Pt-based DFMs for ICCU-RWGS

The following content is copied from this reference (https://doi.org/10.1016/j.ccst.2022.100052) regarding the use of Pt as catalytic sites of DFMs for ICCU-RWGS.

“At a milder temperature of 350°C, the continuous CO₂ capture and reduction to CO from 1%CO₂/10%O₂/N₂ were reported on Pt-Na/Al₂O₃ DFMs (Li et al., 2022). In this study, different basic metals (K, Na, Mg, and Ca) were investigated for the modification of Pt/Al₂O₃ in ICCC, among which, Pt-Na/Al₂O₃ showed superior performance with much higher CO yield (0.158 mol/kg) and selectivity (89%). Na-modified Pt nanoparticles (NPs) were formed on Al₂O₃, in which Na served as the CO₂ capture sites adjacent to Pt NPs and suppressed the sorption of formed CO, thus hindering the further hydrogenation of CO to CH₄ and leading to higher CO selectivity. A 100 h (6000 cycles) continuous operation of the Pt-Na/Al₂O₃ was conducted in dual fixed bed reactors by switching the CO₂ and H₂ gas streams in between every 30 s, as shown in Fig. 20. The uncaptured CO₂ was about 540 ppm, corresponding to a capture efficiency of ∼90% (inlet CO₂: 5000 ppm). The CO concentration ranged from 2500 to 4200 ppm, while that of CH₄ maintained below 200 ppm. No significant decrease in the CO₂ uptake and CO productivity were observed. The continuous operation demonstrates the promise of the ICCC for both CO₂ reduction and utilization in one process under mild conditions (Li et al., 2022). Similar to previously reported studies, the addition of steam caused a decrease in CO₂ conversion efficiency and CO yield in the continuous operation, indicating the necessity of water removal before ICCC or developing water-resistant DFMs for the industrial flue gas applications.”

“Fig. 20. (a) Reactor system of continuous ICCC operation, (b) 100 h (6000 cycles) long-term operation using the continuous reactor system with Pt-Na/Al₂O₃ at 350°C (Li et al., 2022).”