A study on vermiculite-based salt mixture composite materials for low-grade thermochemical adsorption heat storage

Chen, Ziwei; Zhang, Yanan; Zhang, Yong; Su, Yuehong; Riffat, Saffa

doi:10.1016/j.energy.2023.127986

Cited by 16 publications

(8 citation statements)

References 61 publications

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“…From the first studies on the manufacture of such sorbents by impregnating a porous matrix with hygroscopic salts [19,20], numerous combinations of salts and porous carriers with enhanced sorption capacity have been developed. Active components include calcium and lithium chlorides, lithium bromide, magnesium and sodium sulfates; porous matrices include silica gels, aluminum oxide, synthetic carbon materials, vermiculite, and zeolites [24][25][26][27][28][29]. As proved, this is an effective way to create innovative materials with specified sorption properties.…”

Section: Introductionmentioning

confidence: 99%

“…Encapsulated sorbents represent a new level of composite materials with enhanced physicochemical properties and performance characteristics. Similarly to two-component salt-in-porous-matrix composites [19][20][21][22][23][24][25][26][27][28][29], Yang et al [32] developed a solid sorbent obtained by encapsulating the hygroscopic salt of lithium chloride (LiCl) inside microsized hollow-structured SiO 2 , which demonstrated a record high water vapor sorption capacity.…”

Section: Introductionmentioning

confidence: 99%

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The Preparation and Contact Drying Performance of Encapsulated Microspherical Composite Sorbents Based on Fly Ash Cenospheres

Fomenko,

Anshits,

Solovyov

et al. 2024

Molecules

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Sorption technologies are essential for various industries because they provide product quality and process efficiency. New encapsulated microspherical composite sorbents have been developed for resource-saving contact drying of thermolabile materials, particularly grain and seeds of crops. Magnesium sulfate, known for its high water capacity, fast sorption kinetics, and easy regeneration, was used as an active moisture sorption component. To localize the active component, porous carriers with an accessible internal volume and a perforated glass–crystalline shell were used. These carriers were created by acid etching of cenospheres with different structures isolated from fly ash. The amount of magnesium sulfate included in the internal volume of the microspherical carrier was 38 wt % for cenospheres with ring structures and 26 wt % for cenospheres with network structures. Studies of the moisture sorption properties of composite sorbents on wheat seeds have shown that after 4 h of contact drying the moisture content of wheat decreases from 22.5 to 14.9–15.5 wt %. Wheat seed germination after sorption drying was 95 ± 2%. The advantage of composite sorbents is the encapsulation of the desiccant in the inner volume of perforated cenospheres, which prevents its entrainment and contamination and provides easy separation and stable sorption capacity in several cycles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Preparation and Contact Drying Performance of Encapsulated Microspherical Composite Sorbents Based on Fly Ash Cenospheres

Fomenko,

Anshits,

Solovyov

et al. 2024

Molecules

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“…A number of studies have considered tailoring the sorbent properties in accordance with the requirements of the particular application by embedding two salts into matrix pores [26][27][28]. In [27], it was shown that by partially substituting MgSO 4 by MgCl 2 , the relative humidity over the mixture was changed.…”

Section: Introductionmentioning

confidence: 99%

Composites Based on CaCl2-CaBr2 Salt System for Adsorption Applications: Designing the Optimal Sorbent for Gas Drying and Air Conditioning

Grekova,

Solovyeva,

Cherpakova

et al. 2023

Separations

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The different adsorption applications require the development of sorbents with predetermined properties. One of the ways for fine tuning the adsorption properties of the material is using a binary salt system as an active sorbing component. The aim of this work is to conduct a precision investigation of thermodynamic data on the sorption equilibrium of composite sorbents “(CaCl2 + CaBr2) confined to the silica gel pores” with water vapour. The isotherms and isosteres (at an uptake of N = 1.5 and 3.6 mole/mole) of water sorption on the composites were measured. It was shown that at a fixed temperature, the composites based on solid solutions of CaCl2 in CaBr2 form complexes with water at a pressure that is dependent on the CaCl2/CaBr2 molar ratio. The isosteric enthalpy and entropy of water sorption (ΔH = −48 ± 3 kJ/mol ΔS = −108 ± 2 J/(mol·K)) at N = 3.6 mole/mole were midway between the same parameters for composites on the base of the pure salts CaCl2 and CaBr2. The novelty of this work is in the design of sorbents optimized for air conditioning in hot climates and air drying cycles. It was shown that the use of the binary CaCl2 + CaBr2 system confined to the silica pores can be an effective tool for designing innovative materials with predetermined properties.

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“…To ensure the cost-effectiveness of TCS material, the raw products used in SIM formulations are often cheap, (CaCl 2 (0.2-2 USD/KG) [12] and vermiculite (0.2-44 USD/KG) [18], and its regeneration is conducted at relatively low temperatures <140 • C [19]. In salt hydrate TCM, the energy capture and release occurs from the dehydration and hydration of hygroscopic salts, such as MgSO 4 CaCl 2 , Ca(NO 3 ), Li (NO 3 ), Li Br, or composite mixtures, [11,20]. During the charging of the material, energy is used to desorb water from hydrated salt crystals, this process is essentially an endothermic reaction and stores thermal energy in the form of ionic bonds [9,16].…”

Section: Introductionmentioning

confidence: 99%

Cycling Stability of Calcium-Impregnated Vermiculite in Open Reactor Used as a Thermochemical Storage Material

Sullivan,

Griffiths,

Jewell

et al. 2023

Energies

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Recent research into thermochemical storage (TCS) materials has highlighted their promising potential for seasonal building heating, through energy capture and release during dehydration and hydration cycling. A common TCS material used throughout this investigation was calcium chloride (CaCl2)-impregnated vermiculite-based salt in matrix (SIM). This material was assessed for its robustness during charging and discharging cycles to assess its behavior and in terms of energy stability and chemical stability; the results of which showed consistent volumetric energy density and maximum temperature changes over seven cycles. The calcium SIM did, however, show a decline in leachable Ca content, which was presumed to be a result of stabilization within the vermiculite, and chloride concentration showed little change over the course of the study. Real-time visualization using a high-resolution microscope of calcium SIM particles showed a salt phase change and migration of liquid salt into the valleys of the lamella. A novel cobalt chloride (CoCl2) SIM was used to visualize the hydration path across the particle, through distinct color changes depending on hydration state. The results indicated that the topography of the vermiculite played a significant role in the passive hydration modeling.

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A study on vermiculite-based salt mixture composite materials for low-grade thermochemical adsorption heat storage

Cited by 16 publications

References 61 publications

The Preparation and Contact Drying Performance of Encapsulated Microspherical Composite Sorbents Based on Fly Ash Cenospheres

The Preparation and Contact Drying Performance of Encapsulated Microspherical Composite Sorbents Based on Fly Ash Cenospheres

Composites Based on CaCl2-CaBr2 Salt System for Adsorption Applications: Designing the Optimal Sorbent for Gas Drying and Air Conditioning

Cycling Stability of Calcium-Impregnated Vermiculite in Open Reactor Used as a Thermochemical Storage Material

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