What are the reasons for the rapid deactivation of methanation catalysts?
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What are the reasons for the rapid deactivation of methanation catalysts?
1. There is a problem with the catalyst itself, such as low mechanical strength. 2. There are issues with the operation, such as overheating or incorrect fluid substitution.
Large temperature fluctuations, overheating, toxic substance effects, poor reduction, frequent start-up and shutdown, low mechanical strength, etc
If it becomes inactivated rapidly, it is likely due to poisoning, with the main cause possibly being excessive levels of elements such as sulfur and chlorine.
I agree with the idea of going upstairs; generally, the total sulfur content in methane towers is kept at 0.1 mg/m3, or the temperature is maintained low, which results in the formation of large amounts of nickel carbonyl toxin
Hydrogen sulfide and chloride ions are the main culprits; of course, an increase in temperature has an impact on the catalyst as well.
Reasons for methanation catalyst deactivation: 1. Excessive sulfur content in the feedstock. 2. Carbon deposition occurs. 3. The catalyst strength is insufficient. 4. Nickel carbonyl is formed.