Loading patent…
AssigneeDegussa-Huls AG
InventorsUlrich Göbel, Lutz Marc Ruwisch, Ralph Kiessling, Martin Foerster
Estimating the term…
A method for producing a nitrogen oxide storage material that contains at least one storage component in the form of particles of an oxide, carbonate or hydroxide of the elements magnesium, strontium, barium, lanthanum and cerium on a carrier material from the group consisting of doped cerium oxide, cerium/zirconium mixed oxide and aluminum oxide or mixtures of these. The method is carried out by suspending the support material in an aqueous solution of precursors of the storage components, this suspension is then introduced into a hot gas stream, the temperature of which is calculated so that, during a residence time of the suspension in the hot gas stream of less than one minute, the solvent of the suspension is evaporated out and the precursors of the storage components are thermally broken down and converted to the storage components before the storage material that forms in this way is separated from the stream of hot gases.
A method for producing a nitrogen oxide storage material, which contains at least one storage component in the form of particles of an oxide, carbonate or hydroxide of an element selected from the group consisting of magnesium, strontium, barium, lanthanum and cerium on a support material selected from the group consisting of doped cerium oxide, cerium/zirconium mixed oxide, aluminum oxide and mixtures of these, comprising suspending the support material in an aqueous solution of a precursor of the storage component and a solvent to form a suspension, introducing the suspension into a hot gas stream, the temperature of the hot gas stream is adjusted to between 700 and 1100° C. so that during a residence time of the suspension in the hot gas stream of less than one minute the solvent evaporates, thermally breaking down the precursor of the storage component and converting to the storage component before separating the storage material from the stream of hot gas.
Dependencies are inferred from the claim text.