Abstract: The industrial application results of CO combustion-denitration agent FPd-5 in a catalytic cracking unit of a refinery of SINOPEC against the previously-used combustion promoter was introduced. The results showed that FPd-5 agent exhibits the close results in terms of product distribution and properties to the previous promoter under the same dosage and process operation conditions. While the NOx content of regenerated flue gas was 93 mg/m3 using FPd-5，lower than the value of 200 mg/m3 required by the national standard GB 31570—2015 . At the same time，no tail-burning phenomenon was found.

Key words: FCC, combustion promoter, nitrogen oxide, product distribution