Chabazite-type zeolite and method of manufacturing chabazite-type zeolite
US10407314B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2018 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | May 13, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process of manufacturing a chabazite-type zeolite is provided having high heat resistance without having a large crystal size. A catalyst is also provided that contains such a chabazite-type zeolite and exhibits high nitrogen oxide reduction properties, and in particular high nitrogen oxide reduction properties in low temperatures below 200° C., even after exposure to high temperature and high humidity. A chabazite-type zeolite is provided having a silica to alumina molar ratio of no less than 15, a silanol group to silicon molar ratio of no more than 1.6×10−2, an average crystal size of 0.5 μm to less than 1.5 μm, and a ratio of 50%-volume particle size to 10%-volume particle size of no more than 3.2. The chabazite-type zeolite preferably contains at least one of copper and iron.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.