The procedure typically starts by dissolving a metal salt or other precursor in a suitable solvent to create an impregnation solution. The support material, such as alumina, silica, or zeolites, is then introduced into this solution. The solution penetrates the pores of the support, allowing the precursor to be deposited uniformly. After impregnation, the material is usually subjected to drying and calcination steps to convert the precursor into the active catalytic phase.
