Theoretical framework to evaluate minimum desorption temperature for IUPAC classified adsorption isotherms

Muttakin, Mahbubul; Mitra, Sourav; Thu, Kyaw; Ito, Kazuhide; Saha, Bidyut Baran

doi:10.1016/j.ijheatmasstransfer.2018.01.107

Cited by 283 publications

(91 citation statements)

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“…Water vapor sorption isotherms are able to provide significant information about hydrophilic/hydrophobic behavior of these materials. For this purpose, values of water vapor adsorption at low P/P S would be compared [10][11][12][13][14]. When Type I, II, IV, or VI (according to the well-known classification [15]) water vapor adsorption isotherms are observed, it means that the surface under study is hydrophilic, while hydrophobic surfaces are characterized by Type III or V adsorption isotherms [11].…”

Section: Introductionmentioning

confidence: 99%

Water Vapor Adsorption by Some Manganese Oxide Forms

Rakitskaya

Truba

Dzhyga

et al. 2018

Colloids and Interfaces

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Manganese oxide forms prepared by different methods differ by their compositions, phase ratios in polyphase samples, and crystallite sizes (XRD and TEM characterization). Among the phases, tunnel-structured β-MnO2 (pyrolusite), α-MnO2 (cryptomelane), ε-MnO2 (akhtenskite), and β-Mn2O3 (bixbyite) have been identified. Water vapor sorption isotherms showed substantial differences in the affinities of water molecules to oxide surfaces of the manganese oxide forms under study. The parameters of the BET equation and pore size distribution curves have been calculated. The manganese oxide forms have mesoporous structures characterized by uniform and non-uniform pore sizes as well as by moderate hydrophilic behavior.

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Section: Introductionmentioning

confidence: 99%

Water Vapor Adsorption by Some Manganese Oxide Forms

Rakitskaya

Truba

Dzhyga

et al. 2018

Colloids and Interfaces

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“…As shown in Figure 2(c), the SEM image of PDMS@UiO-67-CF 3 SO 3 shows that it has a regular octahedron morphology with rough surface, which is similar to UiO-67-CF 3 SO 3 , suggesting that the PDMS@UiO-67-CF 3 SO 3 retains the original structure of UiO-67-CF 3 SO 3 . [14] The BET surface area of PDMS@UiO-67-CF 3 SO 3 is 1.12 × 10 3 m 2 g À 1 , which is smaller than that of UiO-67-CF 3 SO 3 (1.23 × 10 3 m 2 g À 1 ). [14] The BET surface area of PDMS@UiO-67-CF 3 SO 3 is 1.12 × 10 3 m 2 g À 1 , which is smaller than that of UiO-67-CF 3 SO 3 (1.23 × 10 3 m 2 g À 1 ).…”

mentioning

confidence: 88%

Fast Catalytic Esterification Using a Hydrophobized Zr‐MOF with Acidic Ionic Liquid Linkers

