期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 117, 期 34, 页码 17514-17520出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp4024316
关键词
-
资金
- Australian Government through its CRC Program
MgO sorbents doped with alkali-metal carbonates have been shown to exhibit improved sorption capacities at both low and moderate operating temperatures, compared to pure MgO sorbents. However, the mechanism of how alkali-metal carbonates enhance the CO, sorption is not well understood. Using in situ X-ray diffraction, TEM, and thermogravimetric analysis, we have shown that the cesium dopants in the Cs2CO3-doped MgO nanoparticle system do not simply act as a promoter in sorption of CO2, but rather as a reagent alongside MgO. A new mixed magnesium-cesium carbonate phase has been found to be responsible for the improved sorption capacity of the doped-MgO-based sorbents. On the basis of our findings, it is suggested that a higher sorption capacity may be achieved if cesium is uniformly dispersed throughout the MgO particles.
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