A general method for measuring the thermal conductivity of MOF crystals

Huang, Jun; Xia, Xiaoxiao; Hu, Xuejiao; Li, Song; Liu, Kang

doi:10.1016/j.ijheatmasstransfer.2019.04.018

Cited by 52 publications

(38 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… 99 , 231 In packed beds, this transport mainly occurs through the porous particle contact points, lowering at least 1 order of magnitude the pristine (crystal) MOF values. 396 , 397 The use of binders and coatings is used to alleviate this drawback. 280 , 336 Because not only conduction plays a role but also the heat capacity of the materials, a better parameter to characterize the thermal transport is the thermal diffusivity a = λ/(ρ· c p ) [m 2 s –1 ] that describes how fast temperature profiles move in the system (see Figure 2 ).…”

Section: Evaluation and Outlookmentioning

confidence: 99%

Water and Metal–Organic Frameworks: From Interaction toward Utilization

2020

View full text Add to dashboard Cite

The steep stepwise uptake of water vapor and easy release at low relative pressures and moderate temperatures together with high working capacities make metal–organic frameworks (MOFs) attractive, promising materials for energy efficient applications in adsorption devices for humidity control (evaporation and condensation processes) and heat reallocation (heating and cooling) by utilizing water as benign sorptive and low-grade renewable or waste heat. Emerging MOF-based process applications covered are desiccation, heat pumps/chillers, water harvesting, air conditioning, and desalination. Governing parameters of the intrinsic sorption properties and stability under humid conditions and cyclic operation are identified. Transport of mass and heat in MOF structures, at least as important, is still an underexposed topic. Essential engineering elements of operation and implementation are presented. An update on stability of MOFs in water vapor and liquid systems is provided, and a suite of 18 MOFs are identified for selective use in heat pumps and chillers, while several can be used for air conditioning, water harvesting, and desalination. Most applications with MOFs are still in an exploratory state. An outlook is given for further R&D to realize these applications, providing essential kinetic parameters, performing smart engineering in the design of systems, and conceptual process designs to benchmark them against existing technologies. A concerted effort bridging chemistry, materials science, and engineering is required.

show abstract

Section: Evaluation and Outlookmentioning

confidence: 99%

Water and Metal–Organic Frameworks: From Interaction toward Utilization

2020

View full text Add to dashboard Cite

show abstract

“…11 Experimental measurements of k in MOFs are challenging due to the difficulty in growing high-quality single crystals to large-enough size in millimeters. 12 Existing measurements report k of 0.32, 0.33, and 0.11 W m À1 K À1 for MOF-5, 13 ZIF-8, 14 and UiO-66, 15 respectively. Such ultralow k in MOFs, according to force-eld-based molecular dynamics (MD) simulations, has been attributed to the short phonon mean free path, 16 the mass mismatch between metal and oxygen atoms, 17 and the interface thermal resistance between metal nodes and organic linkers.…”

Section: Introductionmentioning

confidence: 99%

Insights into the thermal conductivity of MOF-5 from first principles

Zhang

Liu

2021

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…The MIL-53 family (M = Al, Fe, Ga, In) of benzene-1,4-dicarboxylates are MOFs with breathing properties which can be easily synthesized and have high stability [77][78][79]. These breathing properties are based on a phase transition that can be used in thermal management.…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…When adsorbing methane, MIL-53(Al) exhibits breathing properties at low temperatures and pressure due to the low stability of the (np) phase. At room temperature, the breathing properties are due to hydrogen bonding that leads to the greater stability of a very narrow pore phase (vnp) and the (np) phase of framework [77,78]. The adsorption of MIL-53(Al)-NH 2 for methane is performed under a certain pressure and temperature, which leads to liquefaction.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Implementing Metal-Organic Frameworks for Natural Gas Storage

et al. 2019

View full text Add to dashboard Cite

Methane can be stored by metal-organic frameworks (MOFs). However, there remain challenges in the implementation of MOFs for adsorbed natural gas (ANG) systems. These challenges include thermal management, storage capacity losses due to MOF packing and densification, and natural gas impurities. In this review, we discuss discoveries about how MOFs can be designed to address these three challenges. For example, Fe(bdp) (bdp 2− = 1,4-benzenedipyrazolate) was discovered to have intrinsic thermal management and released 41% less heat than HKUST-1 (HKUST = Hong Kong University of Science and Technology) during adsorption. Monolithic HKUST-1 was discovered to have a working capacity 259 cm 3 (STP) cm −3 (STP = standard temperature and pressure equivalent volume of methane per volume of the adsorbent material: T = 273.15 K, P = 101.325 kPa), which is a 50% improvement over any other previously reported experimental value and virtually matches the 2012 Department of Energy (Department of Energy = DOE) target of 263 cm 3 (STP) cm −3 after successful packing and densification. In the case of natural gas impurities, higher hydrocarbons and other molecules may poison or block active sites in MOFs, resulting in up to a 50% reduction of the deliverable energy. This reduction can be mitigated by pore engineering. of 9.2 MJ L −1 , which is 70% less than that of gasoline [2,15]. However, carrying an extremely pressurized tank raises safety concerns in vehicles in the case of accidents and has an energy cost associated with compression. Furthermore, CNG, which is the established and predominant technology for NGVs, has a driving range of 350-450 km as compared to 400-600 km for gasoline-powered vehicles [16]. Based on this, there is a need to develop gas storage technology beyond that which is already established in real life applications. Further improvements in natural gas storage for NGV technology should seek to improve driving range to decrease time at the pump and the corresponding number of required tank recharges. Increasing driving range would be helpful to implement the technology in areas where natural gas filling stations are not as abundant. In addition, the CNG tank that holds the fuel takes up cargo space and technological advancements that decrease the volume of the natural gas fuel tank are beneficial. Another approach to store natural gas is LNG, which has an energy density of 22.2 MJ L −1 . Some drawbacks of LNG are the energy and cost associated with liquefaction (−162 • C), which present major technological obstacles [17,18] Lastly natural gas can be stored as ANG. Fairly large volumetric capacities of 4-6 MJ L −1 at pressures of around 35 bar at room temperature for different adsorbents were achieved [19]. The presence of sorbent materials in high pressure tanks reduces the pressure requirement of the tanks, making storage and delivery safer and allows for the use of single-stage compressors. ANG may increase the driving range and decrease the volume required of the fuel tank to achieve a specific driving dis...

show abstract

A general method for measuring the thermal conductivity of MOF crystals

Cited by 52 publications

References 35 publications

Water and Metal–Organic Frameworks: From Interaction toward Utilization

Water and Metal–Organic Frameworks: From Interaction toward Utilization

Insights into the thermal conductivity of MOF-5 from first principles

Implementing Metal-Organic Frameworks for Natural Gas Storage

Contact Info

Product

Resources

About