Nanoscale Structural Investigation of Cs2CO3-Doped MgO Sorbent for CO2 Capture at Moderate Temperature

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• 作者：Maoyuan Liu ; Christian Vogt ; Alan L. Chaffee ; Shery L. Y. Chang
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：August 29, 2013
• 年：2013
• 卷：117
• 期：34
• 页码：17514-17520
• 全文大小：422K
• 年卷期：v.117,no.34(August 29, 2013)
• ISSN：1932-7455

文摘

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 CO₂ 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鈥揷esium 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.