US 9,714,174 B2 · Methods of controlling polymorphism in organic-free synthesis of Na-zeolites and zeolite crystals formed therefrom

Abstract

Methods of controlling crystal polymorphism in organic-free synthesis of Na-Zeolites and the zeolite crystals formed using those methods are provided. The methods disclosed herein create certain types of zeolite crystals more efficiently than other previously known methods. The methods also create certain types of zeolite crystals in a form and concentration not previously disclosed. The methods disclosed herein generally comprise using solutions with varying ratios of silicon (Si), aluminum (Al), hydroxide (OH), and water. Some implementations of the invention disclosed include efficient methods of producing nearly pure cancrinite (CAN), methods of obtaining sodalite in solutions with a high Si/Al ratio, and a method of forming thin, platelet-like ANA crystals with a width of less than about 1 μm and a length of at least about 3 μm.

Claims10

Dependent claims

A method of forming zeolite crystals having an ANA framework-type, comprising:

forming a zeolite growth solution comprising:
a Si/OH ratio of less than about 1;
and
a Si/AI ratio of between about 6 to 1 and about 15 to 1;
and
heating the zeolite growth solution to a temperature from about 180 degrees Celsius to about 220 degrees Celsius to form the zeolite crystals having an ANA framework-type.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/946,919Filed 19 Jul 2013 · us provisional application

Priority

19 Jul 2012

Published

US 2014/0050659 A120 Feb 2014

Granted

25 Jul 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

C01B 39/02
Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange…
B01J 29/70
Crystalline aluminosilicate zeolites; Isomorphous compounds thereof: of types characterised by their specific structure not provided for in groups…
C01B 39/46
Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction…:…
C01B 39/50
Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange…

Methods of controlling polymorphism in organic-free synthesis of Na-zeolites and zeolite crystals formed therefrom

Life of this patent

Methods of controlling polymorphism in organic-free synthesis of Na-zeolites and zeolite crystals formed therefrom

Life of this patent

Abstract

Claims10