Supported lewis acid catalysts for hydrocarbon conversion reactions
AssigneeExxon Chemical Patents Inc.
InventorsFrank J. Chen, Christophe Le Deore, Roger Spitz, Alan Guyot
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Abstract
A supported Lewis acid catalyst system for catalyzing hydrocarbon conversion reactions including cationic polymerization, alkylation, isomerization and cracking reactions is disclosed, wherein the catalyst system comprises an inorganic oxide support having immobilized thereon at least one relatively strong Lewis acid and at least one relatively weak Lewis acid.
Claims7
A supported Lewis acid catalyst that is free from added titanium-, vanadium-, hafnium- and zirconium-containing Lewis acids and is effective for catalyzing hydrocarbon conversion reactions, which comprises an inorganic oxide substrate having immobilized thereon a catalytically effective amount of at least one strong Lewis acid selected from the group consisting of the halides, alkyl halides and alkyl compound of aluminum and the halides of boron and at least one weak Lewis acid selected from the group consisting of the halides, alkyl halides and alkyl compounds of magnesium, iron, tin and zinc and wherein the molar ratio of strong Lewis acid to weak Lewis acid is in the range of from about 100:1 to about 1:100.
A process for preparing a supported Lewis acid cationic polymerization and alkylation catalyst system, which comprises the steps of:
- (a) providing an inorganic, hydroxyl group-containing support;
- (b) contacting said support with a strong Lewis acid, other than titanium-, vanadium-, hafnium- and zirconium-containing Lewis acids, and selected from the group consisting of the halides, alkyl halides and alkyl compounds of aluminum and the halides of boron, under conditions effective to react said strong Lewis acid with a first portion of the hydroxyl groups contained on said support;
- (c) either before or after step (b), contacting said support with a weak Lewis acid, other than titanium-, vanadium-, hafnium- and zirconium-containing Lewis acids, and selected from the group consisting of the halides, alkyl halides and alkyl compounds of magnesium, iron, tin, and zinc under conditions effective to react said weak Lewis acid with a second portion of the hydroxyl groups contained on said support;
- and
- (d) after steps (b) and (c), optionally contacting said support with a halogenating agent;
- and
- wherein the molar ratio of strong Lewis acid to weak Lewis acid is in the range of from about 100:1 to about 1:100.
Dependencies are inferred from the claim text.