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US 10,046,311 B2Granted
Post treated silver catalysts for epoxidation
AssigneeLyondell Chemical Technology, L.P.
InventorsSandor Nagy, Barbara Kimmich
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Abstract
The present disclosure generally relates to a silver-based epoxidation catalyst. In certain embodiments, a method is provided for modulating the reactivity of the silver-based epoxidation catalyst, comprising the catalyst being post-treated with at least two different salt solutions. In some embodiments, the treatment results in the deposition of one or more metals onto the surface of the catalyst. In further embodiments, method is also provided of using the silver catalyst to generate an epoxide from an olefin.
Claims10
A catalyst comprising:
- A) from about 45 to about 65 wt % of silver;
- B) from about 0.0 to about 5.0 wt % of a catalyst promoter selected from the group consisting of molybdenum, tungsten, zinc, nickel, copper, scandium and ytterbium;
- C) from 30 to about 90 wt % of a solid catalyst support selected from the group consisting of calcium titanate, magnesium titanate, barium titanate, strontium titanate, calcium carbonate, magnesium carbonate, barium carbonate, and strontium carbonate;
- and
- D) from about 0.1 to about 6.5 wt % of a salt mixture comprising from about 0.25 to about 2.5 wt % of a first salt selected from the group consisting of potassium nitrate, silver nitrate, gallium nitrate, barium nitrate, magnesium nitrate, strontium nitrate, and calcium nitrate and from about 0.1 to about 4.0 wt % of a second salt selected from potassium nitrate and potassium carbonate, and wherein the salt mixture coats the silver component of step A), the solid catalyst support, or the catalyst promoter.
2 more elements
Dependencies are inferred from the claim text.