Coated composites of Al2O3—CeO2/ZrO2 and a method for their production
OwnerMarcos Schoneborn, Noelia Guillen-Hurtado +3inventors
InventorsMarcos Schoneborn, Noelia Guillen-Hurtado, Thomas Harmening, Dirk Niemeyer, Diane Howe
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Abstract
The present invention relates to a metal oxide coated composite comprising a core consisting of a mixture of a La stabilized Al2O3 phase and an Ce/Zr/RE2O3 mixed oxide phase, the core having a specific crystallinity, specific pore volume and a specific pore size distribution, and a method for the production of the metal oxide coated composite.
Claims15
A coated Al/Ce/Zr composite comprising a calcined Al/Ce/Zr core, the core consisting of two phases, a La stabilized Al2O3 phase and a Ce/Zr/Re2O3 mixed oxide phase, both phases forming a homogeneous mixture, the calcined Al/Ce/Zr core being characterized by having a pore volume above 0.2 ml/g (according to DIN 66133), and a pore size distribution having a maximum between 50 and 200 Å (according to DIN 661333), the core comprising a metal oxide coating wherein the metal oxide coating forms at least 1 to 50 wt, % of the coated Al/Ce/Zr composite and wherein the Al/Ce/Zr core in the coated composite is characterized by an intensity ratio between the characteristic reflection of gamma-alumina at 2θ≈67° and the characteristic reflection of Ce/Zr solid solution at 2θ≈29°, normalized by the Al2O3 weight % of equal to or larger than 1.
Dependencies are inferred from the claim text.