In situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy has been used to investigate the surface species involved in NOx reduction by ethanol over Ag/Al2O3 catalyst. The DRIFT measurements, carried out in dynamic conditions, were combined with gas chromatography (GC) analysis to monitor the N2 formation under C2H5OH/NO/O2/He mixture and after a switch to He followed by heating under He (mixture, 250°C→He, 250°C→Heating under He). A parallelism has been-observed between the change in isocyanate band area and the N2 formation during step change experiment. The isocyanate species (NCO) were found to be generated from the decomposition of adsorbed organic nitro compounds formed under ethanol/NO/O2/He and ethanol/NO/He. The role of oxygen in NOx reduction was investigated by performing the same set of experiment with a reaction mixture without oxygen.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry