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AssigneeThe Dow Chemical Company
InventorsHoward W. Clark, Robert G. Bowman, Joseph J. Maj, Simon R. Bare, George E. Hartwell
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A process and catalyst for the direct oxidation of an olefin having three or more carbon atoms, such as propylene, by oxygen to an olefin oxide, such as propylene oxide. The process involves contacting the olefin with oxygen under reaction conditions in the presence of hydrogen and a catalyst. The catalyst comprises gold on a support of titanium dispersed on silica. The titanium phase is disorganized and substantially free of crystalline titanium dioxide, as determined by analytical methods, such as, high resolution transmission electron microscopy and Raman spectroscopy. Selectivity to olefin oxide is high at good conversions of the olefin. The time between catalyst regenerations is long, and the catalyst is readily regenerated.
A process of preparing an olefin oxide comprising contacting an olefin having at least three carbon atoms with oxygen in the presence of hydrogen and an optional diluent, and in the presence of a catalyst comprising gold on a support, wherein the support comprises titanium dispersed on silica, the titanium being present substantially in a disorganized phase.
A process of preparing propylene oxide comprising contacting in a gas phase propylene with oxygen in the presence of hydrogen and an optional diluent and in the presence of a catalyst containing gold having an average particle size between 12 .ANG. and 200 .ANG. on a support, the support comprising titanium dispersed on silica, the titanium being substantially in a disorganized phase and substantially free of crystalline titanium dioxide as determined by high resolution electron transmission microscopy, Raman spectroscopy, and/or ultraviolet-visible diffuse reflectance spectroscopy, the contacting being conducted at a temperature greater than 70.degree. C. and less than 225.degree. C.
A composition comprising gold on a support, wherein the composition excludes palladium, the support comprising titanium dispersed on silica wherein the titanium is substantially in a disorganized phase.
Dependencies are inferred from the claim text.