Abstract: A process for preparing a layered composition has been developed. The composition comprises an inner core and an outer layer comprising a molecular sieve. The process involves providing a slurry comprising inner core particles and sources of the framework elements of the molecular sieve. To this slurry there are added nutrient(s), i.e. framework element sources thereby forming crystals of the molecular sieve which agglomerate onto the inner core. The process is carried out for a time sufficient to form a layer of desired thickness.

Abstract: A method is disclosed for preparing molecular sieves of the zeolite type, particularly A, X and Y, in massive bodies that exhibit higher crush strengths than observed for prior art massive bodies. Sized unreactive kaolin-type clay, a pore generating material, and preferably a set strength enhancing agent are mixed with water to a consistency that can be shaped into preformed bodies. In the cases of zeolites X and Y silica may be included in the mixture. These bodies are calcined, optionally aged, and digested to convert them to massive bodies containing the desired zeolite.