Water sorption properties of functionalized MIL-101(Cr)-X (X=-NH2, –SO3H, H, –CH3, –F) based composites as thermochemical heat storage materials

Shi, Weina; Zhu, Yanqing; Shen, Cong; Shi, Jifu; Xu, Gang; Xiao, Xiudi; Cao, Renyi

doi:10.1016/j.micromeso.2019.05.003

Cited by 49 publications

(30 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It appears clear that various materials attain their optimal performance under particular operating conditions, but none of them really stands out significantly above the others. In consequence, the current trend is either to still search for completely new adsorbents (e.g., [11][12][13][14][15]) or to find optimal operating conditions for the existing materials.…”

Section: Introductionmentioning

confidence: 99%

Heat Release Kinetics upon Water Vapor Sorption Using Cation-Exchanged Zeolites and Prussian Blue Analogues as Adsorbents: Application to Short-Term Low-Temperature Thermochemical Storage of Energy

et al. 2021

View full text Add to dashboard Cite

In view of potential uses in short-term thermochemical heat storage by sorption of water vapor, the capacity to release a sufficient heat amount at the appropriate rate of a Prussian blue analogue (PBA) containing hexacyanocobaltate vacancies has been compared with those of 13X type zeolites possessing Na+, Ce3+, Ce4+, or Tb3+ extra-framework compensating cations. The extended structural and surface characterization demonstrated good reproducibility of the preparation procedures performed on a 10-g scale. The adsorbents were tested under dynamic conditions of gas flow with the aid of either a gas flow calorimeter (120 mL h−1 helium flow) to measure the amount and rate of the integral heat release or a laboratory-scale test rig (15,000 to 22,800 mL h−1 nitrogen flow) to monitor the outlet temperature of nitrogen heated by adsorption. For a regeneration temperature of 353 K and a partial H2O pressure of 2.8 kPa in helium, the PBA sample yielded an integral heat ranging between 900 and 1020 kJ kg−1 with a very slow heat release lasting for even 12–14 h. The zeolite-based materials generated between 350 and 950 kJ kg−1 more rapidly (up to 6–7 h), depending on the nature and the content of compensating cations, as well as on the dehydration state achieved during regeneration. With the laboratory-scale test rig, the efficiency of heat extraction by convection was about 65% for Na-13X and only 38% for PBA, and it diminished with decreasing flow rate.

show abstract

Section: Introductionmentioning

confidence: 99%

Heat Release Kinetics upon Water Vapor Sorption Using Cation-Exchanged Zeolites and Prussian Blue Analogues as Adsorbents: Application to Short-Term Low-Temperature Thermochemical Storage of Energy

et al. 2021

View full text Add to dashboard Cite

show abstract

“…According to Fig. 4, the maximum amount adsorbed at saturation varies between 100 and 150 mg g -1 and it is obviously lower than the experimentally measured capacities of adsorption reported for zeolites or zeolite-like materials tested under harsher degassing conditions; e.g., 230 mg g -1 for synthetic nano-sized zeolites as a function of NaCl concentration after a thermal treatment at 200 °C [37], 400-600 mg g -1 at a p/p0 of 32% for mesoporous modified MIL-101 materials in presence of CaCl2 after a complete removal of water [8], as well as 240-600 mg g -1 in the case a series of different MOF structures after a desorption under vacuum [38]. Nevertheless, when the activation conditions are kept mild, the sorption performance of the present ionosilicas becomes comparable to those of 13X, LTA, mordenite or AlPO/SAPO frameworks [35,39,40].…”

Section: Adsorption Properties Of Ionosilica Samples Towards Water Vamentioning

confidence: 61%

“…Water vapor is by far the most frequently considered adsorbate in this respect and the principal criteria for adsorbent selection usually include high heats of water adsorption and improved hydrothermal stability. Besides classical hydrophilic and crystalline or amorphous adsorbents proposed in the past [3], a more recent tendency is to elaborate materials capable of adsorbing much water vapor at relatively low pressures and of being regenerated under mild temperature conditions [4][5][6][7][8]. With the open sorption systems operating in the moist-air flow mode, the presence of various air pollutants entering into competition with water vapor and thus diminishing the energy storage density is another important parameter that needs to be considered thoroughly [9].…”

Section: Introductionmentioning

confidence: 99%

Ionosilica-based anion exchangers for low-temperature thermochemical storage of energy under mild conditions of adsorbent regeneration and saturation

