NOx reduction compositions for use in FCC processes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-008/00
B01J-021/08
B01J-021/12
B01J-021/14
B01J-023/00
출원번호
US-0642924
(2003-08-18)
발명자
/ 주소
Yaluris, George
Rudesill, John Allen
출원인 / 주소
W. R. Grace &
Co.-Conn.
인용정보
피인용 횟수 :
10인용 특허 :
36
초록▼
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.
대표청구항▼
1. A method of reducing gas phase reduced nitrogen species emissions from the regeneration zone during fluid catalytic cracking of a hydrocarbon feedstock into lower molecular weight components, said method comprising contacting a hydrocarbon feedstock with a cracking catalyst at elevated temperatur
1. A method of reducing gas phase reduced nitrogen species emissions from the regeneration zone during fluid catalytic cracking of a hydrocarbon feedstock into lower molecular weight components, said method comprising contacting a hydrocarbon feedstock with a cracking catalyst at elevated temperature whereby lower molecular weight hydrocarbon components are formed, said cracking catalyst comprising (a) a cracking component suitable for catalyzing the cracking of hydrocarbons, and (b) a component for reducing gas phase reduced nitrogen species, said component 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 selected from the group consisting of platinum, palladium, 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 method of claim 1 further comprising recovering the cracking catalyst from said contacting step and treating the used catalyst in a regeneration zone to regenerate said catalyst.3. The method of claim 2 wherein the regeneration zone is operated in a partial mode of combustion.4. The method of claim 2 wherein the regeneration zone is operated in incomplete mode combustion.5. The method of claim 1 wherein components (a) and component (b) are fluidized during contacting said hydrocarbon feedstock.6. A method of reducing NOx emissions from the regeneration zone during fluid catalytic cracking of a hydrocarbon feedstock into lower molecular weight components, said method comprising contacting a hydrocarbon feedstock with a cracking catalyst at elevated temperature whereby lower molecular weight hydrocarbon components are formed, said cracking catalyst comprising (a) a cracking component suitable for catalyzing the cracking of hydrocarbons, and (b) a NOx reduction component 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 selected from the group consisting of platinum, palladium, 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.7. The method of claim 6 further comprising recovering the cracking catalyst from said contacting step and treating the used catalyst in a regeneration zone to regenerate said catalyst.8. The method of claim 7 wherein the regeneration zone is operated in a partial mode of combustion.9. The method of claim 7 wherein the regeneration zone is operated in an incomplete mode of combustion.10. The method of claim 6 wherein components (a) and component (b) are fluidized during contacting said hydrocarbon feedstock.
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Samish Norman C. (Houston TX) Gwyn John E. (Katy TX), Process for the reduction of NH3in regeneration zone off gas by select recycle of certain-sized NH3<.
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