Multiple impregnation technique for the preparation of ex situ selectivated zeolite catalysts
US5403800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | May 28, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2529/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A ex situ selectivated catalytic molecular sieve for enhanced shape selective hydrocarbon conversions in which a catalytic molecular sieve is modified by being exposed to at least two selectivation sequences, each sequence including an impregnation of the molecular sieve with a selectivating agent and a subsequent calcination of the impregnated molecular sieve. The ex situ selectivation method is also described, including the use of aqueous carriers for the selecting agent. Also a method for in situ trim-selectivating the modified catalytic molecular sieve. Also, a method for moderate steaming of the selectivated molecular sieve. Also a method for in situ trim-selectivating the modified catalytic molecular sieve. Also described is the process for shape selective hydrocarbon conversion comprising contacting a hydrocarbon feedstream under conversion conditions with the selectivated molecular sieve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.