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US 11,691,124 B2Granted
Acid-resistant catalyst supports and catalysts
AssigneeW.R. Grace & Co.-Conn.
InventorsStephen R Schmidt, Cristian Libanati
Life of this patent
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Abstract
A process for preparing a catalyst comprises coating substantial internal surfaces of porous inorganic powders with titanium oxide to form titanium oxide-coated inorganic powders. After the coating, an extrudate comprising the titanium oxide-coated inorganic powders is formed and calcined to form a catalyst support. Then, the catalyst support is impregnated with a solution containing one or more salts of metal selected from the group consisting of molybdenum, cobalt, and nickel.
Claims4
A catalyst support prepared by the process comprising:
- coating substantial internal surfaces of porous inorganic powders with titanium oxide to form titanium oxide-coated inorganic powders, wherein the coating of internal surfaces comprises:
- preparing a slurry of porous inorganic powders in water;
- introducing portions of a solution comprising a soluble titanium oxide precursor and optionally a chelating or complexing agent and a basic solution alternately in 2 or more portions of each type into the slurry to form a mixture slurry;
- and
- aging the mixture slurry at a pH of 4.5 to 7.0 for at least about 1 hour to form titanium oxide-coated inorganic powders,
- wherein a resultant pH of the mixture slurry is maintained in a range of about 3.5 to about 6 during a period of introducing the soluble titanium oxide precursor and the basic solution, a weight ratio of the total soluble titanium oxide precursor introduced into the mixture slurry (as titanium oxide) to the porous inorganic powders is in a range of about 0.1 to about 1.0, and
- wherein a Ti/Al ratio as measured by x-ray photoelectron spectroscopy of the titanium oxide-coated inorganic powders is less than about 4.5.
4 more elements
A catalyst support prepared by the process comprising:
- coating substantial internal surfaces of porous inorganic powders with titanium oxide to form titanium oxide-coated inorganic powders, wherein the coating of internal surfaces comprises:
- preparing an aqueous mixture slurry comprising porous inorganic powders, a soluble titanium oxide precursor, and optionally a chelating or complexing agent with a weight ratio of the soluble titanium oxide precursor (as titanium oxide) to the porous inorganic powders in a range of about 0.1 to about 1.0;
- introducing a basic solution to the mixture slurry to raise pH value of the mixture slurry to a resultant pH of between about 3.5 and about 6;
- and
- aging the mixture slurry at a pH of 4.5 to 7.0 for at least about 1 hour to form titanium oxide-coated inorganic powders,
- wherein a Ti/Al ratio as measured by x-ray photoelectron spectroscopy of the titanium oxide-coated inorganic powders is less than about 4.5.
3 more elements
A catalyst support prepared by the process comprising:
- coating substantial internal surfaces of porous inorganic powders with titanium oxide to form titanium oxide-coated inorganic powders, wherein the coating of internal surfaces comprises:
- preparing a slurry of porous inorganic powders in water;
- introducing a solution comprising a soluble titanium oxide precursor and optionally a chelating or complexing agent and a basic solution simultaneously into the slurry at a predetermined relative rate to form a mixture slurry;
- and
- aging the mixture slurry at a pH of 4.5 to 7.0 for at least about 1 hour to form titanium oxide-coated inorganic powders,
- wherein a resultant pH of the mixture slurry is maintained in a range of about 3.5 to about 6.0 during a period of introducing the soluble titanium oxide precursor and the basic solution, and
- a weight ratio of the total soluble titanium oxide precursor introduced into the mixture slurry (as titanium oxide) to the porous inorganic powders is in a range of about 0.1 to about 1.0,
- wherein a Ti/Al ratio as measured by x-ray photoelectron spectroscopy of the titanium oxide-coated inorganic powders is less than about 4.5.
5 more elements
A catalyst support prepared by the process comprising:
- coating substantial internal surfaces of porous inorganic powders with titanium oxide to form titanium oxide-coated inorganic powders, wherein the coating of internal surfaces comprises:
- impregnating with incipient wetness porous inorganic powders with a solution comprising a soluble titanium oxide precursor and optionally a chelating or complexing agent;
- treating the impregnated porous inorganic powders with a basic solution;
- and
- aging the treated porous inorganic powders at a pH of 4.5 to 7.0 for at least about 1 hour to form titanium oxide-coated inorganic powders,
- wherein a weight ratio of the soluble titanium oxide precursor (as titanium oxide) to the porous inorganic powders is in a range of about 0.1 to about 1.0,
- wherein a Ti/Al ratio as measured by x-ray photoelectron spectroscopy of the titanium oxide-coated inorganic powders is less than about 4.5.
4 more elements
Dependencies are inferred from the claim text.