Hydrogenation catalyst drying issue
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Drying the hydrogenation catalyst with hydrogen at 220 degrees Celsius for 6 hours, at a hydrogen pressure of 15 MPa – will this have an impact on the catalyst’s subsequent use?
It’s hard to say; generally, nitrogen is used for drying catalysts. It is said that the catalyst can be reduced at 230°C, but it cannot be guaranteed that it won’t be reduced at 220°C either. Therefore, it is recommended to use nitrogen instead of hydrogen for drying
I remember discussing this with people from catalyst manufacturers; for cobalt-molybdenum catalysts, reduction starts around 250°C. It seems that nickel-tungsten catalysts require an even higher temperature. 230°C already leaves some margin, but no one wants to take that risk. In any case, nitrogen is used for drying
You all did this. How is the reaction effect now? Is it okay?
Won’t using nitrogen affect the outlet temperature of the circulator?
It is necessary to consider what the active component of the catalyst is, whether the hydrogen used is wet hydrogen or dry hydrogen, as well as the carbon monoxide content in the hydrogen, in order to make a judgment
In your scheme, the catalysts are usually reduced, which results in a significant decrease in their activity. Generally, nitrogen is used for drying the catalysts, at a temperature of 250°C and a pressure of 2.5 MPa