Patent ID: 7909986

Claim:
A process for reducing the content of gas phase reduced nitrogen species in the off gas derived from a regeneration zone of a fluid catalytic cracking unit (FCCU), said process comprising contacting under catalytic cracking conditions gas phase reduced nitrogen species contained in the regeneration zone off gas of a FCCU operated in a partial or incomplete mode of combustion during a fluid catalytic cracking (FCC) process, with a gas phase reduced nitrogen species oxidative catalyst/additive composition in an amount sufficient to convert the gas phase reduced nitrogen species present in the off gas to molecular nitrogen to provide a regeneration zone off gas having a reduced content of gas phase reduced nitrogen species relative to the content of gas phase reduced nitrogen species present in the regeneration zone off gas without the oxidative catalyst/additive composition, said oxidative catalyst/additive composition having a mean particle size of about 50 to about 200 μm and being selected from the group consisting of (A) an acidic oxide support promoted with at least one metal promoter selected from the group consisting of alkali and/or alkaline earth metals, transition metals, rare earth metals, platinum group metals, Group Ib metals, Group IIb metals, Group VIA metals, germanium, tin, bismuth, antimony and mixtures thereof, (B) a hydrotalcite promoted with at least one metal promoter selected from the group consisting of alkali and/or alkaline earth metals, transition metals, rare earth metals, platinum group metals, Group Ib metals, Group IIb metals, Group VIA metals, germanium, tin, bismuth, antimony and mixtures thereof, (C) a spinel promoted with at least one metal promoter selected from the group consisting of alkali and/or alkaline earth metals, transition metals, rare earth metals, platinum group metals, Group Ib metals, Group IIb metals, Group VIA metals, germanium, tin, bismuth, antimony, and mixtures thereof, and (D) mixtures thereof.