Composition based on zirconium oxides, praseodymium, lanthanum or neodymium, method for the preparation and use thereof in a catalytic system

摘要

The composition is based on zirconium oxide and at least one additive selected from zirconium oxide and at least one additive chosen from praseodymium, lanthanum or neodymium oxides, has a specific surface of at least 29 m 2/g after calcination at 1000° C. during a period of 10 hours and is obtained by a method wherein a mixture of zirconium compounds and additive is precipitated with a base; the medium thus obtained, containing a precipitate, is heated and a compound chosen from anionic surfactants, non-ionic surfactants, polyethylene glycols, carboxylic acids and the salts thereof and surfactants such as the ethoxylates of caroboxymethyl fatty alcohols is added to the compound and the precipitate is calcinated; the composition can be used as a catalyst.

主权项

1. A calcined composition consisting of zirconium oxide and at least one additive, the at least one additive being selected from the group consisting of oxides of praseodymium, lanthanum and neodymium, the composition having mesopores between 10 nm and 500 nm in diameter, the mesopores being present in an amount of at least 30% of the total pore volume, the composition being capable of having a specific surface area of at least 29 m2/g after calcining for 10 hours at 1000° C.