Lanthanum-stabilized alumina particulates

Details Lanthanum-stabilized alumina particulates Lanthanum-stabilized alumina particulates

1996-08-05

1998-02-17

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01F 702

Patent

active

057188793

ABSTRACT:
Heat-stable alumina particulates well suited as catalysts/catalyst supports, notably for the catalytic conversion of vehicular exhaust gases, contain a stabilizing amount of lanthanum values, optionally a costabilizing amount of neodymium values, and have a specific surface area of greater than 40 m.sup.2 /g after calcination at 1,200.degree. C. for 4 hours; these are produced by ripening/rehydrating an alumina powder at least partially into boehmite/pseudo-boehmite state in the presence of a stabilizing amount of at least one lanthanum compound, e.g, lanthanum nitrate, and, optionally, also at least one neodymium compound, the starting alumina powder being the product of rapid dehydration of at least one aluminum hydroxide and/or aluminum oxyhydroxide.

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