초록 ▼

A process for the preparation of a TiO2-containing catalyst or catalyst support which is stable to high temperatures is described. In this process an aqueous Ti-containing solution having a concentration of dissolved Ti equivalent to 10 to 250 g TiO2 per liter of solution is added

A process for the preparation of a TiO2-containing catalyst or catalyst support which is stable to high temperatures is described. In this process an aqueous Ti-containing solution having a concentration of dissolved Ti equivalent to 10 to 250 g TiO2 per liter of solution is added to a suspension of not more than 10 wt. % strength of a finely disperse inorganic support material in water, the inorganic support material having a specific surface area, measured by the BET method, of >20 m2/g and any primary particle agglomerates present having a particle size of d50<10 μm, preferably <5 μm, the rate of addition of the Ti-containing solution to the suspension being chosen such that an addition equivalent to 0.05 g TiO2 per m2 of support surface and hour is not exceeded, the TiO2 is precipitated on the inorganic support and the product obtained is filtered, washed and calcined. Alternatively, the TiO2-containing catalysts or catalyst supports which are stable to high temperatures can be prepared by a process in which 1. hydrated precursors of one or more metal oxides or semi-metal oxides and 2. hydrated titanium oxide are rapidly precipitated from aqueous solution.

대표청구항 ▼

The invention claimed is: 1. A process for the preparation of a TiO2-containing catalyst or catalyst support which is stable to high temperatures, comprising: adding an aqueous Ti-containing solution having dissolved Ti content equivalent to 10 to 250 g TiO2 per liter of solution to an aqueous susp

The invention claimed is: 1. A process for the preparation of a TiO2-containing catalyst or catalyst support which is stable to high temperatures, comprising: adding an aqueous Ti-containing solution having dissolved Ti content equivalent to 10 to 250 g TiO2 per liter of solution to an aqueous suspension of not more than 10 wt. % of a dispersed inorganic support material to form a product mixture; wherein the inorganic support material has a specific surface area, measured by the BET method, of >20 m2/g and any agglomerates thereof have a particle size of d50<10 μm; wherein the Ti-containing solution is added to said suspension at a rate such that not more than the equivalent of 0.05 g TiO2 per m2 of support surface an hour is added and the TiO2 is precipitated as hydrated titanium oxide on the inorganic support, filtering the product mixture to form a filtered product; washing the filtered product to form a washed product; and calcining the washed product or introducing into an autoclave together with water and kept at temperature of >100° C. for a period of one hour to 5 days the washed product to yield the TiO2-containing catalyst or catalyst support. 2. The process according to claim 1, wherein any agglomerates of the inorganic support material which are present have a particle size of dso<5 μm. 3. The process according to claim 2, wherein the aqueous suspension comprises a dilute acid, a concentrated acid, or an alkali. 4. The process according to claim 2, wherein the washed product is introducing into an autoclave together with water and kept at temperature of >100° C. for a period of one hour to 5 days to yield the TiO2-containing catalyst or catalyst support. 5. The process according to claim 1, wherein the aqueous suspension comprises a dilute acid, a concentrated acid, or an alkali. 6. The process according to claim 5, wherein the washed product is introducing into an autoclave together with water and kept at temperature of >100° C. for a period of one hour to 5 days to yield the TiO2-containing catalyst or catalyst support. 7. The process according to claim 1, wherein the washed product is introducing into an autoclave together with water and kept at temperature of >100° C. for a period of one hour to 5 days to yield the TiO2-containing catalyst or catalyst support. 8. The process according to claim 1, wherein said aqueous Ti-containing solution comprises titanyl sulfate or titanium sulfate. 9. The process according to claim 1, wherein the concentration of dissolved Ti in the Ti-containing solution is equivalent to 10 to 200 g TiO2 per liter of solution. 10. The process according to claim 9, wherein the concentration of dissolved Ti in the Ti-containing solution is equivalent to 50 to 180 g TiO2 per liter of solution. 11. The process according to claim 10, wherein the washed product precipitation mixture is introduced the mixture into an autoclave together with water and kept at temperatures of >100° C. for a period of one hour to 5 days. 12. The process according to claim 1, wherein the concentration of inorganic support material in the suspension of the finely disperse support material is 0.2 to 8 wt. %. 13. The process according to claim 12, wherein the concentration of inorganic support material in the suspension of the finely disperse support material is 0.5 to 5 wt. %. 14. The method of claim 1, wherein the inorganic support material comprises aluminum oxide. 15. The method of claim 1, wherein the inorganic support material comprises silicon dioxide. 16. A process for the preparation of a TiO2-containing catalyst or catalyst support which is stable to high temperatures, comprising: adding an aqueous Ti-containing solution having a concentration dissolved Ti equivalent to 10 to 250 g TiO2 per liter of solution to an aqueous suspension of not more than 10 wt. % of a dispersed inorganic support material wherein the inorganic support material has a specific surface area, measured by the BET method, of >20 m2/g and any agglomerates thereof have a particle size of d50<10 μm; wherein the Ti-containing solution is added to said suspension at a rate such that not more than the equivalent of 0.05 g TiO2 per m2 of support surface an hour is added and the TiO2 is precipitated as hydrated titanium oxide on the inorganic support, introducing hydrated titanium oxide on the inorganic support the into an autoclave together with water and at temperature of >100° C. for a time period of one hour to 5 days to form an autoclaved product; filtering the product; and washing the filtered autoclaved product to form a filtered product. 17. The method of claim 16, wherein the inorganic support material comprises aluminum oxide. 18. The method of claim 16, wherein the inorganic support material comprises silicon dioxide.