Process for preparing EU-1 zeolite

A process for preparing an EU-1 zeolite having a XO2/Y2O3 ratio in the range 10 to 100, comprising:

• a) mixing, in an aqueous medium, at least one source of at least one oxide XO2, X being silicon and/or germanium, at least one source of at least one oxide Y2O3, Y being aluminium, iron, gallium and boron, and at least one organic template Q, said reaction mixture having the following molar composition:
• XO2/Y2O3
• 10 to 100;
• OH−/XO2
• 0.1 to 6.0;
• (M+ + Q)/Y2O3
• 0.5 to 100;
• Q/(M+ + Q)
• 0.1 to 1;
• H2O/XO2
• 1 to 100;
• M+/XO2
• 0 to 0.15;
• where M+represents an alkali metal or ammonium monovalent cation;
• b) drying the reaction mixture derived from a) at a temperature of less than 200° C.;
• c) hydrothermal treatment of the dried reaction mixture derived from b) in an autoclave, said dried reaction mixture not being in contact with a liquid phase at the bottom of the autoclave, whereby EU-1 zeolite is produced.