Crystalline (metallo)silicates and process for preparing such (metallo)silicates

Abstract

Crystalline (metallo)silicates having in the as-synthesized, anhydrous form a molar composition expressed by the formula: (0-9)M.sub.2/n O.(4-9)R.sub.2 O.100SiO.sub.2. (0-2)X.sub.2 O.sub.3, wherein M is an alkali or alkaline earth metal ion having a valency n, R represents a tetramethylammonium cation or a precursor thereof, X represents at least one of Al, Fe, B or Ga, and having a specific X-ray diffraction pattern. The silicates can be prepared from an aqueous mixture comprising a source of silicon, optionally a source of at least one of aluminium, iron boron or gallium, and a source of tetramethylammonium cations or precursors thereof, which mixture is kept at a temperature of between 140.degree.-240.degree. C. whereby the following requirement is fulfilled: T.gtoreq.244.5-18.2 ln t, wherein T is the temperature (in .degree.C.) and t is the period of time (in hours) during which the mixture is kept at temperature T, until a crystalline silicate is formed which is subsequently separated from the mother liquor and dried, and which may subsequently be calcined.

Dependencies are inferred from the claim text.