Process of Producing Zeolite-Based Catalysts for Converting Oxygenates to Lower Olefins

A process for producing a catalyst based on pentasil-type crystalline aluminosilicate, comprising the steps of:

• (a) treating hydrous aluminium oxide with an aqueous, acid-containing medium,
• (b) mixing the hydrous aluminium oxide treated with aqueous, acid-containing medium from step (a) with an H-zeolite with an average diameter of its primary crystallites between 0.01 μm and 0.1 μm to form a mixture, and
• (c) calcining the mixture obtained in step (b),
• wherein at least 95 vol.-% of particles of the hydrous aluminium oxide (relative to an average diameter) are smaller than or equal to 100 μm.