggested as versatile Brønsted acid groups by molecular modeling studies, are obtained by shifted hydrolysis of Si-O-Al bridges formed by the thermal treatment of silica deposited on gamma-Al(2)O(3) (100), and appear under given pretreatment conditions. Demixing of part of the silica from the aluminosilicate phase is predicted upon excess water adsorption.
Chizallet
Céline
C
Direction Catalyse et Séparation, IFP-Lyon, BP3, 69360 Solaize, France. celine.chizallet@ifp.fr
Raybaud
Pascal
P