Helium and Hydrogen Isotope Adsorption and Separation in Metal-Organic Frameworks

Download Helium and Hydrogen Isotope Adsorption and Separation in Metal-Organic Frameworks PDF Online Free

Author :
Publisher : Cuvillier Verlag
ISBN 13 : 3736983778
Total Pages : 200 pages
Book Rating : 4.7/5 (369 download)

DOWNLOAD NOW!


Book Synopsis Helium and Hydrogen Isotope Adsorption and Separation in Metal-Organic Frameworks by : Ingrid Zaiser

Download or read book Helium and Hydrogen Isotope Adsorption and Separation in Metal-Organic Frameworks written by Ingrid Zaiser and published by Cuvillier Verlag. This book was released on 2016-10-31 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The separation of isotopes has always been a challenge because of their identical size, shape and thermodynamic properties. Nowadays, the extraction of deuterium is performed e.g. by the Girdler Sulfid process or cryogenic distillation, which lead to low separation factors (below 2.5) in combination with high energy costs. The standard way to produce helium-3 is to skim it as a byproduct of the radioactive tritium decay. In this thesis, two alternative approaches have been investigated for the separation of light isotopes, Quantum Sieving and Chemical Affinity Sieving . While Quantum Sieving is based on confinement in small pores, Chemical Affinity Sieving relies on strong adsorption sites. Both methods use the mass difference of the isotopes, which is related to their zero-point energy. The microporous metal-organic frameworks are excellent candidates for studying these quantum effects due to their well-defined pore structure and the possibility to introduce strong adsorption sites directly into the framework. The samples have been exposed to an isotope mixture and the adsorbed quantity of each isotope was detected by low-temperature thermal desorption spectroscopy (TDS). The ratio of the desorbed amount of the isotopes leads directly to the selectivity (separation factor). The selectivity is determined as a function of exposure time and temperature and exhibits the highest value of 25 observed for hydrogen isotopes at temperatures well above the boiling point of liquid nitrogen.

Hydrogen Isotope Separation in Metal-Organic Frameworks

Download Hydrogen Isotope Separation in Metal-Organic Frameworks PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (114 download)

DOWNLOAD NOW!


Book Synopsis Hydrogen Isotope Separation in Metal-Organic Frameworks by : Naiyuan Zhang

Download or read book Hydrogen Isotope Separation in Metal-Organic Frameworks written by Naiyuan Zhang and published by . This book was released on 2018 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we present our research on hydrogen isotope separation using metal-organic frameworks (MOFs). Deuterium is one of the two stable isotopes of hydrogen. Despite its wide range of application, currently there is no ideal industrial method that can separate deuterium in a fast and efficient fashion. MOFs are a class of porous materials consisting of metal ions or clusters connected by organic ligands. They have shown great potential in separating hydrogen isotopes via quantum sieving effect. In this thesis, we first provide background on two state-of-art MOFs, Co-MOF-74 and Cu(I)-MFU-4l. Then we elaborate on the statistical theory of selectivity, the mechanism of separation and the basic idea of mass spectrometry, which is the main analytical technique used in this project. We present temperature programmed desorption (TPD) spectra for both samples. Direct separation measurement is made with Co-MOF-74. We confirm that TPD spectra can predict the results of direct separation measurements. The TPD spectra of Cu(I)-MFU-4l predict a selectivity of approximately 6 at easily accessible temperatures (~260K). This shows the practicality of using Cu(I)-MFU-4l for hydrogen isotope separation. Preferential adsorption separation is also performed with Co-MOF-74. The extracted activation energy agrees to within 10% of literature predictions based on quantum zero point energy models.

A Gas Flow-Through System for Hydrogen Isotopic Separation with Metal-Organic Frameworks

Download A Gas Flow-Through System for Hydrogen Isotopic Separation with Metal-Organic Frameworks PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 47 pages
Book Rating : 4.:/5 (114 download)

DOWNLOAD NOW!


