Process to reduce NOx emissions from a fluid catalytic cracking unit

摘要

A multistage process for reducing NOx in flue gas from fluid catalytic cracking catalyst regeneration. Flue gas is preferably removed after each stage. NOx formed in each regeneration stage is converted to N2 prior to discharge from a stage by operating at least the downstream ends of each regeneration stage at oxygen-lean conditions. Staged regeneration can be achieved by passing spent catalyst through a transport reactor in plug type flow and sequentially contacting the catalyst with a plurality of oxygen-containing streams.