Effect of Cerium Oxide Doping on the Performance of CaO-Based Sorbents during Calcium Looping Cycles

A series of CaO-based sorbents were synthesized through a sol–gel method and doped with different amounts of CeO2. The sorbent with a Ca/Ce molar ratio of 15:1 showed an excellent absorption capacity (0.59 gCO2/g sorbent) and a remarkable cycle durability (up to 18 cycles). The admirable capture per...

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Bibliographic Details
Published in:Environmental science & technology 2015-04, Vol.49 (8), p.5021-5027
Main Authors: Wang, Shengping, Fan, Shasha, Fan, Lijing, Zhao, Yujun, Ma, Xinbin
Format: Article
Language:English
Subjects:
Adsorption
Aluminum
Calcium Compounds - chemistry
Carbon Dioxide - chemistry
Carbon Dioxide - isolation & purification
Cerium - chemistry
Environmental Restoration and Remediation
Grain size
Magnesium
Morphology
Oxides - chemistry
Sintering
Solid solutions
Sorbents
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Summary:A series of CaO-based sorbents were synthesized through a sol–gel method and doped with different amounts of CeO2. The sorbent with a Ca/Ce molar ratio of 15:1 showed an excellent absorption capacity (0.59 gCO2/g sorbent) and a remarkable cycle durability (up to 18 cycles). The admirable capture performance of CaCe-15 was ascribed to its special morphology formed by the doping of CeO2 and the well-distributed CeO2 particles. The sorbents doped with CeO2 possessed a loose shell-connected cross-linking structure, which was beneficial for the contact between CaO and CO2. CaO and CeO2 were dispersed homogeneously, and the existence of CeO2 also decreased the grain size of CaO. The well-dispersed CeO2, which could act as a barrier, effectively prevented the CaO crystallite from growing and sintering, thus the sorbent exhibited outstanding stability. The doping of CeO2 also improved the carbonation rate of the sorbent, resulting in a high capacity in a short period of time.
ISSN:0013-936X
1520-5851
DOI:10.1021/es5052843