Method for preparing metalloaluminophosphate (MEAPO) molecular sieve

Abstract

The present invention also relates to a method for preparing metalloaluminophosphate (MeAPO) molecular sieve said method comprising : a) forming a reaction mixture containing a texture influencing agent (TIA), an organic templating agent (TEMP), at least a reactive inorganic source of MeO2 insoluble in the TIA, reactive sources of Al2O 3 and P2O5, b) crystallizing the above reaction mixture thus formed until crystals of the metalloaluminophosphate are formed, c) recovering a solid reaction product, d) washing it with water to remove the TIA and e) calcinating it to remove the organic template.In a usual embodiment said reaction mixture has a composition expressed in terms of molar oxide ratios of: TEMP / Al2O3=0.3-5, more desirable 0.5-2 MeO2 / Al2O3= 0.005-2.0, more desirable 0.022-0.8 P2O5 / Al2O3=0.5-2, more desirable 0.8-1.2 TIA / Al2O3=3-30, more desirable 6-20. In a usual embodiment the metalloaluminophosphate (MeAPO) molecular sieves made with the above method have a lamellar crystal morphology having an empirical chemical composition on an anhydrous basis, after synthesis and calcination, expressed by the formula HxMeyAlzPkO2 wherein, y+z+k=1, x<=y, y has a value ranging from 0.0008 to 0.4 and more desirable from 0.005 to 0.18, z has a value ranging from 0.25 to 0.67 and more desirable from 0.38 to 0.55, k has a value ranging from 0.2 to 0.67 and more desirable from 0.36 to 0.54, said molecular sieve having predominantly a plate crystal morphology. In an advantageous embodiment the MeAPO made by the method of the invention have essentially a structure CHA or AEI or a mixture thereof. Preferably they have essentially the structure SAPO 18 or SAPO 34 or a mixture thereof. The present invention also relates to catalysts consisting of the above MeAPO molecular sieves madeby the method of the invention or comprising the above MeAPO molecular sieves made by the method of the invention.

Description

technical field [0001] The present invention relates to a process for the preparation of metalloaluminophosphate (MEAPO) molecular sieves. The metalloaluminophosphate molecular sieves of the present invention can be used as catalysts in a variety of processes including cracking, hydrocracking, isomerization, reforming, dewaxing, alkylation, transalkylation, conversion of methanol to light olefins . The limited supply and rising cost of crude oil has spurred research into alternative methods for producing hydrocarbon products. One such process is the conversion of oxygen-, halide- or sulfur-containing organic compounds into hydrocarbons and especially into light olefins (light olefins are C 2 ~C 4 olefins) or gasoline and aromatics. The focus on methanol-to-olefins (MTO) processes is based on the fact that oxygenates, especially methanol, can be obtained from coal, biomass, organic waste, or natural gas by producing synthesis gas, which is then processed to produce methanol...

AI Technical Summary

Problems solved by technology

[0017] In all of the above prior art, only templates and / or specific reaction conditions are used to influence the crystal structure of the material

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