Stabilized microporous crystalline material, the method of making the same, and the use for selective catalytic reduction of NOx
US9517458B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2012 |
| Grant date | Dec 13, 2016 |
| Priority date | — |
| Expiry date | Mar 27, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B39/46
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There is disclosed a microporous crystalline material having pore opening ranging from 3 to 5 Angstroms, where the material comprises a first metal chosen from alkali earth group, rare earth group, alkali group, or mixtures thereof, and a second metal chosen from iron, copper or mixtures thereof; and has a molar silica to alumina ratio (SAR) from 3 to 10. The microporous crystalline material disclosed herein may comprise a crystal structure having building units of double-6-rings (d6r) and pore opening of 8-rings as exemplified with framework types defined by the Structure Commission of the International Zeolite Association having structural codes of CHA, LEV, AEI, AFT, AFX, EAB, ERI, KFI, SAT, TSC, and SAV. There is also disclosed a method of selective catalytic reduction of nitrogen oxides in exhaust gas, comprising at least partially contacting the exhaust gases with an article comprising the disclosed microporous crystalline material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.