Several methods are employed to control the particle size of catalysts:
1. Precipitation and Co-precipitation: This involves precipitating the catalyst material from a solution, where parameters like pH and temperature can be adjusted to control particle size. 2. Sol-Gel Technique: This method allows for precise control over particle size and distribution by manipulating the gelation process of a solution. 3. Mechanical Milling: This physical method reduces particle size through grinding, though it may introduce defects in the particles. 4. Thermal Decomposition: Controlling the decomposition temperature and time can yield particles of specific sizes.
