Improvements in or relating to the production of ceria
Patent
·
OSTI ID:4323996
CeO/sub 2/ has usually been prepared by calcination of the oxalate or hydroxide, but the normal method gives little control over the density or crystallite size. The primary object of the process described is to enable such control to be exercised. Ce(IV) hydroxide is first prepared in the manner described, and formed into a slurry with water and HNO/sub 3/. The slurry is then heated until the pH reached a steady value of <5.4, then dried to give a dry gel powder. The proportion of HNO/sub 3/ used controls the properties of the final product, and the relationship between the HNO/sub 3//CeO/sub 2/ ratio, the initial pH and the final pH is shown in tabular form. Spray drying is preferred for the slurry. The gel powder fired at about 950 deg C. It is emphasized that the process depends critically on the use of HNO/sub 3/ and that other common acids are not suitable. The gel is finally calcined to dry CeO/sub 2/. Several examples of application of the process are described, including the production of CeO/sub 2/ spheres. (UK)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-029996
- OSTI ID:
- 4323996
- Report Number(s):
- GB 1342893
- Country of Publication:
- United Kingdom
- Language:
- English
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