ZEOLITE COMPOSITIONS AND METHODS FOR TAILORING ZEOLITE CRYSTAL HABITS WITH GROWTH MODIFIERS

摘要

Embodiments of the invention generally provide compositions of crystalline zeolite materials with tailored crystal habits and the methods for forming such crystalline zeolite materials. The methods for forming the crystalline zeolite materials include binding one or more zeolite growth modifiers (ZGMs) to the surface of a zeolite crystal, which results in the modification of crystal growth rates along different crystallographic directions, leading to the formation of zeolites having a tailored crystal habit. The improved properties enabled by the tailored crystal habit include a minimized crystal thickness, a shortened internal diffusion pathlength, and a greater step density as compared to a zeolite having the native crystal habit prepared by traditional processes. The tailored crystal habit provides the crystalline zeolite materials with an aspect ratio of about 4 or greater and crystal surfaces having a step density of about 25 steps/μm2 or greater.

主权项

1. A method for forming a zeolite material, comprising:
combining at least one framework source precursor, an adamantane structure directing agent, an organic zeolite growth modifier, and a solvent to form a synthesis mixture; and maintaining the synthesis mixture at a predetermined temperature for a predetermined time to form a plurality of zeolite crystals within a suspension during a synthesis process, wherein each of the zeolite crystals has:
a crystalline zeolite material having a single crystal structure;an upper surface of the crystalline zeolite material extending substantially parallel to a lower surface of the crystalline zeolite material;a length of the upper surface within a range from about 10 nm to about 50 μm;a width of the upper surface within a range from about 10 nm to about 50 μm;a plurality of side surfaces extending between the upper and lower surfaces; anda thickness of the crystalline zeolite material extending substantially perpendicular between the upper and lower surfaces.