Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Reexamination Certificate
2011-04-05
2011-04-05
Griffin, Walter D (Department: 1774)
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
C208S120250, C208S120350, C502S074000, C502S079000
Reexamination Certificate
active
07918991
ABSTRACT:
Compositions for reduction of NOxgenerated during a catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise a fluid catalytic cracking catalyst composition, preferably containing a Y-type zeolite, and a NOxreducing zeolite having a pore size ranging from about 2 to about 7.2 Angstroms and a SiO2to Al2O3molar ratio of less than about 500 and being stabilized with a metal or metal ion selected from the group consisting of zinc, iron and mixtures thereof. Preferably, the NOxreducing zeolite particles are bound with an inorganic binder to form a particulate composition. In the alternative, the NOxreducing zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. Compositions in accordance with the invention exhibit improved effectiveness for the reduction of NOxemissions released from the regenerator of a fluid catalytic cracking unit operating under FCC process conditions without a substantial change in conversion or yield of cracked products. Processes for the use of the compositions are also disclosed.
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Krishnamoorthy M. Sundaram
Lussier Roger Jean
Ziebarth Michael Scott
Artale Beverly J.
Cross Charles A.
Griffin Walter D
Robinson Renee
W. R. Grace & Co.,-Conn.
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