The precipitation method typically involves the following steps:
1.
Preparation of Precursor Solution: A solution containing the desired metal ions is prepared. This solution may include
metal salts such as nitrates, chlorides, or sulfates.
2. Introduction of Precipitating Agent: A precipitating agent, such as a base (e.g., NaOH, NH4OH) or an anion (e.g., CO3^2-, PO4^3-), is added to the precursor solution. This agent induces the formation of an insoluble substance.
3. Precipitate Formation: The metal ions react with the precipitating agent to form a solid precipitate, which is typically a hydroxide, carbonate, or another compound.
4. Aging: The precipitate is allowed to age, which helps in enhancing its crystallinity and stability.
5. Filtration and Washing: The precipitate is filtered out from the solution and washed to remove any impurities or residual ions.
6. Drying and Calcination: The filtered precipitate is dried and then calcined (heated at high temperatures) to obtain the final catalytic material.
