CHABAZITE ZEOLITE WITH HIGH HYDROTHERMAL RESISTANCE AND METHOD FOR PRODUCING SAME

• US 20190330070A1
• Filed: 06/01/2017
• Published: 10/31/2019
• Est. Priority Date: 06/07/2016
• Status: Active Grant

• Current Assignee: JGC Catalysts and Chemicals Ltd. (JGC Holdings Corporation)
• Original Assignee: JGC Catalysts and Chemicals Ltd. (JGC Holdings Corporation)
• Inventors: YAMAGUCHI, Yoko, TSURUTA, Shunji, NAKASHIMA, Akira
• Granted Patent: US 10,751,705 B2
• Time in Patent Office: Days
• CPC Class Codes: B01J 2229/16 to increase the Si/Al ratio; Dealumination
• CPC Class Codes: B01J 2229/36 Steaming
• CPC Class Codes: B01J 29/7015 CHA-type, e.g. Chabazite, LZ-218
• CPC Class Codes: B01J 29/763 CHA-type, e.g. Chabazite, LZ-218
• CPC Class Codes: B01J 35/615 100-500 m2/g
• CPC Class Codes: B01J 35/633 less than 0.5 ml/g
• CPC Class Codes: B01J 37/10 in the presence of water, e.g. steam
• CPC Class Codes: C01B 39/026 After-treatment
• CPC Class Codes: C01B 39/46 Other types characterised by their X-ray diffraction pattern and their defined composition C01B39/023, C01B39/026, C01B39/06 take precedence
• CPC Class Codes: C01P 2002/04 Compounds with a limited amount of crystallinty, e.g. as indicated by a crystallinity index
• CPC Class Codes: C01P 2002/77 by unit-cell parameters, atom positions or structure diagrams
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/13 thermal stability thereof at high temperatures
• CPC Class Codes: C01P 2006/14 Pore volume

Abstract

[Problem] Chabazite zeolites have a problem of low hydrothermal resistance. [Solution] By steam treating a chabazite zeolite having a silica-alumina ratio and a crystallinity that are within certain ranges, a chabazite zeolite having a high crystallinity and a high hydrothermal resistance can be obtained.

Claims

1. A method of producing chabazite zeolite comprising:

steps (a) and (b);

(a) a step of preparing a precursor having features (1), (2), and (3);

(1) the precursor has a chabazite framework;

(2) 5≤

silica-alumina molar ratio; and

(3) 100%≤

crystallinity, and

(b) a step of steam-treating the precursor under conditions having features (4) and (5);

(4) 50%≤

moisture content; and

(5) 450°

C.≤

treatment temperature≤

800°

C.

2. A chabazite zeolite comprising features (1) to (4):

(1) the chabazite zeolite has a chabazite framework;

(2) the chabazite zeolite contains Si and Al;

(3) lattice constant≤

13.74 Å

; and

(4) 140%≤

crystallinity.