The impregnation method works by soaking the support material in a solution containing the active catalytic component. The process can be controlled to achieve the desired distribution and concentration of the active species. There are two main types of impregnation:
1. Incipient Wetness Impregnation: In this approach, the volume of the solution used is just enough to fill the pores of the support material. This ensures that the active species are deposited inside the pores, leading to high dispersion. 2. Excess Solution Impregnation: Here, an excess amount of solution is used, and the support is then filtered and dried. This method can lead to different dispersion characteristics compared to incipient wetness impregnation.
