Why is the activity of the catalyst layer sometimes found to be increased after driving?

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This post was last edited by in the blink of an eye on 2018-6-30 at 20:45. I remember that a few years ago (or maybe last year), a colleague in the industry discussed with me a problem that had been bothering him for a long time: after shutting down the acid production process, when it was restarted, the activity of the first layer of catalyst increased slightly, but he didn’t know why. Factory users judge the activity of the catalyst primarily based on the temperature rise of the bed. Recently, I once again thought of this matter; it is very likely that during the acid-production shutdown, over-blowing occurred at the first stage, and as a result, some of the SO3 in the pyrosulfates in the catalyst of that stage was blown out. Upon restarting the engine and introducing air, the catalyst once again absorbs SO3 to form pyrosulfates, thereby generating a heat effect.