Chabazite-containing molecular sieve, its synthesis and its...

Details Chabazite-containing molecular sieve, its synthesis and its... Chabazite-containing molecular sieve, its synthesis and its...

C - Chemistry, Metallurgy

01

B

C01B 39/00 (2006.01)

Patent

CA 2548315

A crystalline material substantially free of framework phosphorus and comprising a CHA framework type molecular sieve with stacking faults or at least one intergrown phase of a CHA framework type molecular sieve and an AEI framework type molecular sieve, wherein said material, in its calcined, anhydrous form, has a composition involving the molar relationship: (n)X2O3:YO2, wherein X is a trivalent element; Y is a tetravalent element; and n is from 0 to about 0.5. The material exhibits activity and selectivity in the conversion of methanol to lower olefins, especially ethylene and propylene.

L'invention concerne un matériau cristallin sensiblement dépourvu de phosphore cadre et comprenant un tamis moléculaire du type à cadre CHA avec défauts d'empilage ou au moins une phase imbriquée de tamis moléculaire du type à cadre CHA et un tamis moléculaire du type à cadre AEI. Ledit matériau, dans sa forme calcinée, anhydre, a une composition qui fait intervenir la relation molaire: (n)X¿2?O¿3?:YO¿2?, X étant un élément trivalent, Y étant un élément tétravalent et n étant compris entre 0 et environ 0,5. Le matériau assure une activité et une sélectivité dans la conversion du méthanol en oléfines inférieures, en particulier ethylène et propylène.

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