Book Synopsis A Gas Flow-Through System for Hydrogen Isotopic Separation with Metal-Organic Frameworks by : Katharine Harp Rigdon

Download or read book A Gas Flow-Through System for Hydrogen Isotopic Separation with Metal-Organic Frameworks written by Katharine Harp Rigdon and published by . This book was released on 2019 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we designed and built a gas flow-through system to study dynamic adsorption separation of hydrogen isotopes in metal-organic frameworks (MOFs). MOFs are porous, crystalline materials composed of metal complexes connected by organic linkers. They have been proposed as a cheaper, more energy efficient approach to hydrogen isotope separation than current industrial methods. We have previously found evidence of a zero-point energy-based separation mechanism for hydrogen isotopes in two MOFs: Co-MOF-74 and Cu(I)-MFU-4l. This mechanism, chemical affinity quantum sieving (CAQS), has been extensively studied under static equilibrium conditions. The system in this work was developed so that CAQS could be studied under dynamic conditions that more closely resemble those in industrial separation. Breakthrough analysis is an established technique for studying dynamic separation in porous materials. Generally, a breakthrough experiment involves flowing a gas mixture through a fixed bed of adsorbent material and measuring the composition of the effluent flow. In this work, a 1:1 mixture of common hydrogen and its isotope deuterium was flowed through 71 mg of Co-MOF-74 or 22 mg of Cu(I)-MFU-4l. A quadrupole mass spectrometer was used to monitor the composition of the effluent flow. We saw preferential adsorption of deuterium over common hydrogen in Co-MOF-74 at 77K and Cu(I)-MFU-4l at 170K, 140K, and 110K. This behavior was absent in Cu(I)-MFU-4l at 77K, a phenomenon that we would like to investigate further. Minimal adsorption occurred in both MOFs at room temperature, as expected. A selectivity of deuterium over common hydrogen was calculated for each temperature. These selectivities were approximately 30% lower than comparable literature values. Our goal is to make improvements to our system and methods to measure the selectivity more accurately and reproducibly. Notably, all measured selectivities were higher than the selectivity of the Girdler Sulfide method and cryogenic distillation, two industrial hydrogen isotope separation processes we are trying to improve on. This new system gives us the capability to study dynamic adsorption and kinetic separation of hydrogen isotopes in metal-organic frameworks going forward. We hope that our work will inform the development of efficient, environmentally sustainable separation processes.

Overtone Spectroscopy of Hydrogen in MOF-5

Download Overtone Spectroscopy of Hydrogen in MOF-5 PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (115 download)

DOWNLOAD NOW!


Book Synopsis Overtone Spectroscopy of Hydrogen in MOF-5 by : Jocienne N. Nelson

Download or read book Overtone Spectroscopy of Hydrogen in MOF-5 written by Jocienne N. Nelson and published by . This book was released on 2014 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-Organic Frameworks, or MOFs, are an exciting class of nanoporous crystalline materials with applications that include hydrogen storage and hydrogen isotope separation. The dynamics of adsorbed molecular hydrogen in the prototypical material known as MOF-5 have previously been studied using infrared spectroscopy. However, the rovibrational spectrum of the isotopologues, HD and D2 were obscured due to overlap with the MOF peaks. Overtone infrared spectroscopy in conjunction with a diffuse reflectance geometry is used to observe the spectrum of H2, HD and D2. The overtone spectrum is shown to facilitate the identification of hydrogen peaks. Further, the spectrum of trapped H2 near the crystallographic metal site is greatly enhanced relative to other sites and displays a greater intensity relative to the fundamental spectrum than is seen in gas phase hydrogen. The ability of the MOF to catalyze ortho to para conversion of trapped species is also discussed.

Gas Adsorption in Metal-Organic Frameworks

Download Gas Adsorption in Metal-Organic Frameworks PDF Online Free

Author :
Publisher : CRC Press
ISBN 13 : 0429891776
Total Pages : 530 pages
Book Rating : 4.4/5 (298 download)

DOWNLOAD NOW!


Book Synopsis Gas Adsorption in Metal-Organic Frameworks by : T. Grant Glover

Download or read book Gas Adsorption in Metal-Organic Frameworks written by T. Grant Glover and published by CRC Press. This book was released on 2018-09-03 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text discusses the synthesis, characterization, and application of metal-organic frameworks (MOFs) for the purpose of adsorbing gases. It provides details on the fundamentals of thermodynamics, mass transfer, and diffusion that are commonly required when evaluating MOF materials for gas separation and storage applications and includes a discussion of molecular simulation tools needed to examine gas adsorption in MOFs. Additionally, the work presents techniques that can be used to characterize MOFs after gas adsorption has occurred and provides guidance on the water stability of these materials. Lastly, applications of MOFs are considered with a discussion of how to measure the gas storage capacity of MOFs, a discussion of how to screen MOFs to for filtration applications, and a discussion of the use of MOFs to perform industrial separations, such as olefin/paraffin separations. Throughout the work, fundamental information, such as a discussion on the calculation of MOF surface area and description of adsorption phenomena in packed-beds, is balanced with a discussion of the results from research literature.

