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MgO carbonation with and without steam

https://doi.org/10.1039/C2RA21428H

“When steam is omitted from the gas phase, MgO reacts only slightly as can be seen from Fig. 2, where temperature and weight data as a function of time for two comparative PTGA experiments are given. The difference between the two experiments was in the composition of the gas. One contained CO2 only, while the other contained 5% vol. H2O mixed with CO2. The total pressure and temperature were the same; 20 bar and 300 °C, respectively. The sudden drop in temperature (450 to 300 °C) marks the start of the experiment as (pressure dependent) carbonation becomes thermodynamically favourable at the lower temperature.”

 

Comparison between carbonation (300 °C, Ptot = 20 bar) in the absence (bottom) and presence of steam (5% vol.).
Fig. 2 Comparison between carbonation (300 °C, Ptot = 20 bar) in the absence (bottom) and presence of steam (5% vol.).

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