Why does the catalytic cracking performance of reactors deteriorate in oil refining when the nitrogen content in the feed gas exceeds a few hundred ppm?
Thread Content
Why does the catalytic cracking performance of reactors deteriorate in oil refining when the nitrogen content in the feed gas exceeds a few hundred ppm?
When the content of nitrogen-containing compounds in the feedstock, especially basic nitrogen compounds, is high, it can cause catalyst poisoning and reduce its activity.
Reply to 2# wyt1234: This causes short-term deactivation of the FCC catalyst
I’m not very familiar with other processes, but for hydrocracking, it’s a serious problem. When reactions take place in the system, the nitrogen present in the feedstock reacts with hydrogen to form NH3, which is basic in nature. However, the cracking reactions that occur in our hydrocracking catalysts take place at acidic sites; as a result, the basic nitrogen compounds react with these acidic sites, which reduces the catalyst’s activity. Moreover, this is an irreversible reaction, and over time the catalyst becomes permanently inactive!