Acid Site Density: The total amount of ammonia desorbed correlates with the number of acid sites on the catalyst. Acid Strength Distribution: The temperature at which ammonia desorbs indicates the strength of the acid sites. Lower temperatures suggest weaker acid sites, while higher temperatures indicate stronger acid sites. Type of Acid Sites: By combining TPAD with other techniques like infrared spectroscopy (IR), it is possible to distinguish between different types of acid sites (e.g., Brønsted vs. Lewis acids).