Zhao

Hedin

et al. 2020

ChemistrySelect

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A Zr-MOF with an acidic ionic liquid linker ([bpyH][CF 3 SO 3 ]) were externally hydrophobized with polydimethylsiloxane (PDMS) via a vapor deposition method (denoted as PDMS@UiO-67-CF 3 SO 3 ). The morphology of UiO-67-CF 3 SO 3 was well maintained after PDMS coating, and PDMS had little effect on the chemical properties of UiO-67-CF 3 SO 3 , while the hydrophobicity of the surface of UiO-67-CF 3 SO 3 was improved greatly as demonstrated by water contact angle measurement. The derived hydrophobized PDMS@UiO-67-CF 3 SO 3 exhibited excellent catalytic performance in the esterification of acetic acid and isooctyl alcohol, it only needed 4 h to reach the reaction equilibrium, while for UiO-67-CF 3 SO 3 , it was 18 h. The decrease in reaction time was mainly attributed to the accelerated the removal of water and isooctyl acetate, resulting the increase rate in the forward reaction. In addition, in the other esterification of acids and alcohols, PDMS@UiO-67-CF 3 SO 3 also showed good catalytic performance.The esterification of carboxylic acids and alcohols is acidcatalyzed and equilibrium limited reaction to produce the commercial esters. [1] Esters are widely utilized as fragrances in essential oils, [2] and raw materials for lubricants, plasticizers and paints, [3] In order to improve the greenness and efficiency of current esterification technologies, engineers and researchers are mainly focused on the following aspects. One is to design novel reactors, such as pervaporation reactors and reactive distilled reactors, which will shift the reaction equilibrium toward ester production side by accelerating the removal of side products. [4] Another is to develop green and effective acidic catalysts. To date, many solid acid catalysts have been developed to replace the conventional homogenous catalysts to avoid corrosion and separation issues, [5] such as zeolites, [6] metal oxides, [7] heteropolyacids, [8] and Amberlyst. [9] Recently, we have developed three acidic ionic liquids based Zr-MOF (UiO-67-HSO 4 , UiO-67-CF 3 SO 3 and UiO-67-hifpOSO 3 ) which can be utilized as efficient catalysts in esterification. [10] They all showed good catalytic activities in the esterification of acetic acid and isooctyl alcohol, of which UiO-67-CF 3 SO 3 performed best. However, UiO-67-CF 3 SO 3 degraded gradually mainly due to the formation of water in the reaction process and the long reaction time.The surface wettability of solid catalysts is closely related to their catalytic performance. [11] For the reactions involved with olephilic reactants or hydrophilic products, the hydrophobization of the surface of solid catalysts is an effective way to enhance the catalytic performance due to the high enrichment of reactants and the fast discharge of products. In various hydrophobic modification methods, PDMS coating is emerging as a promising way to enhance the hydrophobicity and moisture/water-resistant of the materials. For example, Huang et al. reported the modification of surface hydrophobicity of Pd/UiO-66 via a simple PDMS coating...

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“…However, the condensing temperature and the discharge temperature might be different in ATES systems, especially for seasonal storage applications. If these temperatures are assumed to be the same, the minimum discharge temperature for a particular pair of intermediate and low temperatures can be calculated using the following relationship [27]- [31].…”

Section: State-of-the-art Sorption-based Energy Storage Systemsmentioning

confidence: 99%

“…This equation is derived from the Dubinin-Astakhov isotherm equation by equating the uptake values using the relative pressures for the charging and discharging processes. Aristov stated that this equation can predict the minimum charging temperature with an accuracy of ±1°C, while Muttakin et al highlighted that the equation is applicable to all IUPAC isotherms with reasonable accuracy [18], [32]. Figure 4 shows the available discharge temperatures from an ATES system at various minimum charged temperatures for several evaporation temperatures.…”

Section: State-of-the-art Sorption-based Energy Storage Systemsmentioning

confidence: 99%

Sorption-based Energy Storage Systems: A Review

Thu¹,

Nasruddin²,

Mitra³

et al. 2019

MST

Self Cite

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Mismatched timing between the supply and demand of energy calls for reliable storage systems. Energy storage systems have become further significant with the widespread implementation of renewable energy. These systems can mitigate problems that are often associated with renewable energy sources such as supply unreliability while meeting the demand during peak hours. Energy can be stored in various forms, yet storage systems can be generally grouped based on their output forms, namely (i) electricity and (ii) heat or thermal energy. Electrical energy is the most convenient and effective form since it can power almost all modern devices. However, the electricity itself is vastly produced by thermodynamic cycles at a particular thermal efficiency using thermal energy from fossil fuels. Meanwhile, thermal energy for the HVAC&R and the production of hot water remains the largest portion of the building energy sector. Thermal energy can be stored in the form of sensible, latent, and thermochemical energy. This review focuses on thermochemical sorption-based energy storage systems. These systems exploit endothermic and exothermic sorption processes for charging and discharging of the thermal energy. Sorption-based storage systems exhibit huge potential due to a high energy density and their ability to store the energy at room temperature. We discuss the current state-of-the-art developments, key challenges, and future prospects of sorption-based energy systems.

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Theoretical framework to evaluate minimum desorption temperature for IUPAC classified adsorption isotherms

Cited by 283 publications

References 50 publications

Water Vapor Adsorption by Some Manganese Oxide Forms

Water Vapor Adsorption by Some Manganese Oxide Forms

Fast Catalytic Esterification Using a Hydrophobized Zr‐MOF with Acidic Ionic Liquid Linkers

Sorption-based Energy Storage Systems: A Review

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