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首页> 外文期刊>Separation and Purification Technology >The effect of wall porosity and zeolite film thickness on the dynamic behavior of adsorbents in the form of coated monoliths
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The effect of wall porosity and zeolite film thickness on the dynamic behavior of adsorbents in the form of coated monoliths

机译：壁孔隙率和沸石膜厚度对涂层整料形式吸附剂动态行为的影响

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摘要

The effects of wall porosity, channel width distribution and zeolite film thickness on the performance of 400 and 1200 cells per square inch (cpsi) cordierite monoliths coated with zeolite X films with thicknesses of 1.5 and 2.5 μm were examined. To investigate the effect of wall porosity and restrict growth of zeolite to the external surface of the monolith channels, the macro pores in the walls of the 1200 cpsi cordierite monoliths were filled with colloidal tx-alumina particles. The adsorbents were characterized by Scanning Electron Microscopy (SEM), Mercury Intrusion Porosimetry (M1P) and carbon dioxide breakthrough experiments and a mathematical model describing the diffusion and adsorption in the system was fitted to the data. The model accounted for carbon dioxide uptake by filling the pores in the support by carbon dioxide gas and adsorption of carbon dioxide on cordierite, alumina and zeolite. The model indicates that the uptake of carbon dioxide by adsorption on cordierite is much slower than by pore filling and too slow to influence the very fast breakthrough experiments with monoliths without zeolite film that are over in less than 1 min. It was shown that the pores in the cordierite monolith result in dispersion by pore filling with carbon dioxide gas, not adsorption. The CO2 adsorption capacity of a 1200 cpsi monolith coated with a 2.5 μm film was 0.13 mmol/cm~3 adsorbent, which should be compared to the adsorption capacity of zeolite X beads, which is about 2.3 mmol/cm~3 adsorbent. To increase adsorption capacity of a non-porous zeolite coated monolith, film thickness could be increased. The model indicated that the film thickness could be increased up to about 10 μm without increasing the dispersion and thereby approach the adsorption capacity for beads. However, simulation of the whole cycle must be performed in order to find the optimum film thickness for a real cyclic process. This work has lead to better understanding of the role of the support porosity and pore size distribution and film thickness for coated monolith adsorbents.
机译：研究了壁孔隙率，通道宽度分布和沸石膜厚度对涂覆有厚度为1.5和2.5μm的沸石X膜的每平方英寸（cpsi）堇青石整料的400和1200孔性能的影响。为了研究壁孔隙率的影响并将沸石的生长限制在整料通道的外表面，在1200 cpsi堇青石整料的壁中的大孔中填充了胶体tx-氧化铝颗粒。通过扫描电子显微镜（SEM），水银压入孔隙率法（M1P）和二氧化碳穿透实验对吸附剂进行了表征，并将描述系统中扩散和吸附的数学模型拟合到数据中。该模型通过用二氧化碳气体填充载体中的孔并在堇青石，氧化铝和沸石上吸附二氧化碳来解决二氧化碳的吸收问题。该模型表明，堇青石吸附二氧化碳的吸收要比孔填充慢得多，并且太慢而无法影响在不到1分钟的时间内没有沸石膜的整料的快速突破实验。结果表明，堇青石整料中的孔通过用二氧化碳气体填充孔而不是吸附而导致分散。涂有2.5μm膜的1200 cpsi整料的CO2吸附能力为0.13 mmol / cm〜3吸附剂，应与沸石X珠的吸附能力为2.3 mmol / cm〜3吸附剂进行比较。为了增加无孔沸石涂覆的整料的吸附能力，可以增加膜厚度。该模型表明，膜厚度可以增加至约10μm，而不会增加分散度，从而接近珠的吸附能力。但是，必须进行整个循环的模拟，以便为实际循环过程找到最佳的膜厚。这项工作使人们更好地了解了涂层整料吸附剂的载体孔隙率和孔径分布以及膜厚的作用。

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