Inorganic composite sorbents for water vapor sorption: A research progress

Yuan, Yanping; Zhang, Haiquan; Yang, Fan; Zhang, Nan; Cao, Xiaoling

doi:10.1016/j.rser.2015.10.069

Cited by 72 publications

(28 citation statements)

References 95 publications

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“…They are also unstable and decompose at high temperature (e.g. MgCl 2 releasing HCl above 190 °C and Ca(NO 3 ) 2 releasing oxygen and carcinogenic nitrites above 132 °C). SG is a very hydrophilic material, but water is totally desorbed at 150 °C and it starts to decompose above 200 °C .…”

Section: Introductionmentioning

confidence: 99%

“…MgCl 2 releasing HCl above 190 °C and Ca(NO 3 ) 2 releasing oxygen and carcinogenic nitrites above 132 °C). SG is a very hydrophilic material, but water is totally desorbed at 150 °C and it starts to decompose above 200 °C . Concerning AC, clays, and mesoporous materials, they are typically already regenerated at low temperatures of 150 °C, 120 °C, and less than 100 °C, respectively, and have usually more affinity to organic sorbates.…”

Section: Introductionmentioning

confidence: 99%

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Hydrophilic zeolite sorbents for In‐situ water removal in high temperature processes

et al. 2017

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An attractive approach to reduce anthropogenic emission of carbon dioxide (CO2) would be to valorize it into value‐added products (e.g. alcohols or dimethylether) by chemical recycling. However, in most of these important reactions, water is produced as a byproduct that limits CO2 conversion thermodynamically and can lead to the deactivation of catalysts. Water removal in sorption‐enhanced reaction process (SERP) would allow the overcoming of these drawbacks and several zeolites (SOD, LTA, and FAU) have been selected to assess their potential to adsorb water in‐situ at high temperatures. This work aims to study the water adsorption capacity and kinetics in a large temperature range of 25–250 °C and evaluate the potential of the selected adsorbents for in‐situ water removal in the reverse water gas shift (RWGS) reaction. For all zeolites, the water uptake showed an important decrease at higher temperatures but the capacity at 250 °C was still significant. While the poor adsorption kinetics of SOD limit its use, FAU‐13X powder gave better results than LTA‐4A, which were confirmed by a more important increase of CO concentration at the exit of the reactor for the RWGS reaction. Transient adsorption data obtained in this study were fitted by a double stretched equation and the kinetic constants were determined. These results are essential to model and design an efficient SERP process and determine the optimal reaction conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrophilic zeolite sorbents for In‐situ water removal in high temperature processes

et al. 2017

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“…5(a–c), the adsorption processes in these composites can be divided into four parts: (1) adsorption by the PEG coating; (2) diffusion of water molecules into the PEG bulk material; (3) aggregation of water molecules at the PEG/matrix interface; and (4) diffusion of water molecules into the matrix. Our previous studies3334 have shown that organic polyvinylpyrrolidone (PVP) can adsorb water vapor to form high-moisture regions even at low relative humidity. Furthermore, addition of CaCl 2 as a chemical adsorbent enhanced the diffusion rate of water from such high-moisture regions rather than from air, enhancing the apparent rate of adsorption for the composite material.…”

Section: Resultsmentioning

confidence: 99%

Core-shell microstructured nanocomposites for synergistic adjustment of environmental temperature and humidity

Zhang

Yuan

Zhang

et al. 2016

Sci Rep

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The adjustment of temperature and humidity is of great importance in a variety of fields. Composites that can perform both functions are prepared by mixing phase change materials (PCMs) with hygroscopic materials. However, the contact area between the adsorbent and humid air is inevitably decreased in such structures, which reduces the number of mass transfer channels for water vapor. An approach entailing the increase in the mass ratio of the adsorbent is presented here to improve the adsorption capacity. A core-shell CuSO4/polyethylene glycol (PEG) nanomaterial was developed to satisfy the conflicting requirements of temperature control and dehumidification. The results show that the equilibrium adsorption capacity of the PEG coating layer was enhanced by a factor of 188 compared with that of the pure PEG powder. The coating layer easily concentrates vapor, providing better adsorption properties for the composite. Furthermore, the volume modification of the CuSO4 matrix was reduced by 80% by the PEG coated layer, a factor that increases the stability of the composite. For the phase change process, the crystallization temperature of the coating layer was adjusted between 37.2 and 46.3 °C by interfacial tension. The core-shell CuSO4/PEG composite reported here provides a new general approach for the simultaneous control of temperature and humidity.

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“…Thereafter, the sorption curve ascended monotonically, indicating the formation of an aqueous solution of the salt and reaching a maximum water uptake of 1.93 gwater/gadsorbent at an RH of 90%. [80,81] Interestingly, a hysteresis loop at low pressures (P/P0 = 0.10-0.16) was observed in the desorption branch due to the structural changes in the transition from CaCl2⋅2H2O hydrate to CaCl2⋅0.33H2O hydration. A hypothetical mechanism for the water sorption was suggested and the following steps take place: the anhydrous CaCl2 particles confined in the micropores of UiO-66 and/or in the interparticular voids of the superstructures adsorb water and transform into crystalline CaCl2⋅0.33H2O.…”

Section: Functionalized Mofs With Composite Materialsmentioning

confidence: 99%

Tunable Metal-Organic Frameworks for Heat Transformation Applications

Chaemchuen

Xiao

Klomkliang

et al. 2018

Preprint

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Metal-Organic Frameworks (MOFs) are a subclass of porous materials that have unique properties such as varieties of structures from different metals and organic linkers, tunable porosity from a structure or framework design, etc. Moreover, modification/functionalization of the material structure could optimize the material properties and demonstrate high potential for a selected application. MOF materials exhibit exceptional properties and make these materials widely applicable including in energy storage and heat transformation applications. This review aims to give a broad overview of MOFs and their development as adsorbent materials having the potential for heat transformation applications. We summarize current investigations, developments, and possibilities of metal-organic frameworks (MOFs) especially the tuning of the porosity and hydrophobic/hydrophilic design required for this specific application. These materials applied as adsorbent are promising in the thermal driven adsorption for heat transformation using water as working fluid and related application.

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Inorganic composite sorbents for water vapor sorption: A research progress

Cited by 72 publications

References 95 publications

Hydrophilic zeolite sorbents for In‐situ water removal in high temperature processes

Hydrophilic zeolite sorbents for In‐situ water removal in high temperature processes

Core-shell microstructured nanocomposites for synergistic adjustment of environmental temperature and humidity

Tunable Metal-Organic Frameworks for Heat Transformation Applications

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