Process for obtaining modified molecular sieves

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The invention covers a process for obtaining an alkaline earth or rare earth metal-P-modified molecular sieve (M-P-modified molecular sieve) comprising the following steps : a). selecting at least one molecular sieve selected from one of : a P-modified molecular sieve which contains at least 0.3 wt % of P obtained by dealuminating a molecular sieve in a steaming step, followed by a leaching step using an acid solution containing a source of Pa molecular sieve which is modified with P during step b) by dealuminating the molecular sieve in a steaming step, followed by a leaching step using an acid solution containing a source of P thereby introducing at least 0.3 wt % of Pb). contacting said molecular sieve with an alkaline earth or rare earth metal-containing compound (M-containing compound) to introduce at least 0.05 wt % of the alkaline earth or rare earth metal to the molecular sieve. The invention also covers a catalyst composite comprising : a). at least 10 wt % of a M-P-modified molecular sieve comprising at least 0.05% by weight of an alkaline earth or rare earth metal (M) and at least 0.3 wt % of P, b). optionally metal phosphate, c). optionally matrix material, andd). optionally binder. The catalyst of the invention can also be used in a process for making an olefin product from an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock wherein said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock is contacted in the XTO reactor with the catalyst composite according to the invention under conditions effective to convert the oxygen-containing, halogenide-containing or sulphur-containing organic feedstock to olefin products (the XTO reactor effluent). The catalyst composite of the invention can also be used in addition or alternatively in an OCP process.