Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2006-04-18
2006-04-18
Nguyen, Cam N. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S241000, C502S242000, C502S243000, C502S244000, C502S245000, C502S247000, C502S250000, C502S251000, C502S252000, C502S257000, C502S261000, C502S262000, C502S263000, C502S302000, C502S303000, C502S304000, C502S309000, C502S312000, C502S314000, C502S318000, C502S327000, C502S328000, C502S330000, C502S331000, C502S334000, C502S339000, C502S415000, C502S439000, C502S333000
Reexamination Certificate
active
07030055
ABSTRACT:
Compositions for reduction of gas phase reduced nitrogen species and NOxgenerated 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 NOxin an effluent off gas of a partial or incomplete combustion FCC regenerator provide for an overall NOxreduction as the effluent gas stream is passed from the FCC regenerator to a CO boiler, whereby as CO is oxidized to CO2a lesser amount of the reduced nitrogen species is oxidized to NOx.
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Rudesill John Allen
Yaluris George
Artale Beverly J.
Cross Chuck A.
Nguyen Cam N.
W.R. Grace & Co.-Conn.
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