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Quantifying FCC catalyst accessibility

Accessibility is related to the mass-transfer characteristics of an FCC catalyst. Albemarle has developed a quantitative laboratory test that measures the accessibility of FCC catalyst particles: the first such measurement in the history of FCC. This test has dramatically altered the way refiners select and evaluate catalysts. Moreover, it is another example that demonstrates Albemarle’s continuing leadership in maximizing and exploiting the benefits of FCC catalyst mass transfer. Additionally, the company has developed and introduced modifications to its manufacturing technologies that further increase the accessibility of its catalysts.

The Albemarle Accessibility Index (AAI)
The AAI test is quantitative and directly measures the dynamic diffusion of high-molecular-weight molecules into an FCC catalyst particle. The accessibility measurement is relevant to refinery operations, where Albemarle’s AAI test has multiple applications, including
- unit optimization
- unit troubleshooting
- catalyst selection
- feed slate selection.

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