Types of catalyst poisoning in catalytic devices
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Types of catalyst poisoning in catalytic units: We know that nickel, vanadium, iron, and calcium poisoning are relatively common in catalysts. Have you encountered any of these types? What are the symptoms associated with them? (Please discuss aspects such as the color of the catalyst, the yield of light oil, and changes in operations within the regenerator.)
Iron poisoning causes the catalyst to turn red, increases the amount of char formed, and raises the hydrogen content in the dry gas. Affects fluidization. However, this does not affect the activity and specific surface area. The toxicity of vanadium has a minimal impact; but when the amount of vanadium in the balancing agent exceeds 6000, the catalyst’s activity decreases significantly, its specific surface area also drops markedly, the catalyst becomes more fragmented, and the amount of fine powder increases. At this point, rapid replacement is necessary to switch to a different raw material; if the sodium level remains high, the impact will be even more severe ； Calcium poisoning affects fluidization; the activity of the balancing agents and their specific surface area are both high, but the specific surface area was determined using the nitrogen adsorption method – in reality, calcium has already coated the catalyst. Replacement is required. There’s no major issue with nickel; just add more passivating agent
We’re poisoned with nickel and vanadium! The catalyst’s activity cannot be increased! Dry gas yield is too high! The hydrogen to methane ratio in the dry gas exceeds 2! The treatment involves replacing the catalyst with a balancing agent! Increase the amount of passivator added! Contact the manufacturer to mix a passivator using the formula! Another method is to pre-treat the raw materials with a treatment agent! Add the additive before feeding!