A method of preparing a catalyst comprising a) contacting (i) a silica-support, (ii) an oxotitanium compound, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media having from about 1 wt. % to about 99 wt. %
A method of preparing a catalyst comprising a) contacting (i) a silica-support, (ii) an oxotitanium compound, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media having from about 1 wt. % to about 99 wt. % water; b) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst. A method of preparing a catalyst comprising contacting a hydrated support material comprising silica with a chromium-containing compound to form a first aqueous mixture comprising a chrominated support; contacting the first aqueous mixture comprising a chrominated support with a solution comprising (i) a solvent and (ii) an oxotitanium compound to form a second aqueous mixture comprising a pre-catalyst; and thermally treating the pre-catalyst to form the catalyst.
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1. A method of preparing a catalyst comprising: a) contacting (i) a silica-support, (ii) an oxotitanium compound, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media wherein the reaction media comprises fro
1. A method of preparing a catalyst comprising: a) contacting (i) a silica-support, (ii) an oxotitanium compound, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media wherein the reaction media comprises from about 1 wt. % to about 20 wt. % water; andb) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst. 2. The method of claim 1 wherein the reaction media comprises a liquid associated with the silica-support, a liquid associated with the oxotitanium compound, a liquid associated with the chromium-containing compound, and, when present, the solvent. 3. The method of claim 1 wherein the silica-support is characterized by a surface area of from about 100 m2/gram to about 1000 m2/gram and a pore volume of greater than about 1.0 cm3/gram. 4. The method of claim 1 wherein the chromium-containing compound comprises chromium trioxide, chromium acetate, chromium nitrate, tertiary butyl chromate, a diarene chromium (0) compound, biscyclopentadienyl chromium(II), chromium (III) acetylacetonate, or combinations thereof. 5. The method of claim 1 wherein an amount of chromium present in the catalyst ranges from about 0.01% to about 10% by weight of the catalyst and an amount of titanium present in the catalyst ranges from about 0.01% to about 10% by weight of the catalyst. 6. The method of claim 1 wherein the reaction mixture excludes a titanium tetraalkoxide. 7. A method of preparing a catalyst comprising: a) contacting (i) a silica-support, (ii) an oxotitanium compound characterized by a general formula R1R2TiO wherein R1 and R2 are each independently a carboxylate, a dicarboxylate, a diketonate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media having from about 1 wt. % to about 99 wt. % water; andb) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst. 8. The method of claim 7 wherein R1 and R2 are each independently formate, acetate, propionate, ammonium oxalate, ammonium malonate, ammonium fumarate, or ammonium malate. 9. The method of claim 7 wherein R1 and R2 are each independently unsubstituted 2,4-pentadionate or substituted 2,4-pentadionate. 10. A method of preparing a polymer comprising contacting a catalyst prepared by the method of claim 1 with an ethylene monomer under conditions suitable for formation of an ethylene polymer; and recovering the polymer. 11. The method of claim 10 wherein the polymer has a high load melt index of from about 10 g/10 min and to about 60 g/10 min, a polydispersity index of greater than about 15 and a shear response of less than about 60. 12. The method of claim 10 wherein the polymer has a high load melt index of from about 10 g/10 min to about 60 g/10 min, a polydispersity index of greater than about 15 and a shear response of less than about 45. 13. A method of preparing a catalyst comprising: contacting a hydrated support material comprising silica with a chromium-containing compound to form a first aqueous mixture comprising a chrominated support;contacting the first aqueous mixture comprising a chrominated support with a solution comprising (i) a solvent and (ii) an oxotitanium compound to form a second aqueous mixture comprising a pre-catalyst, wherein the oxotitanium compound is characterized by a general formula R1R2TiO wherein R1 and R2 are each independently a carboxylate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof; andthermally treating the pre-catalyst to form the catalyst. 