期刊
ACS APPLIED NANO MATERIALS
卷 4, 期 10, 页码 10969-10975出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c02428
关键词
CaO-MgO; self-sustained combustion; porous nanostructures; monolith; CO2 capture
资金
- DST-FIST
Monolithic porous nanostructures of CaO-MgO composites were synthesized by a rapid self-sustained combustion reaction, showing enhanced cycle stability and CO2 capture capacity with the addition of MgO.
Monolithic porous nanostructures of CaO-MgO composites were synthesized by a rapid self-sustained combustion reaction of molded pellets made of a mixture of nitrate salts of calcium and magnesium, urea, and starch. Urea is the fuel, and starch acts as a binder and a removable in situ template leading to porous monoliths. The synthesis is rapid, single-step, and solvent-free. In addition, the products retained a small quantity (1-2%) of carbon formed from starch. Porous monoliths were probed for high-temperature (650 degrees C) CO2 capture at atmospheric pressure in a 20% CO2 gas stream. While the pristine CaO porous nanostructure captured 76.8 mass % of CO2 initially, it retained only a capture of 22 mass %, equivalent to 28% carbonation efficiency, after 100 carbonation-decarbonation cycles. The CaO-MgO porous nanostructures with varied amounts of MgO (10-40 mol %) exhibit CO2 capture capacities of 67-51 mass % of the sorbent. CaO80-MgO20 porous nanostructures captured 61.6 mass % of CO2 and retained 84.6% (52.1 mass % of CO2) of its initial capacity after 100 carbonation-decarbonation cycles. Thus, the hetero-oxide porous nanostructures exhibit enhanced cycle stability in addition to high CO2 capture capacity, repressing the sintering-induced limitation of porous CaO. The high carbonation efficiency and cycling stability of the porous nanostructures as CO2 sorbents are attributed to the synergistic combination of large surface area, a porous network, and an inert MgO stabilizer.
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