Compositions for reduction of gas phase reduced nitrogen species and NOx generated during a partial or incomplete combustion catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise (i) an acidic metal oxide containing substantially no zeol
Compositions for reduction of gas phase reduced nitrogen species and NOx generated during a partial or incomplete combustion catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise (i) an acidic metal oxide containing substantially no zeolite, (ii) an alkali metal, alkaline earth metal, and mixtures thereof, (iii) an oxygen storage component, and (iv) a noble metal component, preferably rhodium or iridium, and mixtures thereof, are disclosed. Preferably, the compositions are used as separate additives particles circulated along with the circulating FCC catalyst inventory. Reduced emissions of gas phase reduced nitrogen species and NOx in an effluent off gas of a partial or incomplete combustion FCC regenerator provide for an overall NOx reduction as the effluent gas stream is passed from the FCC regenerator to a CO boiler, whereby as CO is oxidized to CO2 a lesser amount of the reduced nitrogen species is oxidized to NOx.
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What is claimed is: 1. A composition for reducing the content of NOx and gas phase reduced nitrogen species during catalyst regeneration in a fluid catalytic cracking (FCC) process said composition comprising particles having a mean particle size of about 50 to about 200 μm and comprising (i)
What is claimed is: 1. A composition for reducing the content of NOx and gas phase reduced nitrogen species during catalyst regeneration in a fluid catalytic cracking (FCC) process said composition comprising particles having a mean particle size of about 50 to about 200 μm and comprising (i) at least about 5.0 wt % of acidic metal oxide containing substantially no zeolite; (ii) a metal component selected from the group consisting of alkali metal, alkaline earth metal, and mixtures thereof; (iii) at least 0.1 wt %, measured as metal oxide, of an oxygen storage metal oxide; and (iv) at least 0.1 ppm of a noble metal component comprising palladium and at least one metal selected from the group consisting of platinum, iridium, rhodium, osmium, ruthenium, rhenium and mixtures thereof, said metal component (ii) being present in amount of at least 0.5 wt %, measured as metal oxide, of the composition. 2. The composition of claim 1 wherein the acidic metal oxide is selected from the group consisting of alumina, silica alumina, lanthana alumina and zirconia alumina. 3. The composition of claim 2 wherein the said acidic metal oxide is silica alumina. 4. The composition of claim 1 wherein the acidic metal oxide further comprises at least one stabilizing metal oxide. 5. The composition of claim 4 wherein the stabilizing metal oxide is selected from the group consisting of yttria, neodymia, samaria, europia, gadolinia and mixtures thereof. 6. The composition of claim 1 wherein the component (ii) is alkali metal. 7. The composition of claim 6 wherein said alkali metal is selected from the group consisting of sodium, potassium, cesium, lithium and mixtures thereof. 8. The composition of claim 7 wherein the alkali metal is sodium or potassium. 9. The composition of claim 8 wherein the alkali metal is sodium. 10. The composition of claim 1 wherein component (ii) contains an alkaline earth metal. 11. The composition of claim 10 wherein the alkaline earth metal is selected from the group consisting of magnesium, calcium, barium, strontium and mixtures thereof. 12. The composition of claim 11 wherein the alkaline earth metal is magnesium. 13. The composition of claim 1 wherein the oxygen storage component (iii) is a rare earth metal oxide having oxygen storage capability, a transition metal oxide having oxygen storage capability, and mixtures thereof. 14. The composition of claim 13 wherein the oxygen storage component (iii) is a rare earth metal oxide having oxygen storage capability. 15. The composition of claim 14 wherein the rare earth metal oxide is selected from the group of ceria, samaria, praseodymia, europia, terbia and mixtures thereof. 16. The composition of claim 15 wherein at least a portion of the rare earth metal oxide comprises ceria. 17. The composition of claim 16 wherein the rare earth metal oxide consists essentially of ceria. 18. The composition of claim 13 wherein the oxygen storage component (iii) is a transition metal oxide having oxygen storage capability. 19. The composition of the above claim 18 wherein the transition metal oxide is selected from the group consisting of vanadium, manganese oxide, iron oxide, nickel oxide, copper oxide, cobalt oxide, chromia, titania, silver oxide, molybdenia, niobia, gold oxide, tungsten oxide and mixtures thereof. 20. The composition of claim 13 wherein the oxygen storage metal oxide component (iii) further comprises at least one stabilizing metal oxide. 21. The composition of claim 20 wherein the stabilizing metal oxide is selected from the group consisting of zirconia, lanthana, neodymia, gadolinia, yttria, scandia, hafnia and mixtures thereof. 22. The composition of claim 1 wherein the noble metal component is selected from the group consisting of platinum iridium, rhodium and mixtures thereof. 23. The composition of claim 22 wherein the noble metal component is selected from the group consisting of rhodium, iridium and mixtures thereof. 24. A fluid cracking catalyst comprising (a) a cracking component suitable for catalyzing the cracking of hydrocarbons, and (b) the composition of claim 1. 25. The cracking catalyst of claim 24 wherein said cracking catalyst comprises an admixture of components (a) and (b). 26. The cracking catalyst of claim 24 wherein said catalyst comprises integral particles which contain both components (a) and (b). 27. The cracking catalyst of claim 24 wherein component (b) comprises at least 0.01 wt % of the cracking catalyst.
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