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首页> 外文期刊>Environmental Science & Technology >CO_2 Capture from the Atmosphere and Simultaneous Concentration Using Zeolites and Amine-Grafted SBA-15
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CO_2 Capture from the Atmosphere and Simultaneous Concentration Using Zeolites and Amine-Grafted SBA-15

机译：使用沸石和胺接枝的SBA-15从大气中捕获CO_2并同时进行浓缩

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摘要

CO_2 capture from the atmosphere and concentration by cyclic adsorption-desorption processes are studied for the first time. New high microporosity materials, zeolite types Li-LSX and K-LSX, are compared to zeolite NaX and amine-grafted SBA-15 with low amine content Breakthrough performance showed low silica type X (LSX) to have the most promise for application in dry conditions and capable of high space velocities of at least 63 000 h~(-1) with minimal spreading of the CO_2 breakthrough curve. Amine-grafted silica was the only adsorbent able to operate in wet conditions, but at a lower space velocity of 1500 h~(-1) due to slower uptake rates. The results illustrate that the uptake rate is as important as the equilibrium adsorbed amount in determining the cyclic process performance. Li-LSX was found to have double the capacity of zeolite NaX at atmospheric conditions, also higher than all other reported zeolites. It is further demonstrated that by using a combined temperature and vacuum swing cycle, the CO_2 concentration in the desorption product is >90% for all adsorbents in pellet form. This is the first report of such high CO_2 product concentrations from a single cycle, using atmospheric air.
机译：首次研究了通过循环吸附-解吸过程从大气中捕获CO_2并进行浓缩。将新型高微孔率材料（Li-LSX和K-LSX型沸石）与NaX沸石和胺含量低的胺接枝SBA-15进行了比较。的条件，并具有至少63 000 h〜（-1）的高空速，并且CO_2穿透曲线的扩散极小。胺接枝的二氧化硅是唯一能够在潮湿条件下运行的吸附剂，但由于吸收速率较慢，因此在较低的空速（1500 h〜（-1））下可以运行。结果表明，在确定循环过程性能中，吸收速率与平衡吸附量一样重要。发现Li-LSX在大气条件下具有NaX沸石容量的两倍，也高于所有其他报道的沸石。进一步证明，通过组合使用温度和真空摆幅循环，对于粒状形式的所有吸附剂，解吸产物中的CO_2浓度均> 90％。这是使用大气从单一循环中获得如此高的CO_2产品浓度的第一份报告。

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  • 来源
    《Environmental Science & Technology》 |2011年第23期|p.10257-10264|共8页
  • 作者

    Nicholas R. Stuckert; Ralph T. Yang;

  • 作者单位

    Department of Chemical Engineering, University of Michigan, Ann Arbor Michigan 48105, United States;

    Department of Chemical Engineering, University of Michigan, Ann Arbor Michigan 48105, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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