Diffuse reflectance infrared spectroscopy of adsorbates in liquid phase.

Infrared spectroscopy is widely used to analyse the surface of solid materials central to modern chemical processes. For liquid phase experiments, the attenuated total reflection mode (ATR-IR) requires the use of waveguides that can limit a broader applicability of the technique for catalysis studies. Here, we demonstrate that high quality spectra of the solid-liquid interface can be collected in diffuse reflectance mode (DRIFTS) thus opening future applications of infrared spectroscopy. [Display omitted] • DRIFTS is demonstrated for the analysis of solid catalysts in liquid phase. • DRIFTS spectra of ZSM-5 show signals of adsorbed pyridine from cyclohexane. • CO adsorption on Pd/Al 2 O 3 presents typical signals of adsorbed CO. [ABSTRACT FROM AUTHOR]