Toluene and butane adsorption combined with SCR-NOx on AgNaMordenite

SOLEDAD G. ASPROMONTE; EDUARDO E. MIRÓ; ALICIA V. BOIX

Valencia

Conferencia; 5th International FEZA Conference: Innovations in zeolites and ordered porous solids; 2011

Spanish Zeolite Group, under the auspices of the Federation of European Zeolite Associations

In this work the toluene and butane adsorption at low temperature and the interaction with the NO molecule for the SCR-NOx were studied. Ag exchanged on NaMordenite catalysts were prepared with different content of silver.By TPR, a small fraction (20%) of Ag2O species and Ag+ ions at exchanged positions within NaMOR were observed. The FTIR studies showed that the hydrocarbons were adsorbed preferentially on Ag+ sites and reacted with the NO flow producing intermediates compounds of the SCR-NOx, such as surface cyanide, isocyanide and isocyanate species adsorbed on Ag+ ions. Thus, the presence of Ag+ ions on the prepared samples represent the sites where the hydrocarbons is adsorbed and allow to hold them at 400°C. Instead, the presence of Ag2O have a double function because the oxidation of hydrocarbon was produced, but at the same time, interact with NO molecules producing NO2 species as a result of Ag2O reduction.