W. R. Grace Co.-Conn.

M Sundaram Krishnamoorthy

Michael Scott Ziebarth

Roger Jean Lussier

John Allen Rudesill

George Yaluris

A NOreduction composition and process of using the composition to reduce the content of NOemissions and gas phase reduced nitrogen species released from the regeneration zone during fluid catalytic cracking of a hydrocarbon feedstock into lower molecular weight components is disclosed. The process comprises contacting a hydrocarbon feedstock during a fluid catalytic cracking (FCC) process wherein a regeneration zone of an fluid catalytic cracking unit (FCCU) is operated in a partial or incomplete combustion mode under FCC conditions, with a circulating inventory of an FCC cracking catalyst and a particulate NOreduction composition. The NOreduction composition has a mean particle size of greater than 45 &#x3bc;m and comprises (1) a zeolite component having (i) a pore size of form 2-7 A Angstroms and (ii) a SiOto AlOmolar ratio of less than 500, and (2) at least one noble metal selected from the group consisting of platinum, palladium, rhodium, iridium, osmium, ruthenium, rhenium and mixtures thereof.

[object Object]

Compositions for reduction of NOgenerated 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 NOreducing zeolite having a pore size ranging from about 2 to about 7.2 Angstroms and a SiOto AlOmolar 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 NOreducing zeolite particles are bound with an inorganic binder to form a particulate composition. In the alternative, the NOreducing 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 NOemissions 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.

Growing community of inventors

Columbia, MD, United States of America

M Sundaram Krishnamoorthy