Relation Between the Magnetic Properties of Fe-ZSM-11 and its Catalytic Activity for SCR of NOx

MARCOS B. GÓMEZ COSTA; ANDREA R. BELTRAMONE; OSCAR A. ANUNZIATA

Huerta Grande, Córdoba

Taller; V Taller Iberoamericano en Ciencia e Ingeniería de Materiales (V TIECIM); 2006

UNS

Fen+-ZSM-11 zeolites, with Fe2+ and/or Fe3+ as active sites prepared by us by reproducible post-synthesis methods showed magnetic properties. Otherwise, they are very important in environmental catalysis for the reduction of NOx to N2 with hydrocarbons. Fe-ZSM-11 has recently received much attention in catalysis research because of its promising activity in the decomposition or selective reduction of nitrous oxide. Nanoscale magnetism currently provides a wealth of scientific interest and of potential applications. In the present work, we correlated the catalytic activity of the zeolites type ZSM-11 with different content of Fe2+ and/or Fe3+ with their magnetic properties. ZSM-11 zeolites, with Fe2+ and/or Fe3+ as active sites are very important in environmental catalysis for the reduction of NOx to N2 with hydrocarbons. The magnetic and catalytic properties of Fe-ZSM-11 samples with different contents of Fe2+ and Fe3+ were compared. Fe2+ species bonded to the framework could generate ferromagnetic couples conferring the ferromagnetic behavior to the samples. The saturation magnetization of the other samples is smaller due to the lower amount of couples Fe2+-Fe2+.  When the amount of Fe3+ increases, the Fe bonded to the structure as counter ion decreases, forming a-Fe2O3 as isolated clusters non active for the reduction of NO.