Hydrocarbon conversion process employing catalysts containing a molybdenum-exchanged crystalline aluminosilicate zeolite
AssigneeUnion Oil Company of California
InventorEric L. Moorehead
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Abstract
Molybdenum is ion exchanged into a crystalline aluminosilicate zeolite, replacing metals such as sodium, calcium, and potassium, by contacting the zeolite with an aqueous solution containing molybdenyl cations (i.e., MoO.sub.2.sup.2+) and having a pH below 7.0 but higher than that which would substantially affect the crystallinity of the zeolite. The resulting zeolite, when calcined or sulfided, is useful as a catalyst for hydrocarbon conversion reactions, particularly with respect to the hydrodealkylation of toluene to benzene and methane.
Claims36
In a process for dealkylating hydrocarbons, the improvement comprising contacting a hydrocarbon feedstock containing a component selected from the group consisting of toluene and alkylated naphthenes under dealkylating conditions with a catalyst comprising a molybdenum-containing zeolite prepared by calcining a crystalline aluminosilicate having at least some of its ion exchange capacity satisfied with cations containing molybdenum.
In a process for dealkylating hydrocarbons selected from the group consisting of toluene and alkylated naphthenes, the improvement comprising contacting said hydrocarbons under dealkylating conditions with a catalyst comprising a crystalline aluminosilicate zeolite prepared by the method comprising:
- (1) contacting a crystalline aluminosilicate zeolite having an ordered structure with an aqueous solution containing a precursor of MoO.sub.2.sup.+2 cations, said solution having sufficient of an organic base added thereto to maintain the pH of the solution below 7.0 but higher than that which would substantially affect the crystal structure of the zeolite, said contacting being under conditions sufficient to replace at least some of the cations in the zeolite with molybdenum-containing cations and increase the molybdenum-containing cation content of the zeolite, and
- (2) subsequently calcining the zeolite containing the molybdenum-containing cations in an oxygen-containing oxidizing atmosphere.
A hydrocarbon conversion process for upgrading hydrocarbons comprising contacting a hydrocarbon feedstock at an elevated temperature with a hydrocarbon conversion catalyst comprising a zeolite selected from the group consisting of calcined or sulfided crystalline aluminosilicate zeolites containing molybdenum-containing cations exchanged thereinto, said contacting being under conditions promoting the conversion of an acid catalyzed hydrocarbon conversion reaction.
A hydrocarbon conversion process for upgrading hydrocarbons comprising contacting a hydrocarbon feedstock at an elevated temperature with a hydrocarbon conversion catalyst in sulfided or calcined form, said catalyst containing a zeolite into which molybdenum-containing cations were introduced by ion exchange and said contacting being under conditions promoting the conversion of an acid catalyzed hydrocarbon conversion reaction.
Dependencies are inferred from the claim text.