Silica having titanium incorporated through use of peroxide
AssigneePhillips Petroleum Company
InventorMax P. McDaniel
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Abstract
A silica composition having a high concentration of titanium is produced by solubilizing a titanium compound by combining same with a peroxide such as hydrogen peroxide. In a preferred embodiment, the peroxide is combined with the acid typically used in producing a gel from the combination of a silicate solution and an acid although the solubilizing component can also be used to simply impregnate particulate silica. The resulting composition has a high titanium content and an unusual pore structure makes it ideally suited as a catalyst base. When contemplated as a catalyst base, chromium can simply be coprecipitated with the silica and titanium. The resulting catalyst is ideally suited for the polymerization of olefins under slurry conditions.
Claims20
A method comprising combining a titanium compound, a peroxide, and a mineral acid to form a first solution;
- thereafter combining said first solution with a second solution comprising an alkali metal silicate;
- allowing gellation to occur;
- aging for a time of at least one hour;
- washing to remove alkali metal ions;
- and
- removing water to produce a xerogel.
A method for producing a catalyst comprising combining a mineral acid, a titanium compound and a peroxide to form a solution;
- combining said solution with silica to form a treated silica composition, said composition containing in addition a chromium compound.
Dependencies are inferred from the claim text.