Experimental Investigation of H2/D2 Isotope Separation by Cryoadsorption in Metal-organic Frameworks

Download Experimental Investigation of H2/D2 Isotope Separation by Cryoadsorption in Metal-organic Frameworks PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (864 download)

DOWNLOAD NOW!


Book Synopsis Experimental Investigation of H2/D2 Isotope Separation by Cryoadsorption in Metal-organic Frameworks by : Julia Sonja Teufel

Download or read book Experimental Investigation of H2/D2 Isotope Separation by Cryoadsorption in Metal-organic Frameworks written by Julia Sonja Teufel and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Capture of Heavy Hydrogen Isotopes in a Metal-organic Framework with Active Cu(I) Sites

Download Capture of Heavy Hydrogen Isotopes in a Metal-organic Framework with Active Cu(I) Sites PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (986 download)

DOWNLOAD NOW!


Book Synopsis Capture of Heavy Hydrogen Isotopes in a Metal-organic Framework with Active Cu(I) Sites by :

Download or read book Capture of Heavy Hydrogen Isotopes in a Metal-organic Framework with Active Cu(I) Sites written by and published by . This book was released on 2017 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of pure deuterium and the removal of tritium from nuclear waste are the key challenges in separation of light isotopes. Presently, the technological methods are extremely energy- and cost-intensive. Here we report the capture of heavy hydrogen isotopes from hydrogen gas by selective adsorption at Cu(I) sites in a metal-organic framework. At the strongly binding Cu(I) sites (32 kJ mol-1) nuclear quantum effects result in higher adsorption enthalpies of heavier isotopes. The capture mechanism takes place most efficiently at temperatures above 80 K, when an isotope exchange allows the preferential adsorption of heavy isotopologues from the gas phase. Large difference in adsorption enthalpy of 2.5 kJ mol-1 between D2 and H2 results in D2-over-H2 selectivity of 11 at 100 K, to the best of our knowledge the largest value known to date. Combination of thermal desorption spectroscopy, Raman measurements, inelastic neutron scattering and first principles calculations for H2/D2 mixtures allows the prediction of selectivities for tritium-containing isotopologues.

Interaction of Hydrogen Isotopes with Flexible Metal-organic Frameworks

Download Interaction of Hydrogen Isotopes with Flexible Metal-organic Frameworks PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (118 download)

DOWNLOAD NOW!


Book Synopsis Interaction of Hydrogen Isotopes with Flexible Metal-organic Frameworks by : Linda Bondorf

Download or read book Interaction of Hydrogen Isotopes with Flexible Metal-organic Frameworks written by Linda Bondorf and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Metal-Organic Framework Materials

Download Metal-Organic Framework Materials PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 1118931580
Total Pages : 1210 pages
Book Rating : 4.1/5 (189 download)

DOWNLOAD NOW!


Book Synopsis Metal-Organic Framework Materials by : Leonard R. MacGillivray

Download or read book Metal-Organic Framework Materials written by Leonard R. MacGillivray and published by John Wiley & Sons. This book was released on 2014-09-19 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-Organic Frameworks (MOFs) are crystalline compounds consisting of rigid organic molecules held together and organized by metal ions or clusters. Special interests in these materials arise from the fact that many are highly porous and can be used for storage of small molecules, for example H2 or CO2. Consequently, the materials are ideal candidates for a wide range of applications including gas storage, separation technologies and catalysis. Potential applications include the storage of hydrogen for fuel-cell cars, and the removal and storage of carbon dioxide in sustainable technical processes. MOFs offer the inorganic chemist and materials scientist a wide range of new synthetic possibilities and open the doors to new and exciting basic research. Metal-Organic Frameworks Materials provides a solid basis for the understanding of MOFs and insights into new inorganic materials structures and properties. The volume also reflects progress that has been made in recent years, presenting a wide range of new applications including state-of-the art developments in the promising technology for alternative fuels. The comprehensive volume investigates structures, symmetry, supramolecular chemistry, surface engineering, recognition, properties, and reactions. The content from this book will be added online to the Encyclopedia of Inorganic and Bioinorganic Chemistry: http://www.wileyonlinelibrary.com/ref/eibc

Advanced Structural Chemistry

Download Advanced Structural Chemistry PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 3527349006
Total Pages : 1088 pages
Book Rating : 4.5/5 (273 download)

DOWNLOAD NOW!


