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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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Document Type: Research Article

Publication date: May 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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