Modifying the active metal involves changing its type, concentration, or oxidation state. This can be achieved through various methods: - Impregnation: A solution containing the metal salt is applied to the support, followed by drying and calcination. - Co-precipitation: Metals and supports are precipitated together from a solution, ensuring uniform distribution. - Ion Exchange: Metal ions are exchanged with ions on the support, often used for zeolite-based catalysts.
