23-P-21 - Novel delaminated zeolites are more active acid catalysts than conventional zeolites and mesoporous AI/MCM-41 for the synthesis of fine chemicals

ITQ-2 zeolite prepared by the delamination of MCM-22 precursor is formed by disordered individual sheets of crystalline zeolitic layers where the Bronsted acid sites are of zeolitic nature, and the vast majority of them are accessible to large molecules. The delaminated zeolite combines the acid characteristic of microporous zeolites with accessibility of the sites of mesoporous Al/MCM-41 and amorphous silica alumina. The superior catalytic performance of delaminated zeolites compared to conventional zeolites and Al/MCM-41 is exemplified for reactions involving large reactant molecules—namely, the preparation of dimethyl acetals, the Beckmann rearrangement of bulky cycloalkanone oximes, and the hydroxylation of aromatics.