Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1990-03-05
1992-02-18
Lewis, Michael
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
423 71, 423115, 423625, 423628, 502349, 501105, C01G 2502, C01F 702, B01J 2100
Patent
active
050892479
ABSTRACT:
Zirconium-doped pseudoboehmite with the following properties: zirconium content of 0.5 to 10 mol % relative to Al water content of 20 to 35 weight percent total of the anionic impurities less than 0.5 weight percent. It is synthesized by a process wherein zirconium salt is added in calculated quantity to an aqueous aluminum sulfate solution, the resulting mixture is fed simultaneously with a sodium aluminate liquor into a water pool having a temperature of 50.degree. to 100.degree. C., thereby precipitating zirconium-doped alumina gel while a pH of 3.5 to 8 is maintained, the pH of the suspension is adjusted after addition of the aluminum sulfate solution to 8.5 to 10.5 by further addition of sodium aluminate liquor, the suspension is digested if necessary at the pH of 8.5 to 10.5 and the temperature of 50.degree. to 100.degree. C. for a period of up to 24 hours, the formed pseudoboehmite crystals are filtered off, the filter cake is redispersed with water and the suspension is sprayed-dried. By calcining at 700.degree. to 1100.degree. C., preferably at 850.degree. to 950.degree. C., the pseudoboehmite is further processed to zirconium-doped gamma-alumina suitable for automobile exhaust catalysts.
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Kleinschmit Peter
Liu Anh T.
Schwarz Rudolf
Bos Steven
Degussa - Aktiengesellschaft
Lewis Michael
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