Dear Adarsh,

Pyridine IR may be useful for you. Number of active sites in the acidic catalyst can be estimated using pyridine IR. Pyridine has basic nature of N-atom present and adsorbed at the acidic sites through the N-atoms. Then, you can find the number of acidic sites present at the acidic catalyst.

Metal dispersion technique is used for the dispersion of the metal at the oxide support and also determine the total active sites (acidic & basic sites).

Thanks

Dear Adarsh,

You have multi-sites and metal dispersion should be considered also. Since you are dealing with heterogeneous catalyst, the number of surface active sites is priority, hence the chemisorption measurements are highly recommended. The H2-pulse analysis can be used to determine the actives of incorporate metals and H2-TPD can be used to analyze the strength. The two analysis can be performed sequentially. The acid sites could be determined by NH3-TPD or Pyridine IR as pointed out by Pankaj.

If you give us more information about the composite you are using one might be able to suggest you a method.

The number of acid and basic sites could be obtained by NH3-TPD and CO2-TPD, respectively. Pyrimidine IR could also be used for acidity but Pyrimidine is not environmentally friendly, especially for men.

Thanks for the valuable suggestions.

I am working on hydrodeoxygenation and my catalyst is noble metal loaded zeolite. In my case both metal and acidic sites are responsible for catalyst activity. So i can not go through single specific method. For further valuable suggestions and recommendation, please email me at [email protected]

Thank you very much