Back to results
US 4,045,372 AGranted
Control of physical properties of alumina extrudates
AssigneeW. R. Grace & Co.
InventorsJohn Lawrence Warthen, Warren Stanley Briggs, Marvin Vernon Paggen
Life of this patent
Estimating the term…
Abstract
A process for preparing extrudates of alumina monohydrate having densities, surface areas and pore volumes within a predetermined range by mixing the alumina with a sufficient quantity of water to prepare an extrudable product and aging this product for a period of 1/2 to 6 hours. The alumina is then extruded and the extrudates dried using conventional techniques. The alumina is primarily used as a base for auto exhaust conversion catalysts.
Claims5
A process for preparing an auto exhaust conversion catalyst which consists essentially of the steps of:
- a. preparing an alpha alumina monohydrate in the 10 to 150 micron size range,
- b. adding a sufficient quantity of water to form an extrudable paste,
- c. aging said paste at ambient temperatures for 0.5 to 6 hours,
- d. extruding the alumina to form extrudates,
- e. drying and calcining the extrudates,
- f. contacting the extrudates with solutions of salts of metals having activity for conversion of the noxious components of exhaust gases to innocuous entities,
- g. drying, calcining and recovering the product.
4 more elements
Dependencies are inferred from the claim text.