Book Synopsis Advanced Structural Chemistry by : Rong Cao

Download or read book Advanced Structural Chemistry written by Rong Cao and published by John Wiley & Sons. This book was released on 2021-06-28 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Structural Chemistry Discover the relationships between inorganic chemical synthesis, structure, and property with these comprehensive and insightful volumes Advanced Structural Chemistry: Tailoring Properties of Inorganic Materials and their Applications (3 Volume Set) offers readers the opportunity to discover the relationship between the structure and function of matter, develop efficient and precise synthesis methodology, and to understand the theoretical tools for new functional substances. Advanced Structural Chemistry clarifies the relationships between synthesis and structure, as well as structure and property, both of which are central to the creation of new materials with unique functions. In addition to subjects like the syntheses of metal-oxide clusters, metal-organic cages, and metal-organic frameworks with tailored optical, electric, ferroelectric, magnetic, adsorption, separation, and catalytic properties, the accomplished editor Rong Cao provides readers with information on a wide variety of topics, such as: Coordination-assembled metal-organic macrocycles and cages, including metallacycles and metallacages The structural chemistry of metal-oxo clusters, including the oxo clusters of transition metal, main group metal, and lanthanides Synthetic approaches, structural diversities, and biological aspects of molybdenum-based heterometallic sulfide clusters and coordination polymers Group 11-15 metal chalcogenides, including discrete chalcogenide clusters synthesized in ionic liquids The structures of metal-organic frameworks, including one-, two-, and three-dimensional MOFs Perfect for inorganic chemists, structural chemists, solid state chemists, material scientists, and solid state physicists, Advanced Structural Chemistry also belongs on the bookshelves of catalytic and industrial chemists who seek to improve their understanding of the structure and functions of inorganic materials.

Metal-Organic Frameworks

Download Metal-Organic Frameworks PDF Online Free

Author :
Publisher : CRC Press
ISBN 13 : 9814613460
Total Pages : 572 pages
Book Rating : 4.8/5 (146 download)

DOWNLOAD NOW!


Book Synopsis Metal-Organic Frameworks by : Jianwen Jiang

Download or read book Metal-Organic Frameworks written by Jianwen Jiang and published by CRC Press. This book was released on 2015-01-28 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-organic frameworks (MOFs) have emerged as a new family of nanoporous materials. With an enormous choice of inorganic/organic building blocks, MOFs possess a wide range of surface area, pore size, and functionality and, thus, have been considered versatile materials for many potential applications. This book presents a broad collection of rece

Isotope Separation and Isotope Exchange

Download Isotope Separation and Isotope Exchange PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.E/5 ( download)

DOWNLOAD NOW!


Book Synopsis Isotope Separation and Isotope Exchange by :

Download or read book Isotope Separation and Isotope Exchange written by and published by . This book was released on 1953 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Separation of Isotopes of Biogenic Elements in Two-phase Systems

Download Separation of Isotopes of Biogenic Elements in Two-phase Systems PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0080468098
Total Pages : 317 pages
Book Rating : 4.0/5 (84 download)

DOWNLOAD NOW!


Book Synopsis Separation of Isotopes of Biogenic Elements in Two-phase Systems by : Boris Mikhailovich Andreev

Download or read book Separation of Isotopes of Biogenic Elements in Two-phase Systems written by Boris Mikhailovich Andreev and published by Elsevier. This book was released on 2006-12-01 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Separation of Isotopes of Biogenic Elements provides a detailed overview of this area of research covering all aspects from the value of isotope effects to their practical use (equilibrium single-stage isotope effect - kinetics and mass transfer – multiplication of the single-stage isotope separation factor - technological peculiarity of processes) with the purpose of extraction from the natural mixture of the enriched and highly concentrated isotopes. In contrast to traditional books on the theory of isotope separation, the theoretical part of the book describes separation in two-phase processes in counter-flow columns. The experimental part of the book presents systematic analysis of specialists in the field of isotope separation in counter-flow columns. This book will be of interest to scientists, engineers and technical workers engaged in isotope separation processes and isotope application in nuclear physics, medicine, agro-chemistry, biology and other areas. This book may also be used in teaching theory and practical aspects in courses on physical chemistry and Isotope separation of light elements by physicochemical methods. * summarises current state of isotope research, especially biogenic elements* covering all aspects from the value of isotope effects to their practical use* of interest to scientists, engineers and technical workers engaged in isotope separation processes and isotope application

Interaction of Hydrogen Isotopes with Transition Metals and Intermetallic Compounds

Download Interaction of Hydrogen Isotopes with Transition Metals and Intermetallic Compounds PDF Online Free

Author :
Publisher : Springer
ISBN 13 : 3540486755
Total Pages : 170 pages
Book Rating : 4.5/5 (44 download)

DOWNLOAD NOW!


