Morphological changes of pure micro- and nano-sized CaCO3 during a calcium looping cycle for CO2 capture

Luo, Cong, Shen, Qiuwen, Ding, Ning, Feng, Zhixiang, Zheng, Ying and Zheng, Chuguang (2012) Morphological changes of pure micro- and nano-sized CaCO3 during a calcium looping cycle for CO2 capture. Chemical Engineering and Technology, 35 3: 547-554. doi:10.1002/ceat.201000299


Author Luo, Cong
Shen, Qiuwen
Ding, Ning
Feng, Zhixiang
Zheng, Ying
Zheng, Chuguang
Title Morphological changes of pure micro- and nano-sized CaCO3 during a calcium looping cycle for CO2 capture
Formatted title
Morphological changes of pure micro- and nano-sized CaCO3 during a calcium looping cycle for CO2 capture
Journal name Chemical Engineering and Technology   Check publisher's open access policy
ISSN 0930-7516
1521-4125
Publication date 2012-03-01
Sub-type Article (original research)
DOI 10.1002/ceat.201000299
Volume 35
Issue 3
Start page 547
End page 554
Total pages 8
Place of publication Weinheim, Germany
Publisher Wiley
Collection year 2013
Language eng
Formatted abstract
Cyclic CO2 capture using CaO-based sorbents derived from commercial pure
micro-sized CaCO3 and nano-sized CaCO3 was investigated, focusing on the different
characteristics of carbonation conversions, carbonation rates, surface areas,
pore volumes, morphological changes, and microstrains of two sorbents during
high-temperature reactions. The results indicated that the CaO-based sorbent
derived from nano-sized CaCO3 (NC-CaO) provided higher carbonation
conversions and carbonation rates than the CaO-based sorbent derived from
micro-sized CaCO3 (MC-CaO) in the cyclic CO2 capture reactions. Furthermore,
NC-CaO retained its fast carbonation rate at the beginning of each cycle for several
tens of seconds. In contrast, the carbonation rate of MC-CaO diminished
with an increase in the cycle number. Unfortunately, NC-CaO sintered more
easily. Its grains, which were composed of numerous spherical nanocrystallites,
suffered from dramatic morphological changes during high-temperature reactions.
A mechanism of grain boundary migration was employed to explain the
sintering of CaO-based sorbent. The smaller crystallites were more susceptible to
be merged by the bigger crystallites during high-temperature reactions.
Keyword Calcium looping cycle
CO2 capture
Nano-sized particles
Combined catalyst
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Special Issue: Efficient Carbon Capture for Coal Power Plants

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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