Transformation catalyst sulfidation
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Under what conditions in a conversion catalyst is cobalt oxide reduced to elemental cobalt?
During the sulfidation process at elevated temperatures, if the bed temperature is too high and carbon disulfide has not yet been added, cobalt oxide can be reduced to elemental cobalt by hydrogen. This is the biggest no-no when sulfiding sulfur-resistant shift catalysts!
There are three methods for sulfiding transition catalysts: feed gas heating, steam heating, and electric heating. Which method does everyone use?
Reply to 3# baozhu200499: We use electric heaters!
It seems that some literature states that when the temperature exceeds 300°C and there is no sulfidation, the presence of reducing gases such as hydrogen and CO can lead to this problem
During the sulfidation process, the bed temperature exceeds 250 degrees, and the hydrogen concentration is very high; in the absence of sulfur, catalysts that have been previously sulfidized will be reduced from their sulfided state, and in severe cases they will be reduced to elemental metal and sinter.
Reply to 3# baozhu200499: We also use electric heating