Mor framework-type molecular sieves, and methods of making and using the same
AssigneeBraskem America, Inc.
InventorsIshant Khurana, Dan Xie, Graham Gregorich, Richard Opfer
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Abstract
The present disclosure provides an MOR framework-type molecular sieve comprising a plurality of crystallites of a mordenite (MOR) framework-type zeolite and a structure-directing composition (SDC) present within the zeolite's pores. The crystallites may have an average crystal size of 50 nm or below. The structure-directing composition may include 2-pyrrolidone or its N-alkyl derivative and at least two different quaternary ammonium cations.
Claims21
An MOR framework-type molecular sieve, comprising:
- a plurality of crystallites of a mordenite (MOR) framework-type zeolite, wherein the crystallites have an average crystal size of 50 nm or below, as measured by X-ray powder diffraction;
- and
- a structure-directing composition (SDC) present within the zeolite's pore structures, wherein the structure-directing composition comprises (1) 2-pyrrolidone or its N-alkyl derivative, and (2) at least two different quaternary ammonium cations, each being represented by N+R1R2R3R4, wherein R1, R2, R3, and R4 are each independently an alkyl or aryl.
An MOR framework-type molecular sieve, comprising:
- a plurality of crystallites of a mordenite (MOR) framework-type zeolite, wherein the crystallites exhibit an X-ray powder diffraction having at least three peaks at the following 2θ diffraction angles:
- 6.4, 8.5, 9.6, 13.4, 13.8, 14.5, 15.1, and 19.5°2θ±0.2°2θ;
- and
- a structure-directing composition (SDC) present within the zeolite's pore structures, wherein the structure-directing composition comprises (1) 2-pyrrolidone or its N-alkyl derivative and (2) at least two different quaternary ammonium cations, each being represented by N+R1R2R3R4, wherein R1, R2, R3, and R4 are each independently an alkyl or aryl.
A method for preparing a molecular sieve having a MOR framework type, comprising:
- providing a mixture comprising:
- i. a zeolite of a FAU framework-type,
- ii. a source of hydroxide ions (OH−),
- iii. a source of alkali or alkaline earth metal ions (M),
- iv. a structure-directing composition (SDC) comprising (1) 2-pyrrolidone or its N-alkyl derivative, and (2) at least two different quaternary ammonium cations, each being represented by N+R1R2R3R4, wherein R1, R2, R3, and R4 are each independently an alkyl or aryl, and
- v. water;
- and
- subjecting the mixture to crystallization conditions sufficient to form a plurality of crystallites of an MOR framework-type zeolite having the structure-directing composition within the zeolite's pore structures.
15-17. (canceled)
23-26. (canceled)
Dependencies are inferred from the claim text.