NO-Assisted N2O Decomposition over ex-Framework FeZSM-5: Mechanistic Aspects

摘要: The decomposition of N2O over an ex-framework FeZSM-5 catalyst is strongly promoted by NO. Activity data show that the promoting effect NO catalytic, and besides NO2, O2 formed much more extensively in presence, than absence Transient situ FT-IR/MS measurements indicate adsorbed on surface up to at least 650 K, showing absorption frequencies 1884 1876 cm−1. A change gas phase composition from results formation identified a sharp IR band 1635 Switching back original induces rapid desorption restoring frequencies. During measurements, bands typical nitro- or nitrate groups were not observed. Multi-Track (a TAP-like technique) experiments presence NO2 significantly enhances rate oxygen time exposure catalyst. spectral changes transient are discussed catalytic cycles proposed, explain (enhanced) oxygen. latter can be either explained indirect (electronic, steric) sites neighboring active sites, direct involving reaction with oxidized yielding O2.