scholarly journals A single-ligand ultra-microporous MOF for precombustion CO2capture and hydrogen purification

2015 ◽  
Vol 1 (11) ◽  
pp. e1500421 ◽  
Author(s):  
Shyamapada Nandi ◽  
Phil De Luna ◽  
Thomas D. Daff ◽  
Jens Rother ◽  
Ming Liu ◽  
...  
Keyword(s):  
Binding Sites ◽  
Metal Organic Frameworks ◽  
Binding Energies ◽  
Hydrogen Purification ◽  
Zeolite 13X ◽  
Gas Streams ◽  
Surface Areas ◽  
Metal Organic ◽  
Pressure Swing ◽  
Adsorption Desorption

Metal organic frameworks (MOFs) built from a single small ligand typically have high stability, are rigid, and have syntheses that are often simple and easily scalable. However, they are normally ultra-microporous and do not have large surface areas amenable to gas separation applications. We report an ultra-microporous (3.5 and 4.8 Å pores) Ni-(4-pyridylcarboxylate)2with a cubic framework that exhibits exceptionally high CO2/H2selectivities (285 for 20:80 and 230 for 40:60 mixtures at 10 bar, 40°C) and working capacities (3.95 mmol/g), making it suitable for hydrogen purification under typical precombustion CO2capture conditions (1- to 10-bar pressure swing). It exhibits facile CO2adsorption-desorption cycling and has CO2self-diffusivities of ~3 × 10−9m2/s, which is two orders higher than that of zeolite 13X and comparable to other top-performing MOFs for this application. Simulations reveal a high density of binding sites that allow for favorable CO2-CO2interactions and large cooperative binding energies. Ultra-micropores generated by a small ligand ensures hydrolytic, hydrostatic stabilities, shelf life, and stability toward humid gas streams.

scholarly journals Metal organic frameworks for hydrogen purification

2021 ◽  
Author(s):  
Donglai Mao ◽  
John M. Griffin ◽  
Richard Dawson ◽  
Alasdair Fairhurst ◽  
Nuno Bimbo
Keyword(s):  
Metal Organic Frameworks ◽  
Hydrogen Purification ◽  
Metal Organic

scholarly journals Experimental investigations on the irregular synthesis of the iron(III) terephthalate metal-organic frameworks MOF-235 and MIL-101

2021 ◽  
Author(s):  
Isabelle Simonsson ◽  
Philip Gärdhagen ◽  
Moira Andrén ◽  
Pui Lam Tam ◽  
Zareen Abbas
Keyword(s):  
Crystal Structures ◽  
Metal Organic Frameworks ◽  
Experimental Investigations ◽  
Surface Areas ◽  
Metal Organic

(Fe)-MOF-235 and (Fe)-MIL-101 are two well-studied iron(III) terephthalate metal-organic frameworks (MOFs) with dissimilar crystal structures and topologies. Previously reported syntheses of the former show greatly varying surface areas, indicating a...

scholarly journals Benchmark Study of Hydrogen Storage in Metal–Organic Frameworks under Temperature and Pressure Swing Conditions

2018 ◽  
Vol 3 (3) ◽  
pp. 748-754 ◽  
Author(s):  
Paula García-Holley ◽  
Benjamin Schweitzer ◽  
Timur Islamoglu ◽  
Yangyang Liu ◽  
Lu Lin ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Metal Organic Frameworks ◽  
Benchmark Study ◽  
Metal Organic ◽  
Temperature And Pressure ◽  
Pressure Swing

scholarly journals Temperature dependence of adsorption hysteresis in flexible metal organic frameworks

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Shamsur Rahman ◽  
Arash Arami-Niya ◽  
Xiaoxian Yang ◽  
Gongkui Xiao ◽  
Gang (Kevin) Li ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Capillary Condensation ◽  
Metal Organic Frameworks ◽  
Sorption Isotherms ◽  
Separation Performance ◽  
Process Simulations ◽  
Metal Organic ◽  
Flexible Metal ◽  
Pressure Swing ◽  
External Stimuli

Abstract“Breathing” and “gating” are striking phenomena exhibited by flexible metal-organic frameworks (MOFs) in which their pore structures transform upon external stimuli. These effects are often associated with eminent steps and hysteresis in sorption isotherms. Despite significant mechanistic studies, the accurate description of stepped isotherms and hysteresis remains a barrier to the promised applications of flexible MOFs in molecular sieving, storage and sensing. Here, we investigate the temperature dependence of structural transformations in three flexible MOFs and present a new isotherm model to consistently analyse the transition pressures and step widths. The transition pressure reduces exponentially with decreasing temperature as does the degree of hysteresis (c.f. capillary condensation). The MOF structural transition enthalpies range from +6 to +31 kJ·mol−1 revealing that the adsorption-triggered transition is entropically driven. Pressure swing adsorption process simulations based on flexible MOFs that utilise the model reveal how isotherm hysteresis can affect separation performance.

