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M. Douglas LeVan

Bio: M. Douglas LeVan is an academic researcher from Vanderbilt University. The author has contributed to research in topics: Adsorption & Activated carbon. The author has an hindex of 29, co-authored 99 publications receiving 4071 citations.


Papers
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BookDOI
01 Jan 1996

558 citations

Journal ArticleDOI
TL;DR: In this article, anon exchange was performed on NaY and NaX zeolites with alkali metal cations Li+, K+, Rb+, and Cs+ and studied by adsorption of CO2.

446 citations

Journal ArticleDOI
13 Aug 2010-Langmuir
TL;DR: Metal-organic frameworks for removal of carbon dioxide from gases containing water vapor, such as flue gas, are considered, because of their permanent porous structures, huge surface areas, and potential applications as novel adsorbents and catalysts.
Abstract: Metal−organic frameworks (MOFs) have recently attracted intense research interest because of their permanent porous structures, huge surface areas, and potential applications as novel adsorbents and catalysts. In order to provide a basis for consideration of MOFs for removal of carbon dioxide from gases containing water vapor, such as flue gas, we have studied adsorption equilibrium of CO2, H2O vapor, and their mixtures and also rates of CO2 adsorption in two MOFs: HKUST-1 (CuBTC) and Ni/DOBDC (CPO-27-Ni or Ni/MOF-74). The MOFs were synthesized via solvothermal methods, and the as-synthesized products were solvent exchanged and regenerated before experiments. Pure component adsorption equilibria and CO2/H2O binary adsorption equilibria were studied using a volumetric system. The effects of H2O adsorption on CO2 adsorption for both MOF samples were determined, and the results for 5A and NaX zeolites were included for comparison. The hydrothermal stabilities for the two MOFs over the course of repetitive me...

381 citations

Journal ArticleDOI
TL;DR: Adsorption isotherms for pure carbon dioxide and water vapor on 5A and 13X zeolite beads and silica gel granules are reported in this article, where all pure component equilibria are described well by Toth isotherm with parameters having temperature dependence.
Abstract: Adsorption isotherms are reported for pure carbon dioxide and water vapor on 5A and 13X zeolite beads and silica gel granules. These data were obtained using a volumetric method and cover the temperature ranges of (−45 to 175) °C for carbon dioxide and (0 to 100) °C for water. Also, pure carbon dioxide isotherms on silica gel at temperatures from (10 to 55) °C were measured using a gravimetric apparatus. All pure component equilibria are described well by Toth isotherms with parameters having temperature dependence. For carbon dioxide adsorption, zeolites 5A and 13X have similar loadings and show a much higher capacity than silica gel. However, for water vapor, zeolite 13X has a slightly higher capacity than zeolite 5A. Both zeolites have very good adsorption capacities for water vapor at low pressures but lose their advantages to silica gel when water pressures are high.

290 citations

BookDOI
01 Jan 1989
TL;DR: In this article, a two-patch heterogeneous model with surface phase transition for benzene adsorption on silicalite is presented, where the authors use stochastic pore networks to model the correlation of equilibrium data.
Abstract: I. Characterization of Adsorbents and Tthermodynamics of Adsorption.- Characterization of adsorbents.- Theories of adsorption in micropores.- The statistical thermodynamic approach to the correlation of equilibrium data.- A two-patch heterogeneous model with surface phase transition for benzene adsorption on silicalite.- Interpretation of low temperature gas adsorption and desorption using stochastic pore networks.- Adsorption of n-hexane and 3-methylpentane on zeolites Y and ZSM 20.- II. Kinetics of Adsorption and Fixed-Bed Processes.- Adsorption kinetics.- Dynamics of fixed-bed adsorbers. Isothermal adsorption of single components.- Asymptotic fixed-bed behavior: proportionate and constant patterns.- Pore scale hydrodynamics.- Separation processes based on electrosorption phenomena.- Adsorptive reactors.- Design aspects of fixed-bed adsorption processes.- Numerical methods for the solution of adsorption models.- III. Cyclic Processes and Simulated Moving Beds.- Gas separation by pressure swing adsorption using carbon molecular sieves.- Pressure swing adsorption technology.- Modeling and simulation of rate induced PSA separations.- Thermal swing adsorption.- On countercurrent adsorption separation processes.- Sorbex: continuing innovation in liquid phase adsorption.- IV. Applications in Biotechnology and Environmental Engineering.- The use of granular activated carbon for potable water treatment as an example of liquid phase applications of activated carbon.- Breakthrough time of organic vapours in activated carbon filters as a function of the air flow pattern.- Continuous adsorption in biotechnology.- Continuous chromatographic processes.- Biochemical reaction and separation in chromatographic columns.- Some factors involved in scale-up of industrial biotechnological adsorption processes.- Development of physical and mathematical modelling for scale-up of batch stirred tank and packed-bed column adsorption and chromatographic units.- Optimisation of adsorption techniques for the purification of biomolecules.- Gel filtration chromatography.- Adsorption chromatography for protein purification.- List of Lecturers and Participants.

199 citations


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08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Journal ArticleDOI
TL;DR: Kenji Sumida, David L. Rogow, Jarad A. Mason, Thomas M. McDonald, Eric D. Bloch, Zoey R. Herm, Tae-Hyun Bae, Jeffrey R. Long
Abstract: Kenji Sumida, David L. Rogow, Jarad A. Mason, Thomas M. McDonald, Eric D. Bloch, Zoey R. Herm, Tae-Hyun Bae, Jeffrey R. Long

5,389 citations

Journal ArticleDOI
TL;DR: From a comprehensive literature review, it was found that some LCAs, in addition to having wide availability, have fast kinetics and appreciable adsorption capacities too.

3,163 citations

Journal ArticleDOI
TL;DR: The CO(2) adsorption behavior of several different classes of solid carbon dioxide adsorbents, including zeolites, activated carbons, calcium oxides, hydrotalcites, organic-inorganic hybrids, and metal-organic frameworks are described.
Abstract: Since the time of the industrial revolution, the atmospheric CO(2) concentration has risen by nearly 35 % to its current level of 383 ppm. The increased carbon dioxide concentration in the atmosphere has been suggested to be a leading contributor to global climate change. To slow the increase, reductions in anthropogenic CO(2) emissions are necessary. Large emission point sources, such as fossil-fuel-based power generation facilities, are the first targets for these reductions. A benchmark, mature technology for the separation of dilute CO(2) from gas streams is via absorption with aqueous amines. However, the use of solid adsorbents is now being widely considered as an alternative, potentially less-energy-intensive separation technology. This Review describes the CO(2) adsorption behavior of several different classes of solid carbon dioxide adsorbents, including zeolites, activated carbons, calcium oxides, hydrotalcites, organic-inorganic hybrids, and metal-organic frameworks. These adsorbents are evaluated in terms of their equilibrium CO(2) capacities as well as other important parameters such as adsorption-desorption kinetics, operating windows, stability, and regenerability. The scope of currently available CO(2) adsorbents and their critical properties that will ultimately affect their incorporation into large-scale separation processes is presented.

2,149 citations