Is hydrogen used for drying the catalysts in hydrogenation units?
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Although it is common in the industry to use nitrogen for drying catalysts, and I am aware that some argue that drying catalysts with hydrogen might have adverse effects on them (such as catalyst reduction), I would still like to ask if anyone here has seen any practical applications of using hydrogen for cyclic catalyst drying?
I have never seen any practical application of using hydrogen gas for the cyclic drying of catalysts; catalyst drying is always done with nitrogen.
What to use as the drying medium depends entirely on the drying temperature you control. If your drying temperature is kept below 200°C, there is no problem at all in using hydrogen as the drying medium, because at this temperature, even without sulfur supplementation, the active metal components in their oxidized state will not be reduced to elemental metal, thus preventing permanent deactivation. However, drying temperatures below 200°C can only remove the surface water molecules in the catalyst. To eliminate the crystalline water molecules as well, the bed temperature must be raised above 230°C. At this temperature, in an environment of high-purity hydrogen, the active metal components in the catalyst in their oxidized state will be reduced to elemental metals, resulting in permanent deactivation. Therefore, if you want to remove all the water from the catalyst, it is impossible to use hydrogen as a drying medium.
It depends on the drying temperature; according to the catalyst manufacturer’s drying curve, if it is below the catalyst’s reduction temperature, it isn’t a problem which medium to use. But if it exceeds the reduction temperature specified by the catalyst manufacturer, it becomes dangerous~~~~
Is this a proposal from the catalyst manufacturer to use hydrogen? Do you use hydrogen gas for drying by yourselves?
As long as the temperature is far from the catalyst reduction conditions, it should be fine. It’s better to consult your catalyst manufacturer regarding the specific details~~~ I haven’t heard of hydrogen being used for drying in a long time~~~~
Consult the catalyst manufacturers; there are risks involved
Nitrogen is generally used, right? . .
Most catalysts no longer need to be dried nowadays