Catalytic cracking process using ammonia-stable zeolite catalyst
US4036739A · kind A · utility
23Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1975 |
| Grant date | Jul 19, 1977 |
| Priority date | — |
| Expiry date | Jul 22, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2229/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Highly active, hydrothermally stable and ammonia-stable Y zeolite compositions are disclosed, which compositions are useful as adsorbents, hydrocarbon conversion catalysts, and as acidic supports for catalytic metals. The stabilized Y zeolite composition is prepared from a sodium Y zeolite by a novel sequence of: (1) partial exchange of ammonium ions for sodium ions, (2) steam calcination under controlled conditions of time, temperature and steam partial pressure, and (3) further ion exchange of ammonium ions for sodium ions to reduce the final Na.sub.2 O content to below about one weight-percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.