| abstract |
Process for the preparation of a metal-containing composition, which process comprises the steps of (a) calcining a physical mixture of an anionic clay and a metal additive at a temperature between 200 and 800°C, and (b) rehydrating the calcined product of step a). This process allows the use of insoluble metal additives. It does not require the use of soluble metal additives, which has economic and environmental advantages. |