Base-exchanged zeolite catalyst compositions with shape-selective metal function
A process is described for hydrogenolysis of hydrocarbons which comprises contacting a heated stream of paraffinic feedstock and hydrogen under hydrogenolysis conditions with a base-exchanged shape-selective crystalline zeolite catalyst composition. The catalyst is a zeolite having a silica/alumina ratio of at least 12, and having a shape-selective functioning intrazeolitic Group VIII metal content between about 0.01-10 weight percent. The catalyst is prepared by a process which comprises (1) subjecting as-synthesized crystalline zeolite material having a silica/alumina ratio of at least 12 to calcination at a temperature between about 200/sup 0/-600/sup 0/C for a period between about 1-48 hours; (2) contacting the calcined zeolite with an aqueous solution of Group VIII metal compound to exchange or sorb ionic Group VIII metal into the zeolite; (3) thermally treating the Group VIII metal-containing zeolite at a temperature in the range between about 150/sup 0/-550/sup 0/C; and (4) exchanging the zeolite substrate with Group IA metal cations to lower or essentially eliminate the base-exchangeable acidic content of the catalyst composition.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4699708
- OSTI ID:
- 5997286
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCINATION
CATALYSTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
HYDROGENATION
HYDROLYSIS
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
LYSIS
MATERIALS
METALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SOLVOLYSIS
SYNTHESIS
THERMOCHEMICAL PROCESSES
ZEOLITES