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AssigneeDow Global Technologies LLC
InventorsRobert G. Bowman, Howard W. Clark, Alex Kuperman, George E. Hartwell, Garmt R. Meima
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A process and catalysts 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 under reaction conditions with oxygen in the presence of hydrogen and a catalyst. The catalyst contains silver and titanium, optionally gold, and optionally, at least one promoter element selected from Group 1, Group 2, zinc, cadmium, the lanthanide rare earths, and the actinide elements. Suitable supports include titanium dioxide, titanium dioxide on silica, titanosilicates, promoter metal titanates, titanium dispersed on silica and promoter metal silicates.
A catalyst composition comprising a titanium-containing support, silver, and at least one promoter element selected from the group consisting of zinc, cadmium, the lanthanide rare earths, the actinide elements, and combinations thereof, and combinations of at least one of the aforementioned elements with Group 1 and/or Group 2 elements.
A process of regenerating a, deactivated catalyst composition comprising titanium, silver, and optionally, a promoter metal, the process comprising heating the deactivated catalyst at a temperature between 150° C. and 500° C. in the presence of a regeneration gas comprising oxygen, water, or a mixture of oxygen and water, the regeneration gas further optionally containing an inert gas, under regeneration conditions sufficient to regenerate, at least in part, the deactivated catalyst.
Dependencies are inferred from the claim text.