Highly heat resistant .beta.-zeolite and absorbent for automobile exhaust gas purification and adsorbent for automobile exhaust gas purification
US6294150A · kind A · utility
3Cited by
6References
7Claims
0Family size
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Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/27
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A highly heat-resistant and hydrothermal-resistant .beta.-zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 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 .beta.-zeolite. The .beta.-zeolite and the adsorbent can be produced reliably so as to have guaranteed properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.