The dry impregnation process generally involves several steps: 1. Preparation of the Support: The support material, such as alumina, silica, or zeolites, is first dried to remove any adsorbed moisture. 2. Preparation of the Precursor Solution: A solution containing the metal precursor (e.g., nitrates, chlorides) is prepared. 3. Impregnation: The precursor solution is added dropwise to the dry support under continuous stirring until the pores are filled. 4. Drying and Calcination: The impregnated support is then dried to remove the solvent, followed by calcination to convert the metal precursor into the active catalytic species.
