Diesel hydrogenation Recycle hydrogen Hydrogen sulfide
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Dear teacher: Why must the hydrogen sulfide content in the recycle hydrogen used in diesel hydrogenation not be lower than ≤0.1%? Thank you! ! !
The hydrogen sulfide concentration requirements in circulating hydrogen are generally set by catalyst manufacturers, in order to prevent the catalytic materials in their sulfided state from being reduced by hydrogen at high temperatures. Different catalysts have different requirements from different manufacturers!
At high temperatures, hydrogen reduces the catalyst, causing it to lose its activity.
Prevent the sulfided catalyst from being reduced
It is mainly to protect the catalyst at the reaction inlet from being reduced
Prevent the catalyst from being reduced, as the catalysts are in a sulfided state
Catalysts are all used in their sulfided state; the presence of hydrogen sulfide in the system is necessary to maintain catalyst activity, and different catalysts have different requirements