Journal
FUEL PROCESSING TECHNOLOGY
Volume 177, Issue -, Pages 210-218Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2018.04.036
Keywords
Layered double hydroxides; Capsule-connected structure; CO2 capture; Kinetics; Methanol modification; Stability
Funding
- National Key R&D Program of China [2017YFB0603300]
- National Natural Science Foundation of China (NSFC) [21325626]
- Program for New Century Excellent Talents in University [NCET-13-0411]
- Program of Introducing Talents of Discipline to Universities [B06006]
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This work presents the synthesis of Ca-Al mixed oxides derived from Ca-Al-CO3 layered double hydroxides (LDHs), which were prepared using a low-saturated coprecipitation method at high constant pH. Compared to the high-saturated coprecipitation method, a better CO2 adsorption capacity and stability were obtained from the mixed oxides. This was attributed to the novel capsule-connected structure of LDHs nanoparticles, smaller crystal size of CaO, and uniform distribution of CaO and Al2O3. The effect of the coprecipitation temperature, Ca/Al ratio and methanol modification on the CO2 capture performance of Ca-Al mixed oxides was also investigated. The mixed oxides with 2:1 Ca/Al ratio modified by methanol showed a much greater stability with carbonation capacity of about 56.7 wt% after 30 carbonation/calcination cycles. A double exponential model was fitted to the CO2 adsorption curves, providing a good explanation for the disparity between CO2 uptakes with different Ca/Al ratios.
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