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AssigneeMobil Oil Corporation
InventorsJeffrey S. Beck, David H. Olson, Sharon B. McCullen
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An 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 low volatility organic carriers for the selectivating agent. Also, a method for moderate steaming of the ex situ selectivated molecular sieve. Also a method for in situ trim-selectivating the ex situ selectivated catalytic molecular sieve. Also described is the process for shape selective hydrocarbon conversion comprising contacting a hydrocarbon feedstream under conversion conditions with the modified catalytic molecular sieve.
A method for modifying a catalytic molecular sieve for shape selective hydrocarbon conversions, comprising exposing the catalytic molecular sieve to at least two ex situ selectivation sequences, wherein the ex situ selectivation sequence includes the steps of contacting the catalytic molecular sieve with a silicon-containing selectivating agent selected from the group consisting of silicones and silicone polymers, wherein said silicon-containing selectivating agent is present in an organic carrier, and subsequently calcining the catalytic molecular sieve.
A modified catalytic molecular sieve for shape selective hydrocarbon conversion, which has been pre-selectivated by exposing a catalytic molecular sieve to at least two ex situ selectivation sequences, wherein the ex situ selectivation sequence includes the steps of contacting the catalytic molecular sieve with a silicon-containing selectivating agent selected from the group consisting of silicones and silicone polymers, wherein said silicon-containing selectivating agent is present in an organic carrier, and subsequently calcining the catalytic molecular sieve.
Dependencies are inferred from the claim text.