Enhanced of steam on CaO-based carbon capture

https://www.nature.com/articles/s41467-018-04794-5

“It has been reported that the diffusion of CO₂ is enhanced in the presence of steam, a typical impurity in a flue gas stream^54,55. Hence, we performed additional experiments using a mixture of N₂, CO₂ and steam (1.5–2 vol.%) during carbonation to assess the effect of steam on the new CO₂ sorbents (Supplementary Fig. 6). The presence of steam enhanced the apparent rate of CO₂ uptake significantly for both Ca85Mg15 and Ca80Mg20 and prevented an early transition to the diffusion-limited reaction stage. The total CO₂ uptake at the end of the 2nd carbonation reaction of Ca80Mg20 increased under wet conditions (i.e., 0.61 vs. 0.64 g_CO2/g_sorbent for dry vs. wet conditions, respectively), confirming the positive effect of steam on the performance of the sorbents.”