Process for making a nitrogen oxide storage material and the material made by the said process
Production of a nitrogen oxide storage material comprises suspending the carrier material in an aqueous solution of precursors of the storage components; and introducing the suspension into a hot gas stream. Production of a nitrogen oxide storage material comprising a storage component in the form o...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | Production of a nitrogen oxide storage material comprises suspending the carrier material in an aqueous solution of precursors of the storage components; and introducing the suspension into a hot gas stream. Production of a nitrogen oxide storage material comprising a storage component in the form of particles of an oxide, carbonates or hydroxides of magnesium, strontium, barium, lanthanum and cerium on a carrier material made of cerium oxide, cerium/zirconium mixed oxide or aluminum oxide comprises suspending the carrier material in an aqueous solution of precursors of the storage components; and introducing the suspension into a hot gas stream whose temperature is measured so that during a dwell time of the suspension in the gas stream of a few minutes, the solvent of the suspension is evaporated and the precursors are thermally decomposed and converted into the storage components before the storage material is removed from the stream of hot gas. An Independent claim is also included for the storage material produced. |
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