Lightly branched higher olefin oligomerization with surface modified zeolite catalyst
AssigneeExxonMobil Research and Engineering Company
InventorsJane C. Cheng, Sal Miseo, Stuart L. Soled, John S. Buchanan, Jennifer S. Feeley
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Abstract
A substantially surface-deactivated catalyst composition that is stable at least to 300° C. The catalyst includes a zeolite catalyst (e.g., ZSM-22, ZSM-23, or ZSM-57) having active internal Brönsted acid sites and a surface-deactivating amount of a rare earth or yttrium oxide (e.g., chosen from lanthanum oxide or lanthanides oxide). This catalyst is preferably used in a process for producing a higher olefin by oligomerizing a light olefin, wherein the process includes contacting a light olefin under oligomerization conditions with the substantially surface-deactivated catalyst composition.
Claims12
A process for producing a higher olefin by oligomerizing a light olefin, said process comprising:
- contacting said light olefin under oligomerization conditions with a surface-deactivated catalyst composition comprising a zeolite catalyst having active internal Brönsted acid sites and containing a surface-deactivating amount of a rare earth or yttrium oxide wherein the amount ranges from greater than 0.84 wt % to less than 2.52 wt %.
A method of making a higher olefin from a light olefin containing stream, said method comprising:
- contacting the olefin containing stream with a surface-deactivated catalyst composition comprising a zeolite catalyst having active internal Brönsted acid sites and containing a surface-deactivating amount of a rare earth or yttrium oxide, wherein the amount ranges from greater than 0.84 wt % to less than 2.52 wt % thereby producing a higher olefin and a vent stream;
- separating said vent stream from said higher olefin;
- and
- contacting a portion of said separated vent stream with said surface-deactivated catalyst composition.
Dependencies are inferred from the claim text.