Comment on the “Reaction intermediates recognized by in situ FTIR spectroscopy in CO2 hydrogenation over the Cu/ZnO/SPP-zeolite catalyst” by X. Liu et al., RSC Appl. Interfaces, 2025, 2, 114

Abstract

Gaseous CO₂ exhibits hundreds of bands in the mid-IR region due to transitions between excited states and isotopologues. The intensity of these bands are orders of magnitude lower than that of the main features and are often misinterpreted as bands of adsorbates.