Process for producing crystalline gallosilicates

A process for producing crystalline gallosilicates having the following composition in terms of the mole ratios of the oxides:

• 0.9.+-.0.25M.sub.2 /.sub.n O:Ga.sub.2 O.sub.3 :xSiO.sub.2 :yH.sub.2 O.zQ
• wherein M is at least one cation having a valence n, x is at least 10, y/x is from 0 to 30, Q is a template used in the synthesis of the gallosilicate and z/x is 0-20, wherein the gallosilicate in the organic free hydrogen-form has an X-ray diffraction pattern substantially as set forth in Table A of this specification,
• comprising freshly precipitating gallium hydroxide from a solution,
• dissolving the freshly precipitated gallium hydroxide in an aqueous alkali metal hydroxide solution,
• adding an organic or inorganic nitrogen base to the solution to form a mixture thereof,
• slowly adding a source of silica to the mixture of said freshly precipitated gallium hydroxide solution and the nitrogen base,
• mixing the solution until a homogeneous gel is formed, and
• crystallising the gel at a temperature above 70.degree. C. to obtain said crystalline gallosilicate.