The adsorption of NO and NO2 and the reaction between NO and O2 were investigated on a Na-Y,FAU zeolite. The interaction between NO and Na-Y is weak and no IR absorption feature is seen upon room temperature adsorption. On the other hand, several NOx species were identified in the adsorption of NO2 bonded to Lewis acidic (NO3-, NO2-) and basic sites (NO? and [NO?][NO2] and [NO?][N2O4]). In the NO?O2 reaction, N2O3 was formed and adsorbed N2O3 was observed in addition to the species detected upon NO2 adsorption. A series of experiments were conducted to unambiguously assign the IR features in the 2000-2120cm-1 spectral range. Through reaction and isotopic substitution (N15O and O182) experiments, these bands were assigned to NO? adsorbed onto framework O- sites as charge compensating cations. Key words: NOx reduction; Na-Y,FAU; IR spectroscopy of adsorbed NOx, isotopic substitution.
Revised: April 1, 2008 |
Published: September 15, 2003
Citation
Szanyi J., J. Kwak, R.A. Moline, and C.H. Peden. 2003.The Adsorption of NO2 and the NO+O?² Reaction on Na-Y,FAU: an in situ FTIR Investigation.Physical Chemistry Chemical Physics. PCCP 5, no. 18:4045-4051.PNNL-SA-38858.