How to Determine the Number and Accessibility of Active Sites?
The quantification of active sites is often achieved through techniques such as chemisorption, where the adsorption of probe molecules (e.g., CO, H2, or NH3) is measured. The amount of adsorbed probe molecules can be correlated to the number of active sites. Surface area measurements using Brunauer-Emmett-Teller (BET) analysis also provide insights into the accessibility of active sites.
