Process for modifying the pore system of zeolite LZ-202
US5192727A · kind A · utility
7Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1991 |
| Grant date | Mar 9, 1993 |
| Priority date | — |
| Expiry date | Aug 19, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2229/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Zeolite LZ-202 and other zeolites synthesized in the absence of organic templating agents and having a crystal structure isotypic with the mineral mazzite are subjected to a three-step treatment to greatly increase their surface area, catalytic activity and adsorptive capacity for adsorbates having molecular dimensions as large as the SF.sub.6 molecule. The treatment steps involve an initial conventional NH.sub.4.sup.+ ion-exchange, steaming at temperatures in excess of 300.degree. C. and a low-pH NH.sub.4.sup.+ ion-exchange at pH values below 4.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.