PREPARATION OF MATERIALS

PREPARATION OF MATERIALS

The invention provides a process for the preparation of a dispersible cerium compound (i.e. a cerium compound which may be dispersed in a liquid to give a colloidal dispersion (i.e. a sol)).The process involves replacing a first species of ions associated with the cerium compound by a second species...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: JAMES LOUIS WOODHEAD
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
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Beschreibung
Zusammenfassung:The invention provides a process for the preparation of a dispersible cerium compound (i.e. a cerium compound which may be dispersed in a liquid to give a colloidal dispersion (i.e. a sol)).The process involves replacing a first species of ions associated with the cerium compound by a second species of ions (e.g. hydroxyl ions) and subsequently replacing the second species of ions of the cerium compound with a third species of ions (e.g. counter-ions).The replacing of the ions may be effected, for example, by ion-exchange.Cerium (IV) oxide hydrate is an example of a cerium compound which can be made dispersible in accordance with the invention.