High Pressure Adsorption of CO2 and CH4 on Zr-MOFs

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• 作者：Jasmina H. Cavka ; Carlos A. Grande ; Giorgia Mondino ; Richard Blom
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：53
• 期：40
• 页码：15500-15507
• 全文大小：443K
• ISSN：1520-5045

文摘

Adsorption equilibrium of CO₂ and CH₄ at three different temperatures was measured on three isoreticular Zr-MOFs: Zr(1,4-BDC) (UiO-66), Zr(4,4鈥?BPDC) UiO-67, and Zr(2,6-NDC) (DUT-52). Adsorption equilibrium data was measured at 298, 313, and 343 K up to 30 bar for CO₂ and 80 bar for CH₄. The three adsorbents have increasing surface areas, pore volumes, and pore sizes in the order UiO-66 < DUT-52 < UiO-67. The maximum CO₂ and CH₄ loading and selectivity follow the same trend. The relatively low isosteric heats of adsorption of CO₂ for the three adsorbents indicate potential application at high partial pressures of CO₂ in so-called precombustion schemes. Since equilibrium selectivity was higher for UiO-67, adsorption kinetics of pure gases was also measured in this adsorbent. Diffusion of both molecules is very fast, allowing the use of equilibrium theory for estimation of process performance of this adsorbent.