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AssigneeMobil Oil Corporation
InventorsJeffrey S. Beck, Ralph M. Dessau, David H. Olson
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The present invention is a method of producing an ex situ selectivated catalytic molecular sieve for shape selective aromatic alkylation in which a catalytic molecular sieve having a reduced activity is modified by being exposed to at least two selectivation sequences, each sequence includes contacting the molecular sieve with a selectivating agent and subsequently calcining the contacted molecular sieve. The present invention is also a method of producing an ex situ selectivated catalytic molecular sieve for shape selective aromatic alkylation in which a catalytic molecular sieve is modified by being exposed to at least two selectivation sequences and then reduced in activity. The ex situ selectivated catalytic molecular sieves may optionally be further modified by in situ trim selectivation. The present invention is also a process for shape selective aromatic alkylation utilizing the modified molecular sieves.
A method for alkylation of aromatics which comprises:
A method for modifying a zeolite catalyst for shape selective aromatic alkylation which comprises:
A method for modifying a zeolite catalyst for shape selective aromatic alkylation which comprises:
A modified zeolite catalyst for shape selective aromatic alkylation which has been prepared by exposing a zeolite catalyst having a constraint index from about 1 to about 12 and having an alpha activity less than about 40, to at least two ex situ selectivation sequences, wherein said ex situ selectivation sequence includes the steps of:
A modified zeolite catalyst for shape selective aromatic alkylation which has been prepared by exposing a zeolite catalyst having a constraint index ranging from about 1 to about 12 to at least two ex situ selectivation sequences, wherein said ex situ selectivation sequence includes the steps of depositing on said zeolite catalyst a selectivating agent selected from the group consisting of silicones and silicone polymers and subsequently calcining said zeolite catalyst thereafter reducing the alpha activity of said selectivated zeolite catalyst to less than about 40 by ion exchange with an alkali metal.
Dependencies are inferred from the claim text.