Fig. 2
From: Direct catalytic hydrogenation of CO2 to formate over a Schiff-base-mediated gold nanocatalyst

Spectral analysis of the gold catalysts during CO2 adsorption/hydrogenation. a FTIR spectra of Au/SiO2-NH2 and Au/SiO2-Schiff under a humid CO2 atmosphere. b Time-resolved DRIFTS spectra of the Au/SiO2-Schiff catalyst after wet-CO2 evacuation. In situ DRIFTS spectra of the CO2 hydrogenation reaction over Au/SiO2-Schiff catalyst without c and with d the presence of a surface-bonded carbamate zwitterion