Process for preparing aqueous dispersion of ceria and resulting product
AssigneeUnited Kingdom Atomic Energy Authority
InventorJames L. Woodhead
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Abstract
The invention is concerned with the preparation of dispersions and particularly with the preparation of dispersions of cerium compounds. The invention provides for the preparation of an aqueous dispersion of ceria or hydrated ceria by a process which includes acid treatment of cerium IV hydroxide. Aqueous dispersions in accordance with the present invention find application in a number of technical fields (e.g. in the preparation of dense ceria coatings for use in catalysis and protective coatings, for example, for metals and alloys).
Claims12
A process for the preparation of an aqueous dispersion of ceria comprising forming a slurry of cerium IV hydroxide with water and an acid, the acid being capable of causing deaggregation of aggregated crystallites in the cerium IV hydroxide, heating the slurry for such a time and at such a temperature that the pH reaches a steady value, the quantity of acid in the slurry being such that the said steady value of pH is below 5.4, thereby to produce a conditioned slurry, separating liquid containing unreacted acid from said conditioned slurry to provide a slurry residue and admixing sufficient water with the resulting slurry residue to produce a sol of ceria.
Dependencies are inferred from the claim text.