Simultaneous in situ Raman and FTIR spectroscopic characterisations of catalytic systems under reaction conditions have been successfully performed with the LabRAM IR using a dedicated cell. Different adsorbed NOx species (nitrito, nitrato, nitro and nitrate compounds) on the surface of the alumina supported palladium during NO exposure at 473 K have been identified by these spectroscopic measurements.

These measurements highlight the complementarity of the two techniques for investigating catalytic reactions. Indeed,  Raman spectroscopy gives access to information located at low wavenumbers, enabling the characterization of the active phase during the reaction, while the high sensitivity of IR spectroscopy allows probing adsorbed species at low concentration.