14. The method of claim 13 wherein the first aqueous mixture comprises a liquid associated with the hydrated support material comprising silica and a liquid associated with the chromium-containing compound and wherein the second aqueous mixture comprises a liquid associated with the hydrated support material comprising silica, a liquid associated with the chromium-containing compound, a liquid associated with the oxotitanium compound, and the solvent. 15. The method of claim 13 wherein an amount of water present in the first or second aqueous mixture is in a range of from about 1 wt. % to about 50 wt. %. 16. The method of claim 13 wherein the chromium-containing compound comprises chromium trioxide, chromium acetate, chromium nitrate, tertiary butyl chromate, a diarene chromium (0) compound, biscyclopentadienyl chromium(II), chromium (III) acetylacetonate, or combinations thereof. 17. The method of claim 13 wherein R1 and R2 are each independently formate, acetate, propionate, ammonium oxalate, ammonium malonate, ammonium fumarate, or ammonium malate. 18. The method of claim 13 wherein R1 and R2 are each independently unsubstituted 2,4-pentadionate or substituted 2,4-pentadionate. 19. A method of preparing a catalyst comprising: contacting a hydrated support material comprising silica with an oxotitanium compound to form a first aqueous mixture comprising a titanated support and a first reaction media wherein the first reaction media comprises from about 1 wt. % to about 20 wt. % water;contacting the first aqueous mixture comprising a titanated support with a chromium-containing compound to form a second aqueous mixture comprising a pre-catalyst and a second reaction media wherein the second reaction media comprises from about 1 wt. % to about 20 wt. % water; andthermally treating the pre-catalyst to form the catalyst. 20. A method of preparing a catalyst comprising: a) contacting (i) a silica support material comprising from about 0.1 wt. % to about 20 wt. % water, (ii) a solution comprising (1) a 2,4-pentadionate oxotitanium compound, (2) a solvent and (3) from about 0.1 wt. % to about 80 wt. % water based on the total weight of the solution and (iii) a chromium-containing compound to form a pre-catalyst wherein liquid present in (i), (ii), and (iii) comprise a reaction media; andb) thermally treating the pre-catalyst by heating to a temperature in the range of from about 500° C. to about 900° C. for a time period of from about 3 hours to about 12 hours to form a catalyst. 21. The method of claim 20 wherein thermally treating the pre-catalyst produces emission products comprising less than about 2 wt. % hydrocarbons based on a total weight of the emission products. 22. A pre-catalyst composition comprising: (i) a silica-support, (ii) an oxotitanium compound characterized by the general formula R1R2TiO wherein R1 and R2 are each independently a carboxylate, a dicarboxylate, a diketonate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof, and (iii) a chromium-containing compound. 23. The composition of claim 22 wherein titanium is present in an amount of from about 0.5 wt. % to about 10 wt. % and chromium is present in an amount of from about 0.2 wt. % to about 2 wt. % based on the total weight of the composition. 24. The composition of claim 22 wherein the silica support is characterized by a surface area of greater than about 250 m2/g and a pore volume of greater than about 0.9 cm3/g. 25. A pre-catalyst prepared by a process comprising contacting (i) a silica-support, (ii) an oxotitanium compound characterized by a general formula R1R2TiO wherein R1 and R2 are each independently a carboxylate, a dicarboxylate, a diketonate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising the pre-catalyst and a reaction media having from about 1 wt. % to about 99 wt. % water. 26. The pre-catalyst of claim 25 wherein titanium is present in an amount of from about 0.5 wt. % to about 10 wt. % and chromium is present in an amount of from about 0.2 wt. % to about 2 wt. % based on the total weight of the composition and wherein the silica-support is characterized by a surface area of greater than about 250 m2/g and a pore volume greater than about 0.9 cm3/g. 27. The method of claim 19 wherein an amount of chromium present in the catalyst ranges from about 0.01% to about 10% by weight of the catalyst and an amount of titanium present in the catalyst ranges from about 0.01% to about 10% by weight of the catalyst. 28. The method of claim 19 wherein the oxotitanium compound is characterized by the general formula R1R2TiO wherein R1 and R2 are each independently a carboxylate, a dicarboxylate, a diketonate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof. 29. The method of claim 28 wherein R1 and R2 are each independently unsubstituted 2,4-pentadionate or substituted 2,4-pentadionate.
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