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In-situ synthesis and performance of Aluminum fumarate MOF monolithic adsorbent for water adsorption bingqiong Tan, yanshu Luo, Xianghui Liang, Shuangfeng Wang, Xuenong Gao, Zhengguo Zhang, and Yutang Fang Ind. Eng. Chem. Res., Just Accepted Manuscript • DOI: 10.1021/acs.iecr.9b03172 • Publication Date (Web): 05 Aug 2019 Downloaded from pubs.acs.org on August 12, 2019
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Industrial & Engineering Chemistry Research
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In-situ synthesis and performance of Aluminum fumarate MOF
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monolithic adsorbent for water adsorption
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Bingqiong Tan a, Yanshu Luo a, Xianghui Lianga，Shuangfeng Wanga, Xuenong Gaoa,
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Zhengguo Zhanga, Yutang Fanga,* Key Laboratory of Enhanced Heat Transfer and Energy Conservation, The Ministry of
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a
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Education, School of Chemistry and Chemical Engineering, South China University of
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Technology, Guangzhou 510640, China.
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* Corresponding Author. Tel: 13318819891
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Email address
[email protected] (Bingqiong Tan)
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[email protected](Yanshu Luo)
[email protected] (Xianghui Liang)
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[email protected] (Shuangfeng Wang)
[email protected] (Xuenong Gao)
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[email protected] (Zhengguo
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Fang)
Zhang)
[email protected] (Yutang
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Abstract: The monolithic adsorbent is a key unit for adsorptive rotary dehumidification
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system. It is usually prepared by dip-coating adsorbent on glass fiber paper. In this study,
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a new in-situ synthesis strategy of Aluminum fumarate MOF (A520) monolithic
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adsorbent based on glass fiber paper was introduced. The influences of the mole ratio of
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fumaric acid to H2O, the reaction temperature and time on the crystal phase, pore
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structure and adsorption performance of the monolithic adsorbent were systematically
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discussed. The morphology of the adsorbent was characterized by Scanning Electronic
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Microscopy (SEM). And the adsorption and desorption performances were evaluated by
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DVS water adsorption and Differential Thermogravimetric Analysis (DTG). The results
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showed that under the conditions of the mole ratio of fumaric acid to H2O of 0.02,
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reaction temperature of 50℃ and the reaction time of 60 min, the obtained A520
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monolith exhibited the highest BET surface area (740.15m2 g-1) and high adsorption
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capacity (0.3906 gg-1). The monolithic adsorbent carries about 76% A520 powder with
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facile fabrication process, high adsorption capacity, rapid adsorption rate and low
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desorption temperature providing a guidance for the fabrication of highly efficient
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desiccant dehumidification wheel.
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Keywords: Adsorptive rotary wheel dehumidification; Aluminum fumarate MOF;
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In-situ synthesis; Monolithic adsorbent; Glass fiber paper;
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1.Introduction
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With the increasing demand for energy saving, there is a need for developing the
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techniques that can efficiently employ low-grade thermal energy in recent years
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Desiccant dehumidification technology has broad application prospects, because it is a
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low-grade thermal drive device, and can be used in both dehumidification applications
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and air conditioning industry 5. Desiccant wheel, also known as monolithic adsorbent, is
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widely recognized as the most critical part in the desiccant dehumidification system,
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both in terms of cycle performance and system cost 6. The desiccant wheel is commonly
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composed of substrate and adsorbent. The substrate usually employs inorganic fiber
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paper with high void content and high temperature resistance, such as ceramic fiber
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paper and glass fiber paper, etc. As for the adsorbent, the application of advanced
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desiccant materials which have high adsorption capacity, low desorption temperature
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and low cost is particularly popular.
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A variety of sorbents such as LiCl, silica gel and zeolite are commonly used in desiccant
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wheel. LiCl has the advantage of high adsorption capacity 7. However, this type of
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desiccant is prone to overflow from the wheel due to the lyolysis phenomenon and
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cause damage to surrounding equipment when the desiccant is allowed to reach
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saturation. Another advanced desiccant is the use of solid adsorbents such as silica gel
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and zeolite. They are chemically stable and do not deliquesce. Although zeolite has the
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advantages of high adsorption rate and large adsorption capacity, the high affinity
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towards water, conversely, leads to high regeneration temperature (>200 ℃ ) 8. Silica
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gel has a linear-shaped water adsorption isotherm and proper regeneration temperature 3
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(below 150 ℃ )9. However, the main drawback of silica gel is the low adsorption
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capacities at a relatively low partial pressure range (e.g., 0.1
