# US 6,294,150 B2 · Highly heat resistant β-zeolite and absorbent for automobile exhaust gas purification and adsorbent for automobile exhaust gas purification

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 6,294,150 B2
- Document ID: US6294150B2
- Status: Granted
- Kind: B2
- Application number: 09/188,005
- Filed: 1998-11-06
- Published: 2001-07-19
- Granted: 2001-09-25
- Earliest claimed: 1997-11-07
- Assignees: NGK Insulators, Ltd.; Masahiko Matsukata
- Inventors: Akira Takahashi; Toshihiro Tomita; Takuya Hiramatsu; Kenji Suzuki; Masahiko Matsukata
- Web page: https://patentgrep.com/patent/US6294150B2

## CPC

- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 53/92: of engine exhaust gases (exhaust {or silencing} apparatus {for internal combustion engines, machines or engines in general}, having means for purifying, {rendering innocuous} or otherwise treating exhaust gases F01N3/00)
- B01J 20/18: Synthetic zeolitic molecular sieves
- C01B 39/48: using at least one organic template directing agent
- B01D 2253/108: Zeolites
- B01D 2253/1085: characterized by a silicon-aluminium ratio
- B01D 2253/304: Linear dimensions, e.g. particle shape, diameter
- B01D 2258/01: Engine exhaust gases
- B01D 2259/4566: for use in transportation means
- Y10S 423/27: Beta, e.g. NU-2
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A highly heat-resistant and hydrothermal-resistant β-zeolite having a SiO2/Al2O3 ratio of 80 or more, which is constituted by primary particles having an average particle diameter of 30 nm or more or by primary particles having such a particle size distribution that the 10% particle diameter is 20 nm or more; and an adsorbent for automobile exhaust gas purification, using said β-zeolite. The β-zeolite and the adsorbent can be produced reliably so as to have guaranteed properties.

## Claims

### Claim 1

A β-zeolite powder having a SiO2/Al2O3 ratio of 80 or more, which consists essentially of primary particles giving a full width at half maximum of reflection peak for (h,k,l)=(3,0,2) of 2θ=0.5° or smaller when the X-ray diffraction pattern is obtained from an X-ray diffractometer using Cu=Kα as the X-ray source, said powder having a specific surface area retention of at least 59% after exposure to a steam-containing atmosphere having a temperature of 1000° C. for 4 hours, wherein said primary particles have at least one angular portion.

### Claim 2 (depends on 1)

The β-zeolite powder of claim 1, wherein the particle diameter of said primary particles is 100 nm or less, and the average particle diameter of said primary particles is 30 nm or more.

### Claim 3 (depends on 1)

The β-zeolite powder of claim 1, wherein the average particle diameter of said primary particles is 50 nm or more.

### Claim 4 (depends on 1)

The β-zeolite powder of claim 1, wherein the average particle diameter of said primary particles is 80 nm or more.

### Claim 5 (depends on 1)

The β-zeolite powder of claim 1, wherein the average particle size distribution such that the 10% particle diameter is 20 nm or more.

### Claim 6 (depends on 1)

The β-zeolite powder of claim 1, wherein said powder has a particle size distribution such that the 10% particle diameter is 40 nm or more.

### Claim 7 (depends on 1)

An adsorbent for automobile exhaust gas purification, comprising the β-zeolite powder according to claim 1.