What needs to be done if the hydrogenation catalyst is reduced?
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Everyone has mentioned that when a hydrogenation catalyst is exposed to hot hydrogen along with oil, it is necessary to control the temperature so that it does not become too high, otherwise there is a risk that the catalyst will be reduced to its metallic state. If reduction occurs, the reduced catalyst is removed for coking regeneration; is it still possible for the metal state to revert to the oxidized state? So as not to affect the usability in the next cycle?
Even if a small amount of the sulfided catalyst is reduced, it will revert to the oxidized state after charring, and it can be sulfided again when operation resumes.
What was said upstairs is correct – temperature isn’t that important. In short, it’s the hydrogen and oxygen content that needs to be controlled; otherwise, when sulfur is present, heat is generated and oxidation will inevitably occur
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Looking at the catalyst composition, for catalysts made of W-series metals, if they are reduced to WS2, they are reduced to intermediates with an intermediate oxidation state
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