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 5.8% CO2 while the reaction temperature varied between 450 and 550 °C. 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, the studied temperatures have little impact on the ICCU performance in terms of the CO2 capture efficiency and CO2 conversion, especially when the experiments were carried out under dry conditions. The selectivity of CO was slightly enhanced with the increase of reaction temperature. This was due to the nature of the endothermic reaction of RWGS, which was favoured at higher temperatures. However, the range of temperature investigated in this work is quite narrow. 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 reaction temperature with 5.8% CO2. 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.”