Generally to know the porosity of the material we use BET characterization. Here im working with catalyst and i want to know the estimation of number of active site of the catalyst. Please help to know this issue.
You need to identify the nature of your active sites. Chmisorption followed by TPD (preferably in inert atmosphere to avoid re-adsorption)may be a suitable method in case of that your surface has same composition . Chemisorption technique, it is not easy because a catalyst may have different types of active sites. Also, you need to do CO-adsorption and monitoring of adsorption by FTIR technique.
It depends on what is your catalyst and your metal. I would recommend gas chemisorption, since it can measure directly the amount of active sites.
If you do a search in Google, you will find a lot of information. Including lots of scientific articles on this topic. Give it a try!
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