The former dissolved passivation agent in liquid and finally deposited on the catalyst surface during FCC processing. It reacts with metals on catalyst and takes a role of passvition.

• 前者是将钝化剂组元溶于液体中，在FCC生产过程中钝化组元沉积在催化剂上，并与污染金属反应而起到钝化作用。