Systems Design and Economic Analysis of Direct Air Capture of CO2 through Temperature Vacuum Swing Adsorption Using MIL-101(Cr)-PEI-800 and mmen-Mg2(dobpdc) MOF Adsorbents

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• 作者：Anshuman SinhaLalit A. Darunte ; Christopher W. JonesMatthew J. Realff ; Yoshiaki Kawajiri
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：January 25, 2017
• 年：2017
• 卷：56
• 期：3
• 页码：750-764
• 全文大小：667K
• ISSN：1520-5045

文摘

Direct air capture (DAC) removes CO₂ from the atmosphere and can therefore address sizable nonpoint sources emissions of CO₂ such as those from transportation. We propose a five-step temperature vacuum swing adsorption process for direct air capture using solid adsorbents coated as films on monolithic contactors using steam as the stripping agent during desorption. We perform a modeling study and economic assessment for DAC using two metal organic frameworks, MIL-101(Cr)-PEI-800 and mmen-Mg₂(dobpdc), for which we have experimentally demonstrated film growth on monolith structures. The results indicate minimum energy requirements, and cost estimates are 0.145 MJ/mol-CO₂ and $75–140/t-CO₂ for MIL-101(Cr)-PEI-800, and 0.113 MJ/mol-CO₂ and $60–190/t-CO₂ for mmen-Mg₂(dobpdc), respectively. The overall DAC cost is sensitive to adsorbent purchase cost and lifetime as well as cycle parameters such as adsorption and desorption times. We conclude that mmen-Mg₂(dobpdc) has better performance compared to MIL-101(Cr)-PEI-800 in terms of energy requirements because of its higher capacity and nonlinear isotherm.