Impact of phase composition on water adsorption on inorganic hybrids “salt/silica”

Gordeeva, Larisa G.; Glaznev, I.S.; Savchenko, E. V.; Malakhov, V. V.; Aristov, Yu. I.

doi:10.1016/j.jcis.2006.05.009

Cited by 66 publications

(18 citation statements)

References 37 publications

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“…The reason is likely to be the strong ion-exchange interaction between salt and silica during the impregnation of LiCl solution. This interaction may result in the formation of salt surface complexes (Gordeeva et al, 2006), change of surface morphology and increase of pore volume.…”

Section: Texture Propertiesmentioning

confidence: 99%

Development and characterization of silica gel–LiCl composite sorbents for thermal energy storage

Wang

et al. 2014

Chemical Engineering Science

127

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Section: Texture Propertiesmentioning

confidence: 99%

Development and characterization of silica gel–LiCl composite sorbents for thermal energy storage

Wang

et al. 2014

Chemical Engineering Science

127

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“…Actually, the confinement of inorganic salts to mesopores of various matrices appeared to affect essentially the physico-chemical properties of these salts, namely, the melting point of the salt crystalline hydrates , the sorption equilibrium with water vapor (Aristov et al 1996a(Aristov et al , 1996bGordeeva et al 2002), the phase composition of the salt (Gordeeva et al 1997), etc. It can occur due to either the dispersion of the confined salt to nano-sized particles, which have increased surface energy respect to the bulk salt, or due to the interaction between the salt and the matrix surface.…”

Section: Introductionmentioning

confidence: 99%

Sorption equilibrium of methanol on new composite sorbents “CaCl2/silica gel”

et al. 2007

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This paper presents experimental data on methanol sorption on new composite sorbents which consist of mesoporous silica gels and calcium chloride confined to their pores. Sorption isobars and XRD analysis showed the formation of a solid crystalline solvate CaCl 2 ·2MeOH at low methanol uptake, while at higher uptake the formation of the CaCl 2 -methanol solution occurred. The solution confined to the silica pores showed the sorption properties similar to those of the CaCl 2 -methanol bulk solution. Calorimetric and isosteric analyses showed that the heat of methanol sorption depends on the methanol uptake, ranging from 38 ± 2 kJ/mol for the solution to 81 ± 4 kJ/mol for the solid crystalline phase CaCl 2 ·2MeOH. The above mentioned characterizations allowed the evaluation of the methanol sorption and the energy storage capacities, clearly showing that the optimal applications of these new composite sorbents are the methanol removal from gaseous mixtures, heat storage and sorption cooling driven by low temperature heat.

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“…These sorption behaviors imply that calcium chloride in Composites Oxal773 and Sulf473 has amorphous phase. Gordeeva et al (2005Gordeeva et al ( , 2006 reported that the water sorption isotherm for crystalline calcium chloride in nanopores showed a stepwise pattern, but for amorphous salt the sorption isotherm became a linear shape. Composite Sulf773 with tricalcium aluminate poorly sorbs water vapor.…”

Section: Water Vapor Sorptionmentioning

confidence: 99%

Water Vapor Sorption Characteristics of Calcium Chloride-Anodized Alumina Composites

Suwa

Kumita

Noki

et al. 2016

J. Chem. Eng. Japan / JCEJ

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In this study, calcium chlorideanodized alumina composites were examined for water vapor sorption properties. Porous alumina host matrices for calcium chloride impregnation were prepared by anodizing aluminum plates in an oxalic acid bath or a sulfuric acid bath. CaCl2alumina composites were obtained through calcination of the anodic alumina film impregnated with CaCl2 solution at 473 or 773 K. XRD analyses indicated that the type of host matrix and the calcination temperature made an effect on crystal states of calcium chloride in the composite layer. The composite calcined at 473 K, of which host matrix was oxalic-acid anodized alumina film, contained calcium chloride anhydrate crystals. Water vapor sorption experiments showed that the composite with crystalline calcium chloride sorbed well water vapor, and its sorption isotherm had a shape similar to that of bulk CaCl2. Therefore, the water sorption behavior of the CaCl2alumina composite strongly depends on crystal states of calcium chloride in anodized alumina layer. IntroductionMetal salts such as calcium chloride, lithium chloride and calcium nitride have a high hygroscopic nature, and their sorption capacities of water vapor are larger than that of silica gel or zeolite. Water vapor sorption on metal salt contains a gas-solid reaction related to the formation of hydrates. According to the Gibbs's phase rule, the reaction between solid metal salt and water vapor is a monovariant system, that is, the sorption equilibrium can be determined by either the vapor pressure or the sorption temperature (Aristov, 2007). This property is desirable as working pair for sorption chillers. Many researchers have proposed to immobilize metal salts in porous materials such as silica gel (Aristov et al., 1996a), alumina (Sharonov and and expanded graphite (Fujioka et al., 2008) to ensure easy handling of the metal-salt particles and/or to enhance the heat and mass transfer rates in solid-sorbent beds.Aluminum is one of the most suitable materials for heat exchangers because of the high thermal conductance. If aluminum plates have the hygroscopic properties, they will be very attractive sorption materials that can be rapidly cooled and heated. In order to meet this requirement, we prepared aluminum plates with porous thin aluminum oxide films on both sides by anodizing in acidic baths, and then calcium chloride was deposited into pores of the films by a solution impregnation method in the previous works (Kumita

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Impact of phase composition on water adsorption on inorganic hybrids “salt/silica”

Cited by 66 publications

References 37 publications

Development and characterization of silica gel–LiCl composite sorbents for thermal energy storage

Development and characterization of silica gel–LiCl composite sorbents for thermal energy storage

Sorption equilibrium of methanol on new composite sorbents “CaCl2/silica gel”

Water Vapor Sorption Characteristics of Calcium Chloride-Anodized Alumina Composites

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