Zeolite synthesis

In a method for the preparation of zeolite Nu-10 having the molar composition expressed by the formula:

• 0.5 to 1.5R.sub.2 O:Y.sub.2 O.sub.3 :at least 20XO.sub.2 b :0 to 4,000H.sub.2 O wherein R is a monovalent cation or 1/n of a cation of valency n, X is silicon and/or germanium, Y is one or more of aluminum, iron, chromium, vanadium, molybdenum, arsenic, antimony, manganese, gallium or boron, and H.sub.2 O is water of hydration additional to water notionally present when R is H, said zeolite having the X-ray pattern as set out in Table 1 in the specification, said method comprising reacting an aqueous mixture containing sources of at least one oxide XO.sub.2 and at least one oxide Y.sub.2 O.sub.3 ;
• the improvement wherein said mixture is free of organic compounds, the reaction mixture has the molar composition;
• XO.sub.2 /Y.sub.2 O.sub.3 =10 to 1500
• M.sup.1 OH/XO.sub.2 =10.sup.-8 to 1.0
• H.sub.2 O/XO.sub.2 =10 to 200
• M.sup.2 Z/XO.sub.2 =0 to 4.0
• wherein each M.sup.1 and M.sup.2 represents an alkali metal selected from the group consisting of sodium, potassium, rubidium and caesium, ammonium or hydrogen, X and Y have the meanings given above, Z represents an acid radical, the reaction is carried out at 130.degree. to 220.degree. C. and the composition of the reaction mixture and the reaction conditions are selected to produce said Nu-10.