Binary liquid doping of Na/K with various molar ratios into lithium orthosilicate
(Li3.92NaxKySiO4) were synthesized by citric acid-assisted sol-gel methods. The CO2 sorption capacity
of Li3.92NaxKySiO4 was investigated by TG analysis under a gas stream containing 50% CO2 and 50%
N2 in a wide range from room temperature to 900 0C. Results indicated the sorption of CO2 for the
different Na/K doping lithium orthosilicate occurred between 480-700 0C and the maximum sorption of CO2 was obtained
at approximately 700 0C. The optimum ratio of binary doping of Na/K into lithium orthosilicate was determined to be 1:1
(Li3.92Na0.04K0.04SiO4) and the maximum sorption of CO2 may attain up to 30.7% (g/g) under the condition of optimum
Na/K doping ratio, implying synergetic enhancement effect of Na and K elements on doping vacancies into the Li4SiO4
lattice may enhance the CO2 sorption capacity.
Keywords: Citric acid-assisted sol-gel, CO2 capture, heterogeneous catalysis, lithium orthosilicate, Na/K doping, synergetic effect.
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