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US 8,895,795 B2Granted
Acid washed silica supported catalysts and their use in olefin metathesis
AssigneeUop LLC
InventorsMark A. Krawczyk, Kristoffer E. Popp, Christopher P. Nicholas, Jennifer F. Abrahamian
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Abstract
Acid washing of silica supports, used for supported tungsten catalysts, improves the activity of the resulting catalyst (i.e., its conversion level at a given temperature) for the metathesis of olefins, without compromising its selectivity to the desired conversion product(s). Exemplary catalysts and processes include those for the production of valuable light olefins such as propylene from a hydrocarbon feedstock comprising ethylene and butylene.
Claims13
An olefin metathesis process comprising:
- contacting a hydrocarbon feedstock with a catalyst comprising tungsten disposed on a support comprising silica that is acid washed, wherein the catalyst is acid washed with sulfuric acid, and wherein the acid concentration in the aqueous solution used for acid washing is greater than 0.05 molar, and wherein the support has an average pore diameter between 45 Å to 170 Å, and an average surface area between 250 m2/g to 600 m2/g,
- wherein the hydrocarbon feedstock comprises olefins including a first olefin and a second olefin having a carbon number of at least two greater than that of the first olefin, to produce a third olefin having an intermediate carbon number, and wherein the molar ratio of the first olefin to the second olefin is from about 0.5:1 to about 2:1.
Dependencies are inferred from the claim text.