In-situ DRFTs analysis of ICCU-RWGS using Pt-Na/Al2O3

Dual functional materials, including Pt as the catalytic sites and Na as the sorbent sites, were used for ICCU-RWGS. Al₂O₃ was used as the support (https://doi.org/10.1021/acscatal.1c05339). The reported CO₂ capture capacity and CO production were relatively low compared to other literature, due to the reaction temperature (350 °C), which was too low for RWGS. In addition, the capacity of CO₂ capture for Na-based sorbent was also low. However, the authors studied the mechanisms of the Pt-Na/Al₂O₃ assisted ICCU using DRIFTs. As indicated below, signals related to CO₃2- were clearly presented and used to indicate the capacity of CO₂ capture. For example, the Pt/Al₂O₃ sample showed little sign of CO₂ capture related to this absorption peak. In addition, the CO-Pt related peak was used to demonstrate the extent of CO production.

“In situ FTIR measurements during CCR for (a) Pt/Al₂O₃, (b and c) Pt–Na/Al₂O₃, and (d) Pt–Mg/Al₂O₃. The background spectra were taken before CO₂ capture. After CO₂ capture for 5 min under a CO₂/O₂ flow (100 mL/min 1% CO₂/10% O₂/N₂), the flow gas was changed to H₂ (100 mL/min 5% H₂/N₂). The time (t) denotes the period of reduction with H₂.” https://doi.org/10.1021/acscatal.1c05339