Book Synopsis Interaction of Hydrogen Isotopes with Transition Metals and Intermetallic Compounds by : B.M. Andreev

Download or read book Interaction of Hydrogen Isotopes with Transition Metals and Intermetallic Compounds written by B.M. Andreev and published by Springer. This book was released on 2006-04-11 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studying the interactions between heavy hydrogen isotopes and hydride forming metals or intermetallic compounds (IMC) is of importance for both fundamental and applied sciences. These systems offer, for example, the possibility of technical hydrogen isotope separation due to their considerable isotope effects. In addition, quite a lot of problems of hydrogen recovery, hydrogen purification, and tritium storage can be solved. This review deals with theoretical aspects of the interaction of heavy hydrogen isotopes with metals and IMC, and contains detailed information on phase and isotopic equilibrium and of the kinetics of isotope exchange in systems with hydride phases. Numerical data and results from theoretical and experimental studies are presented as well.

Porous Coordination Polymers

Download Porous Coordination Polymers PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0323955363
Total Pages : 429 pages
Book Rating : 4.3/5 (239 download)

DOWNLOAD NOW!


Book Synopsis Porous Coordination Polymers by : Nidhi Goel

Download or read book Porous Coordination Polymers written by Nidhi Goel and published by Elsevier. This book was released on 2024-01-26 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porous Coordination Polymers: From Fundamentals to Advanced Applications brings together the latest advances in Porous Coordination Polymers (PCPs) for cutting-edge applications. The book begins by introducing PCPs, highlighting their structure, chemistry, basic properties and design approaches. This is followed by a chapter focusing on synthesis methods and mechanical properties. Subsequent chapters provide in-depth coverage of specific target applications, explaining the preparation of PCPs for areas including catalysis and photocatalysis, environmental remediation, gas storage and separation, energy storage and conversion, new generation magnets, nanocarriers in therapeutics, and biomedical imaging. Finally, current challenges and future developments are considered in detail. Porous Coordination Polymers are gaining increasing interest due to their attractive properties, such as structural flexibility, large surface area, tailorable pore size, and functional tunability, in turn enabling a wide range of possible applications which this book aims to highlight and to elucidate. This is a valuable resource for researchers and advanced students across polymer science, inorganic chemistry, environmental science, and materials science and engineering, as well as engineers, scientists, and R&D professionals with an interest in porous coordination polymers (PCPs) and novel polymeric materials for advanced industrial applications. Explores porous coordination polymers in detail while highlighting key ideas. Provides in-depth discussion of the design and development of new porous coordination polymers. Addresses present issues and looks at potential future developments in this innovative field.

Metal Organic Frameworks

Download Metal Organic Frameworks PDF Online Free

Author :
Publisher : MDPI
ISBN 13 : 303928486X
Total Pages : 198 pages
Book Rating : 4.0/5 (392 download)

DOWNLOAD NOW!


Book Synopsis Metal Organic Frameworks by : Victoria Samanidou

Download or read book Metal Organic Frameworks written by Victoria Samanidou and published by MDPI. This book was released on 2020-03-27 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal–organic frameworks are among the most promising novel materials. The concept of MOFs was first introduced in 1990. They were actually initially used in catalysis, gas separation, membranes, electrochemical sensors. Later on, they were introduced as SPE sorbents for PAHs (Polycyclic Aromatic Hydrocarbons) in environmental water samples, then the range expanded to the field of analytical chemistry, both in chromatographic separation and sample preparation, with great success in, e.g., SPE and SPME (Solid Phase Mico-extraction). Since then, the number of analytical applications implementing MOFs as sorbents in sorptive sample preparation approaches is increasing. Τhis is reinforced by the fact that, at least theoretically, an infinite number of structures can be designed and synthesized, thus making tuneability one of the most unique characteristics of MOF materials. Moreover, they have been designed in various shapes, such as columns, fibers, and films, so that they can meet more analytical challenges with improved analytical features.Their exceptional properties attracted the interest of analytical chemists who have taken advantage of the unique structures and properties and have already introduced them in several sample pretreatment techniques, such as solid phase extraction, dispersive SPE, magnetic solid phase extraction, solid phase microextraction, stir bar sorptive extraction, etc.

Separation of Hydrogen Isotopes

Download Separation of Hydrogen Isotopes PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (45 download)

DOWNLOAD NOW!


Book Synopsis Separation of Hydrogen Isotopes by : Howard K. Rae

Download or read book Separation of Hydrogen Isotopes written by Howard K. Rae and published by . This book was released on 1978 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: