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化工进展  2015 

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, PP. 1730-1736

Keywords: 变色硅胶,ZSM-5沸石,吸附量,脱附

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Abstract:

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。

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