Metal oxide sols
AssigneeJohnson Matthey PLC
InventorMark Robert Feaviour
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Abstract
A sol includes metal oxide nanoparticles dispersed in an aqueous liquid, and further includes stabilizer ions. The metal oxide particles include one or more metals selected from a first group consisting of cerium, zirconium, iron, manganese and titanium, and one or more metals selected from a second group consisting of platinum, palladium, rhodium, ruthenium, iridium and osmium. The sols can be used to deposit catalytic coatings onto catalyst substrates, including substrates with narrow channels (i.e. channels with a diameter of less than 500 μm).
Claims13
A sol comprising metal oxide nanoparticles dispersed in an aqueous liquid, wherein each metal oxide nanoparticle comprises one or more metals selected from a first group consisting of cerium, zirconium, iron, manganese and titanium, and one or more metals selected from a second group consisting of platinum, palladium, rhodium, ruthenium, iridium and osmium, wherein the one or more metals from the first group are intimately mixed with the one or more metals from the second group, the sol further comprises stabilizer ions wherein the stabilizer ions are anions of mineral acids or anions of organic acids with a pKa (relative to water) of less than 8, and the concentration of metal oxide nanoparticles in the sol is at least 50 g/l.
Dependencies are inferred from the claim text.