| http://www.w3.org/ns/prov#value | - In the first aspect of the present invention, when the suspension of cerium (III) hydroxide containing an oxidizing substance such as nitric acid is subjected to a hydrothermal treatment at a temperature of not lower than 100??? C. in an inert gas atmosphere instead of causing the suspension of cerium (III) hydroxide to react using an oxidant such as air at a temperature of 10 to 95??? C. and at n
|