Wu¹,

Hesemann²,

Trens³

et al. 2020

Chemical Engineering Journal

View full text Add to dashboard Cite

Three ionosilica materials have been tested for low-temperature thermochemical storage of energy under mild conditions of adsorbent regeneration and saturation. The previous synthesis procedures were adapted to prepare materials possessing an organosilica framework with silylated cationic blocs and Cl-, HSO4-, SO4 2anions in various proportions as extra-framework compensating counter-ions. Transmission and Scanning Electron Microscopy, Wavelength Dispersive X-Ray Fluorescence, Energy Dispersive X-ray Spectroscopy, Thermogravimetric analysis, adsorption of gaseous nitrogen at 77 K, 29 Si Solid-State Nuclear Magnetic Resonance spectroscopy were employed to establish the key characteristics of the three ionosilica samples in terms of elemental composition, particle morphology and textural properties, thermal stability and regenerability, or variability of surface activity during repeated hydrationdehydration cycles. Their capacity to adsorb water vapor at cool and moderate ambient temperatures after incomplete surface drying was demonstrated by means of the scanning microscopy operating in low-vacuum mode at 275 K, or more precisely by measuring the water adsorption isotherms at 313 K and the related differential heats under static conditions. Finally, flow calorimetry operating in the moist-gas flow mode was used to measure the integral heat accompanying the adsorption of water vapor at its partial pressure of 2.8 kPa and 296 K as well as the kinetics of heat release in three drying-saturation cycles. After a drying procedure carried out under helium flow at 353 K, the thermal performance of two ionosilica samples containing both HSO4and SO4 2counter-ions was sufficient enough to consider them as potential adsorbents for auxiliary space heating in homes, small businesses, or public buildings.

show abstract

“…For the impedance measurements presented in Figure 2, the response was modeled as composed by a pure resistive component associated with the electronic conduction, and a resistive/capacitive response attributed to charge accumulation in the polymer chains interfaces. [79] The porous and hydrophilic features of the MOF-NH 2 could lead to an increased contact area between the conductive PEDOT and the ionic solutions. For this system, the observed increase on the resistive component can be attributed to the presence of MOF which agrees with 4PP resistance measurements carried on air.…”

Section: Impedance Spectroscopy As a Tool To Elucidate Conduction Mecmentioning

confidence: 99%

“…The above discussed enhancement of impedance response after incorporation of MOF-NH 2 can be understood in terms of the expected increased hydrophilic character of the composite. [79] The porous and hydrophilic features of the MOF-NH 2 could lead to an increased contact area between the conductive PEDOT and the ionic solutions.…”

Section: Impedance Spectroscopy As a Tool To Elucidate Conduction Mecmentioning

confidence: 99%

MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors

et al. 2020

View full text Add to dashboard Cite

Due to its deleterious effects on health, development of new methods for detection and removal of pesticide residues in primary and derived agricultural products is a research topic of great importance. Among them, imazalil (IMZ) is a widely used post‐harvest fungicide with good performances in general, and is particularly applied to prevent green mold in citrus fruits. In this work, a composite film for the impedimetric sensing of IMZ built from metal‐organic framework nanocrystallites homogeneously distributed on a conductive poly(3,4‐ethylene dioxythiophene) (PEDOT) layer is presented. The as‐synthetized thin films are produced via spin‐coating over poly(ethylene terephtalate (PET) substrate following a straightforward, cost‐effective, single‐step procedure. By means of impedance spectroscopy, electric transport properties of the films are studied, and high sensitivity towards IMZ concentration in the range of 15 ppb to 1 ppm is demonstrated (featuring 1.6 and 4.2 ppb limit of detection, when using signal modulus and phase, respectively). The sensing platform hereby presented could be used for the construction of portable, miniaturized, and ultrasensitive devices, suitable for pesticide detection in food, wastewater effluents, or the assessment of drinking‐water quality.

show abstract

Water sorption properties of functionalized MIL-101(Cr)-X (X=-NH2, –SO3H, H, –CH3, –F) based composites as thermochemical heat storage materials

Cited by 49 publications

References 51 publications

Heat Release Kinetics upon Water Vapor Sorption Using Cation-Exchanged Zeolites and Prussian Blue Analogues as Adsorbents: Application to Short-Term Low-Temperature Thermochemical Storage of Energy

Heat Release Kinetics upon Water Vapor Sorption Using Cation-Exchanged Zeolites and Prussian Blue Analogues as Adsorbents: Application to Short-Term Low-Temperature Thermochemical Storage of Energy

Ionosilica-based anion exchangers for low-temperature thermochemical storage of energy under mild conditions of adsorbent regeneration and saturation

MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors

Contact Info

Product

Resources

About