Method for synthesis of zeolites having an aluminosilicio framework belonging to the structural group of faujasite, products obtained and their use in adsorption and catalysis.

摘要

An aluminosilicate gel containing a structuring agent ST and having a composition suitable for crystallising to a zeolite of the structural group of faujasite is prepared, the said gel is then subjected to a crystallisation in order to form a precursor of the zeolite consisting of the said zeolite containing the structuring agent ST in its cavities and channels and the zeolite is produced by calcination of the said precursor. The structuring agent ST consists of at least one compound chosen from the alkylene polyoxides of formula R-O-CmH2m-1X-OnR' in which R and R', which are identical or different, each represent H or a C1 to C4 alkyl radical, X denotes H or OH, m is equal to 2 or 3 and can be different from one unit to the next and n is a number greater than 12 and preferably of between 25 and 800. The zeolites obtained have an Si:Al ratio greater than 1 and which can exceed 3 and have a cubic symmetry. These zeolites can be used, directly or after cationic exchange, as adsorbents or as components of catalysts.