After catalytic cracking with a denitration agent, the iron content in the equilibrium catalyst increases

Why is it confirmed that it was caused by the addition of a denitration agent? Is there no other reason? Has the iron content in the raw material been analyzed?

Have you guys been keeping data on balancers and crude oil before? Is the iron content in the crude oil high?

Could the use of denitration agents cause the deposits on the inner wall of the pipes to fall off, or could some of them react with the metal? It would be more convincing if data could be presented to support it!

This question is asked at a pretty decent level. It is indeed possible; some CO-supporting denitration agents contain 0.01–0.02% iron oxide. If an excessive amount of such denitration agent is used, the increase in the iron content in the catalyst, measured in PPm levels, can become detectable. Furthermore, desulfurizers or sulfur transfer agents do not have such a significant impact on the equipment in the reactor and regenerator; if there is any impact, it is more likely to affect the distillation tower and subsequent pipelines, without causing an increase in the iron content in the balancing agent. Of course, it’s more likely that the iron content in the crude oil is high. Slag analysis also doesn’t thoroughly test for Ni, V, Na, Fe, and Sb. In fact, by the time it’s discovered that the iron content in the balance agent is high, it’s already unclear which batch of oil it comes from. Generally, the iron content in catalysts and slag is only tested when the regenerator turns noticeably red; after all, unusual oil grades like Russia’s M100 are quite rare. It also takes some time for the denitration agent to show significant effects. If it doesn’t significantly affect the catalyst’s activity, carry out more replacement operations, analyze the residue oil, reduce the amount of denitration agent used, and then try again.