Patent ID: 7780935

Claim:
A process of reducing NO x emissions from a regeneration zone during a fluid catalytic cracking of a hydrocarbon feedstock into lower molecular weight components, said process comprising (a) contacting during a fluid catalytic cracking (FCC) process where NO x emissions are released from a regeneration zone of a fluid catalytic cracking unit (FCCU) operating in a heterogeneous combustion mode under FCC conditions, a hydrocarbon feedstock with a circulating inventory of a FCC cracking catalyst and a NO x reduction composition comprising (i) at least one NO x reduction component having a mean particle size of greater than 45 μm and having the ability to reduce NO x emissions released from a FCCU regeneration zone operating under oxidizing conditions during a FCC process without a significant increase in the content of reduced nitrogen species; and (ii) at least one reduced nitrogen species component having a mean particle size of greater than 45 μm and having the ability to reduce the content of reduced nitrogen species in a FCCU regeneration zone operating under reducing conditions during a FCC process without a significant increase in the content of NO x emissions, wherein NO x reduction component (i) and reduced nitrogen species component (ii) have different and distinct compositions and are used in an amount effective to reduce the content of NO x released from the FCCU regeneration zone; and (b) reducing the amount of NO x emissions released from the regeneration zone of the FCCU relative to the amount of NO x emissions released in the absence of the NO x reduction composition.