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A method of preparing a modified catalytic molecular sieve for enhanced shape selective hydrocarbon conversions in which a catalytic molecular sieve is modified by being exposed to at least one ex situ selectivation sequence, each sequence including an impregnation of the molecular sieve with a sele

A method of preparing a modified catalytic molecular sieve for enhanced shape selective hydrocarbon conversions in which a catalytic molecular sieve is modified by being exposed to at least one ex situ selectivation sequence, each sequence including an impregnation of the molecular sieve with a selectivating agent in an aqueous emulsion and a subsequent calcination of the impregnated molecular sieve. The selectivating agent compositions for the ex situ selectivation method are also described, including the selectivating agents, the surfactants, and the aqueous components. 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 modified catalytic molecular sieve modified by this method. Also described is a process for shape selective hydrocarbon conversion comprising contacting a hydrocarbon feedstream under conversion conditions with the modified catalytic molecular sieve.

대표청구항 ▼

[ What is claimed is:] [1.] 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 each ex situ selectivation sequence includes the steps of:a) contacti

[ What is claimed is:] [1.] 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 each ex situ selectivation sequence includes the steps of:a) contacting an intermediate pore catalytic molecular sieve with an aqueous emulsion comprising a silicon-containing selectivating agent, a surfactant, and an aqueous component; andb) calcining the contacted catalytic molecular sieve.