Catalyst containing phosphorus for converting oxygenates into olefins

A process for preparing a phosphorus-containing catalyst, comprising the steps of:

• (a) extruding a mixture comprising a zeolite having an MFI structure, having an Si/Al atomic ratio in the range from 85 to 125, and aluminum oxide, aluminum oxide hydrate or both as a binder to obtain an extrudate,
• (b) calcining the extrudate obtained from step (a),
• (c) treating the calcined extrudate obtained from step (b) with steam,
• (d) applying a phosphorus compound to the steam-treated extrudate from step (c) to obtain a phosphorus-containing extrudate, and
• (e) calcining the phosphorus-modified extrudate from step (d) thereby producing a phosphorus-containing catalyst,
• wherein the proportion by weight of phosphorus in the catalyst obtained after step (e) is 0.8% to 2.5% by weight, and wherein the binder present in the mixture extruded in step (a) is used in an amount in the range from 8% to 40% by weight, based on the total weight of zeolite used and binder, and
• wherein
• (i) both between the extrusion in step (a) and the calcination in step (b) and after the application of a phosphorus compound in step (d), there is no treatment with steam, and
• (ii) both before the treatment of the extrudate with steam in step (c) and after the calcination of the phosphorus-modified extrudate in step (e), there is no application of a phosphorus compound.