Journal
FUEL
Volume 127, Issue -, Pages 94-100Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2013.08.004
Keywords
CO2 capture; Sol-gel; Calcium oxide; Nano-structured materials; ZrO2
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Funding
- Swiss National Science Foundation (SNF) [200021_135457/1]
- Swiss National Science Foundation (SNF) [200021_135457] Funding Source: Swiss National Science Foundation (SNF)
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We report the synthesis of CaO-based, ZrO2-stabilized CO2 sorbents using a sol-gel technique. In addition, the influence of different synthesis parameters, i.e. the calcium precursor, the condensation time and the ratio of Ca2+ to Zr4+ on the morphology and the CO2 uptake of the materials was evaluated. The morphology and the chemical composition of the materials were characterized using X-ray diffraction, N-2 physisorption and scanning electron microscopy whereas the CO2 uptake of the materials was determined using a thermogravimetric analyzer and a packed bed reactor. After 90 cycles of the repeated calcination and carbonation reactions, the CO2 uptake of the best sorbent was 0.34 g CO2/g sorbent exceeding the performance of the reference limestone by 160%. The favorable CO2 capture characteristics of the synthetic CO2 sorbent were attributed to the formation of a finely dispersed, high Tammann temperature calcium zirconate framework, which minimized thermal sintering. (C) 2013 Elsevier Ltd. All rights reserved.
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