Reticular Chemistry and Metal-Organic Frameworks for Clean Energy

MRS Bulletin ◽  
2009 ◽  
Vol 34 (9) ◽  
pp. 682-690 ◽  
Author(s):  
Omar M. Yaghi ◽  
Qiaowei Li
Keyword(s):  
Carbon Dioxide ◽  
Metal Organic Frameworks ◽  
Clean Energy ◽  
Building Blocks ◽  
Zeolitic Imidazolate Frameworks ◽  
Design Concepts ◽  
Surface Areas ◽  
Molecular Building Blocks ◽  
Metal Organic ◽  
Molecular Aspects

AbstractReticular chemistry concerns the linking of molecular building blocks into predetermined structures using strong bonds. We have been working on creating and developing the conceptual and practical basis of this new area of research. As a result, new classes of crystalline porous materials have been designed and synthesized: metal-organic frameworks, zeolitic imidazolate frameworks, and covalent organic frameworks. Crystals of this type have exceptional surface areas (2,000−6,000 m2/g) and take up voluminous amounts of hydrogen (7.5 wt% at 77 K and 3−4 × 106 Pa), methane (50 wt% at 298 K and 2.5 × 106 Pa), and carbon dioxide (140 wt% at 298 K and 3 × 106 Pa). We have driven the basic science all the way to applications without losing sight of our quest for understanding the underlying molecular aspects of this chemistry. The presentation was focused on the design concepts, synthesis, and structure of these materials, with emphasis on their applications to onboard energy storage.

scholarly journals Microbial reduction of metal-organic frameworks enables synergistic chromium removal

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Sarah K. Springthorpe ◽  
Christopher M. Dundas ◽  
Benjamin K. Keitz
Keyword(s):  
Metal Oxides ◽  
Metal Organic Frameworks ◽  
Shewanella Oneidensis ◽  
Microbial Reduction ◽  
Pollutant Removal ◽  
Inorganic Materials ◽  
Surface Areas ◽  
Synthetic Materials ◽  
Metal Organic ◽  
Multiple Cycles

AbstractRedox interactions between electroactive bacteria and inorganic materials underpin many emerging technologies, but commonly used materials (e.g., metal oxides) suffer from limited tunability and can be challenging to characterize. In contrast, metal-organic frameworks exhibit well-defined structures, large surface areas, and extensive chemical tunability, but their utility as microbial substrates has not been examined. Here, we report that metal-organic frameworks can support the growth of the metal-respiring bacterium Shewanella oneidensis, specifically through the reduction of Fe(III). In a practical application, we show that cultures containing S. oneidensis and reduced metal-organic frameworks can remediate lethal concentrations of Cr(VI) over multiple cycles, and that pollutant removal exceeds the performance of either component in isolation or bio-reduced iron oxides. Our results demonstrate that frameworks can serve as growth substrates and suggest that they may offer an alternative to metal oxides in applications seeking to combine the advantages of bacterial metabolism and synthetic materials.

scholarly journals Recent Trends in Covalent and Metal Organic Frameworks for Biomedical Applications

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 916 ◽  
Author(s):  
Georges Chedid ◽  
Ali Yassin
Keyword(s):  
Drug Delivery ◽  
Biomedical Applications ◽  
Materials Science ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
Great Promise ◽  
Surface Areas ◽  
Metal Organic ◽  
New Type ◽  
Recent Trends

Materials science has seen a great deal of advancement and development. The discovery of new types of materials sparked the study of their properties followed by applications ranging from separation, catalysis, optoelectronics, sensing, drug delivery and biomedicine, and many other uses in different fields of science. Metal organic frameworks (MOFs) and covalent organic frameworks (COFs) are a relatively new type of materials with high surface areas and permanent porosity that show great promise for such applications. The current study aims at presenting the recent work achieved in COFs and MOFs for biomedical applications, and to examine some challenges and future directions which the field may take. The paper herein surveys their synthesis, and their use as Drug Delivery Systems (DDS), in non-drug delivery therapeutics and for biosensing and diagnostics.

Theoretical Insights into the Tuning of Metal Binding Sites of Paddlewheels inrht-Metal-Organic Frameworks

ChemPhysChem ◽  
2015 ◽  
Vol 16 (15) ◽  
pp. 3170-3179 ◽  
Author(s):  
Tony Pham ◽  
Katherine A. Forrest ◽  
Wen-Yang Gao ◽  
Shengqian Ma ◽  
Brian Space
Keyword(s):  
Metal Binding ◽  
Binding Sites ◽  
Metal Organic Frameworks ◽  
Metal Binding Sites ◽  
Metal Organic

scholarly journals Crystallography of metal–organic frameworks

IUCrJ ◽  
2014 ◽  
Vol 1 (6) ◽  
pp. 563-570 ◽  
Author(s):  
Felipe Gándara ◽  
Thomas D. Bennett
Keyword(s):  
High Pressures ◽  
Metal Organic Frameworks ◽  
Chemical Diversity ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Complex Behaviour ◽  
Surface Areas ◽  
Rate Limiting Step ◽  
Structure Solution ◽  
Metal Organic

Metal–organic frameworks (MOFs) are one of the most intensely studied material types in recent times. Their networks, resulting from the formation of strong bonds between inorganic and organic building units, offer unparalled chemical diversity and pore environments of growing complexity. Therefore, advances in single-crystal X-ray diffraction equipment and techniques are required to characterize materials with increasingly larger surface areas, and more complex linkers. In addition, whilst structure solution from powder diffraction data is possible, the area is much less populated and we detail the current efforts going on here. We also review the growing number of reports on diffraction under non-ambient conditions, including the response of MOF structures to very high pressures. Such experiments are important due to the expected presence of stresses in proposed applications of MOFs – evidence suggesting rich and complex behaviour. Given the entwined and inseparable nature of their structure, properties and applications, it is essential that the field of structural elucidation is able to continue growing and advancing, so as not to provide a rate-limiting step on characterization of their properties and incorporation into devices and applications. This review has been prepared with this in mind.

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