Sorry my last message. If ABD is lesser than previous analysis,then, there are less fines catalysts in the vessels and therefore losses could have increased. This analysis is a good method to assess the catalyst performance in the cyclones, in reference to the catalyst recuperation.
If you want to check losses or catalysts performance in an FCC Unit, you have to study and understand the analysis of equilibrium catalysts, either physical analysis or chemicals analysis. That is to say, your inquire is better to analyze it by Particle Size Distribution (PSD) and Apparent Bulk...
