The method of adding promoters depends on the type of catalyst and the desired outcome. Common techniques include:
Co-precipitation: This involves precipitating the catalyst and promoter together from a solution, resulting in a uniform distribution. Impregnation: In this method, the catalyst support is soaked in a solution containing the promoter, which is then dried and calcined. Mechanical Mixing: The catalyst and promoter are physically mixed, often followed by pelletizing and calcination.