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A Facile Starch‐Assisted Sol–Gel Method to Synthesize K‐Doped Li2ZrO3 Sorbents with Excellent CO2 Capture Properties

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A facile starch‐assisted sol–gel method combined with freeze‐drying technique has been developed to synthesize K‐doped Li2ZrO3 sorbents. SEM, TEM, and XRD techniques have been applied to characterize the morphology and structure of the synthesized K‐doped Li2ZrO3 samples. The CO2 capture‐regeneration properties of the prepared K‐doped Li2ZrO3 sample were investigated using thermogravimetric analysis at different CO2 partial pressures. The K‐doped Li2ZrO3 synthesized using the starch‐assisted sol–gel method combined with the freeze‐drying technique shows excellent CO2 capture properties. At 823 K and a CO2 partial pressure of 0.25 bar, the uptake of CO2 reaches 22 wt% within 20 min, which is approximately 87% of the stoichiometric sorption capacity (25.3 wt%) of CO2 in the K‐doped Li2ZrO3 with a K:Li:Zr composition of 0.2:1.6:1 in molar ratio. Furthermore, the sorbent shows a good stability, confirmed using capture‐regeneration cycles.
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Document Type: Research Article

Publication date: 2012-05-01

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