Nox reduction compositions for use in partial burn fcc...

B - Operations – Transporting – 01 – J

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B01J 29/65 (2006.01) B01J 23/06 (2006.01) B01J 23/745 (2006.01) B01J 29/072 (2006.01) B01J 29/68 (2006.01) B01J 29/80 (2006.01) C10G 11/05 (2006.01) C10G 11/18 (2006.01)

Patent

CA 2606513

A NOx reduction composition and process of using the composition to reduce the content of NOx emissions 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 NOx reduction composition. The NOx reduction composition has a mean particle size of greater than 45 µm and comprises (1) a zeolite component having (i) a pore size of form 2-7A Angstroms and (ii) a SiO2 to Al2O3molar 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.

L'invention concerne une composition de réduction des NOx et un procédé d'utilisation de cette composition destiné à réduire le contenu d'émissions de NOx et d'espèces azotées réduites en phase gazeuse libérées dans la zone de régénération pendant le craquage catalytique fluide d'une charge d'hydrocarbures en composants de masse moléculaire plus petite. Ce procédé consiste à mettre en contact une charge d'hydrocarbures avec une charge circulante d'un catalyseur de craquage catalytique fluide (CCF) et d'une composition de réduction des NOx en particules, pendant un processus de CCF au cours duquel la zone de régénération est utilisée dans un mode à combustion partielle ou incomplète, dans des conditions de CCF. La composition de réduction de NOx présente une granulométrie moyenne supérieure à 45µm et comprend (1) un composant zéolite présentant (i) une dimension de pores comprise entre 2 et 7,1 Angstroms, et (ii) un rapport molaire SiO2/Al2O2 inférieur à 500, et (2) au moins un métal noble choisi dans le groupe suivant: platine, palladium, rhodium, iridium, osmium, ruthénium, rhénium, et des mélanges de ceux-ci.

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