FeCrCu-K supported on hydrotalcite has been used for ICCU-RWGS. (https://doi.org/10.1016/j.jcou.2016.04.003). The dual functional materials were prepared by simple wet impregnation. The experiments were carried out under 450 °C while the concentration of CO2 varied between 5.8 and 9.5%. In addition, the amount of materials for each test was around 1 g and the particle size was between 200 and 300 um. As shown in the following figure, with the increase of CO2 concentration, it is clear that the CO2 capture efficiency and CO2 conversion were reduced; however, the CO selectivity was increased with the increase of CO2 concentration. The results should be affected by the amount of dual functional materials. The concentration of CO2 might have little influence on ICCU performance if sufficient sorbent was applied. The results also show the influence of the presence of moisture and O2. This will be discussed in separate articles.
“Figure – CO2 capture efficiency, CO2 conversion, and CO selectivity as a function of CO2 concentration (5.8–9.5%) at 450 °C. Gas composition—Capture phase: CO2 diluted in nitrogen (ideal condition), CO2 diluted in nitrogen saturated with 4% of water vapour (effect of water), CO2 diluted in nitrogen with 4% of oxygen (effect of oxygen) and CO2 diluted in nitrogen with 5% of oxygen and 4% of water (realistic condition). Gas hourly space velocity (GHSV)—1620 mL gcat−1 h−1. Reduction phase: Pure hydrogen with GHSV of 3900 mL gcat−1 h−1. The CCR period length was 215 s, i.e. 107.5 s for CO2 capture and reduction phase.”