The corrosion leakage of shift gas cooler in acitic gas removal unit in a coal char hydrogen production plant led to the gradual deactivation of the downstream methanation catalyst. This paper analyzed the reasons of catalyst deactivation from the mechanism of catalyst poisoning, carbon deposition, sintering and catalyst loss, and presented the measures to extend the life of the catalyst, such as changing the material of the equipment, reducing sulfur content in raw hydrogen, and raise the bed temperature etc.
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