Abstract: In order to meet the strict environmental requirements, the denitrification additive D was used in a similar way as the CO combustion additive to reduce NOx content in FCC regenerated flue gas in a trial run in CNOOC Huizhou Refinery. Due to the existence of catalytic additive, NO can be translated to N2 in FCC regenerator. The results indicate that the effect of denitrification additive D on the activity of catalyst, product distribution and the nature of the gasoline, diesel is not obvious. It is concluded that NOx content in FCC regenerated flue gas can be controlled by addition of such kind of additive without any more process modification.

Key words: FCC, regenerator flue gas, NOx, denitrification additive