Several techniques are employed to measure pore size distribution, including:
- Nitrogen Adsorption-Desorption Isotherms: This method involves measuring the amount of nitrogen gas adsorbed by the catalyst at different pressures. The data is analyzed using the Brunauer-Emmett-Teller (BET) theory, Barrett-Joyner-Halenda (BJH) method, or Density Functional Theory (DFT). - Mercury Intrusion Porosimetry: This technique measures pore size distribution by forcing mercury into the pores under high pressure. It is particularly useful for analyzing mesopores and macropores. - Small-Angle X-ray Scattering (SAXS): SAXS provides information about the size, shape, and distribution of pores by scattering X-rays through the catalyst material. - Electron Microscopy: Techniques such as Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) can visualize pores directly and provide detailed pore size information.
