| Pore structure of new composite adsorbent SiO_2·_xH_2O· yCaCl_2 with high uptake of water from air |
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| 引用本文： | 刘业凤,王如竹.Pore structure of new composite adsorbent SiO_2·_xH_2O· yCaCl_2 with high uptake of water from air[J].中国科学E辑(英文版),2003,46(5). |
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| 作者姓名： | 刘业凤 王如竹 |
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| 作者单位： | Institute of Refrigeration and Cryogenics，Shanghai Jiao Tong University，Shanghai 200030，China，Institute of Refrigeration and Cryogenics，Shanghai Jiao Tong University，Shanghai 200030，China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家优秀青年学者奖励计划，教育部高校优秀青年教师资助计划 |
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| 摘 要： | The adsorption/desorption property of adsorbent is crucial to the performance and efficiency of a system of extracting water from atmosphere. Several kinds of adsorbent can adsorb water vapor in air, such as molecular sieve and silica gel. But their equilibrium uptake is not high. The authors have prepared a new composite adsorbent——SiO2·xH2O·yCaCl2, which is composed of macro-porous silica gel and calcium chloride. The preparation process is as follows: immerge macro-porous silica gel …
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Pore structure of new composite adsorbent SiO2·xH2O·yCaCl2 with high uptake of water from air |
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| LIU Yefeng & WANG Ruzhu Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai ,China.Pore structure of new composite adsorbent SiO2·xH2O·yCaCl2 with high uptake of water from air[J].Science in China(Technological Sciences),2003,46(5). |
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| Authors: | LIU Yefeng & WANG Ruzhu Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai China |
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| Affiliation: | Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200030, China |
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| Abstract: | A new composite adsorbent SiO2@xH2O@yCaCl2 which is composed of macro-porous silica gel and calcium chloride is introduced. In order to analyze its adsorption theory, adsorption and desorption isotherms, BET surface areas, pore volumes and average pore diameters of macro-porous silica gel and four composite adsorbent samples with different CaCl2 content are measured using SEM and Asap2010 apparatus. From the adsorption isotherms, desorption isotherms and lag loops, it can be deduced that the main pore structure in macro-porous silica gel and the new composite adsorbent have two shapes: taper with one top open and taper or hyperbolic taper with both ends open. Based on the analysis of pore diameter distribution and lag loop, a sketch map showing calcium chloride filled in pore of macro-porous silica gel is presented. The adsorption isotherms at 25℃ are measured. Experimental results show that the new composite adsorbent can adsorb more water than common adsorbents (macro-porous silica gel, micro-porous silica gel and synthetic zeolite 13X). In the light of the results of pore structure, adsorption isotherms and lyolysis phenomenon are analyzed. |
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| Keywords: | composite adsorbent lag loop pore structure pore diameter distribution adsorption isotherm |
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