High surface area supports with strong Bronsted acidity in an open porosity

摘要

Two routes for the preparation of high surface area silica-alumina materials with strong Bransted acidity and open porosity are examined:one uses the organisation of beta-zeolite seeds with surfactant micelles,and the other the delamination of Al-Magadiite,a naturally occurring sodium phyllosilicate.The textures of these materials are characterised using N_2-sorption and the localisation of most of the Al in tetrahedral substitution in the silica framework is shown using ~(27)Al MAS NMR.These two materials show good activity for the cracking of cumene.Furthermore,the characterization of their acidity by FTIR of adsorbed CO reveals the presence of strong and medium Bransted acid sites.