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Na+ and K+-Exchanged Zirconium Phosphate (ZrP) as High-Temperature CO2 Adsorbents

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In this contribution, the high-temperature CO2 capture performance of zirconium phosphates (ZrPs) and their cation exchanged forms were investigated for the first time. Two phases of ZrPs, i.e., α-ZrP and γ-ZrP and K+ (or Na+) exchanged α-ZrP were characterized in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermal gravimetric analysis (TGA). After K+ or Na+ exchange of α-ZrP (α-ZrP-K or α-ZrP-Na), the interlayer distance of the corresponding ion exchanged α-ZrP was increased from 7.6 Å to 9.0 and 8.4 Å, respectively. γ-ZrP showed a higher CO2 capture capacity (0.09 mmol/g) than α-ZrP (0.06 mmol/g) at 350 °C. The CO2 capture capacity of K+ and Na+ exchangedα-ZrPs was 0.13 and 0.14 mmol/g, respectively, at 350 °C. As increasing the adsorption temperature from 350 to 550 °C, the CO2 capture capacity slightly increased from 0.13 to 0.15 mmol/g. Our result suggested that K+ or Na+ exchange of α-ZrP could be a good candidate for CO2 capture in the temperature range of 400–500 °C, enabling the sorption enhanced hydrogen production processes more viable.
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Keywords: CATION-EXCHANGE; CO2 CAPTURE; GLOBAL WARMING; SORPTION ENHANCED HYDROGEN PRODUCTION; ZIRCONIUM PHOSPHATES

Document Type: Research Article

Publication date: 01 May 2013

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