变色硅胶与ZSM-5沸石分子筛的吸附脱附特性

doi:10.16085/j.issn.1000-6613.2015.06.036

化工进展 ›› 2015, Vol. 34 ›› Issue (06): 1730-1736.DOI: 10.16085/j.issn.1000-6613.2015.06.036

变色硅胶与ZSM-5沸石分子筛的吸附脱附特性

辛凤, 苑中显, 王文超

北京工业大学环境与能源工程学院, 北京 100024

收稿日期:2014-11-13 修回日期:2014-12-28 出版日期:2015-06-05 发布日期:2015-06-05
作者简介:辛凤(1988—),女,硕士研究生。联系人:苑中显,教授。E-mail:zxyuan@bjut.edu.cn。
基金资助:
国家自然科学基金项目(51276005)。

Adsorption and desorption characteristics of allochroic silica gel and ZSM-5 zeolite to water

XIN Feng, YUAN Zhongxian, WANG Wenchao

Beijing University of Technology, College of Environmental and Energy Engineering, Beijing 100024, China

Received:2014-11-13 Revised:2014-12-28 Online:2015-06-05 Published:2015-06-05

摘要/Abstract

摘要： 针对吸附材料在太阳能吸附空调系统中的应用, 对变色硅胶和ZSM-5沸石对水蒸气的吸附脱附特性进行了实验研究。结果表明, 在一定温度下, 两种吸附材料对水蒸气的吸附速率随相对湿度增大而增加, 但增加幅度逐渐减小。环境温度对材料的吸附脱附性能有重要影响, 低温下易吸附, 高温时易脱附。温度升高, 材料的吸附脱附速率增加, 但平衡吸附量降低, 平衡脱附百分比升高。比较两种吸附材料的吸附特性发现, ZSM-5沸石具有较快的吸附速率, 但是其平衡吸附量低于变色硅胶。与变色硅胶的渐近线型吸附等温线不同, ZSM-5沸石的吸附等温线呈S型。比较两种材料的脱附特性发现, 在温度低于100℃时, ZSM-5沸石的脱附百分比大于变色硅胶。此外ZSM-5沸石能够在高温下进行脱附, 而变色硅胶在高温环境下会失去结晶水而变质, 因此脱附温度必须控制在120℃以下。

关键词: 变色硅胶, ZSM-5沸石, 吸附量, 脱附

Abstract: For application in solar cooling system, the adsorption and desorption characteristics of the allochroic silica gel and ZSM-5 zeolite to water vapor have been investigated experimentally. The result has revealed that the adsorption rate increases with the humidity of the air at a given temperature, but the rate increment gets small gradually as the humidity increases. Ambient temperature impacts the adsorption rate seriously. The material tends to adsorb easily at low temperature and to desorb easily in high temperature. As temperature increases, the equilibrium adsorption concentration of material declines though the adsorption rate increases. In comparison, the adsorption rate of ZSM-5 zeolite is higher but its equilibrium adsorption concentration is lower in contrast to allochroic silica gel. The adsorption isotherm of silica gel is exponential and that of ZSM-5 zeolite shows an S-shape. As to the desorption characteristic, the result showed that ZSM-5 zeolite had desorbed faster than silica gel when temperature is lower than 100℃. In addition, ZSM-5 zeolite can desorb perfectly at a higher temperature while silica gel must desorb at the temperature less than 120℃, because a high temperature will cause silica gel lose its crystal water insides and fail to desorb.

Key words: allochroic silica gel, ZSM-5 zeolite, adsorption capacity, desorption

中图分类号:

TK511⁺.3

辛凤, 苑中显, 王文超. 变色硅胶与ZSM-5沸石分子筛的吸附脱附特性[J]. 化工进展, 2015, 34(06): 1730-1736.

XIN Feng, YUAN Zhongxian, WANG Wenchao. Adsorption and desorption characteristics of allochroic silica gel and ZSM-5 zeolite to water[J]. Chemical Industry and Engineering Progree, 2015, 34(06): 1730-1736.

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变色硅胶与ZSM-5沸石分子筛的吸附脱附特性

Adsorption and desorption characteristics of allochroic silica gel and ZSM-5 zeolite to water

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