Pore size distribution and supercritical hydrogen adsorption in activated carbon fibers

Purewal, Justin; Kabbour, Houria; Vajo, John J.; Ahn, Channing C.; Fultz, B.

doi:10.1088/0957-4484/20/20/204012

Cited by 26 publications

(23 citation statements)

References 21 publications

(31 reference statements)

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“…The pore-size distribution (left) and relative filling (right) of CNS-201 (black), MSC-30 (red), ZTC "P7(2)-H" (blue), and ZTC-3 (purple), calculated by the NLDFT method. 4,5,9,10 It has been proposed that 1.14 nm is the optimal spacing between graphene layers for maximum adsorption uptake of methane. 11,12 The pore-size distribution of ZTC-3 has a mean pore-width close to this value, shown as a gray line in Figure S1.…”

Section: Dft Pore-size Comparisonmentioning

confidence: 99%

“…9,13,14 The apparatus was equipped with a digital cold cathode pressure sensor (I-MAG, Series 423), a highresolution pressure manometer (MKS Baratron, Model 120AA), a high pressure manometer (MKS Baratron, Model 833), and a molecular drag pump to achieve a measurable pressure range of 10 -5 to 10 7 Pa. Temperature was measured on the wall of the manifold and on the outer wall of the sample holder using K-type thermocouples and platinum resistance thermometers (PRTs).…”

Section: Methane Adsorption Measurements and Cyclingmentioning

confidence: 99%

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Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

et al. 2013

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A thermodynamic study of the enthalpy of adsorption of methane on high surface area carbonaceous materials was carried out from 238 to 526 K. The absolute quantity of adsorbed methane as a function of equilibrium pressure was determined by fitting isotherms to a generalized Langmuir-type equation. Adsorption of methane on zeolite-templated carbon, an extremely high surface area material with a periodic arrangement of narrow micropores, shows an increase in isosteric enthalpy with methane occupancy; i.e., binding energies are greater as adsorption quantity increases. The heat of adsorption rises from 14 to 15 kJ/mol at near-ambient temperature and then falls to lower values at very high loading (above a relative site occupancy of 0.7), indicating that methane/ methane interactions within the adsorption layer become significant. The effect seems to be enhanced by a narrow pore-size distribution centered at 1.2 nm, approximately the width of two monolayers of methane, and reversible methane delivery increases by up to 20% over MSC-30 at temperatures and pressures near ambient.

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Section: Dft Pore-size Comparisonmentioning

confidence: 99%

Section: Methane Adsorption Measurements and Cyclingmentioning

confidence: 99%

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

et al. 2013

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“…From the results, it is concluded that the actual order of the hydrogen storage capacity is highly, as is that of the micropore volume. It is suggested that the microporous cavities on the MWNT surfaces offer an attraction force for hydrogen molecules [37]. Therefore, the hydrogen storage capacity of the Pt-loaded activated MWNTs, under common operating conditions (298 K/100 bar), can be attributed to the micropore that exists within favorable sites in the defective surface.…”

Section: Hydrogen Uptake Capacitiesmentioning

confidence: 99%

Influence of CO2 activation on hydrogen storage behaviors of platinum-loaded activated carbon nanotubes

Lee

Park

2010

Journal of Solid State Chemistry

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“…metal-hydrogen sulfide reaction. (Xiao, Wang et al 2008) 2 Representative value based on distributed range (Cao, Wang et al 2002;Purewal, Kabbour et al 2009) The zinc concentration of ORM TM was also higher than the zinc concentration of TDRP TM . This difference may be another reason for the difference in adsorption capacities.…”

Section: Figure 7 Breakthrough Capacity Of Orm Tm and Tdrp Tmmentioning

confidence: 99%

Biogas Hydrogen Sulfide Adsorption using Waste Tire Media Products

Wang¹,

Evans²,

Ellis³

2010

proc water environ fed

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Anaerobic waste treatment systems, including municipal digesters; industrial high-rate wastewater treatment systems; landfills; and solid waste reactors, convert energy rich organic compounds into valuable methane gas. Unfortunately, hydrogen sulfide often contaminates biogas resulting in problems with corrosion, health and safety issues, and SOx potential. A waste product from tires, tire derived rubber product (TDRP TM ), was discovered to possess the capacity to remove hydrogen sulfide from biogas. .An in-depth study was undertaken to better understand the fundamental physical characteristics of TDRP TM , and to learn more about the mechanism of hydrogen sulfide adsorption. Another rubber waste product, other rubber product (ORM TM ) was also researched. The TDRP TM and ORM TM was found to have a bulk density near 0.3 kg/m 3 , a particle density near 1 kg/m 3 , a moisture content near 1%, a carbon black content between 40 and 50%, and a surface area between 0.2 and 0.3 m 2 /g. Additionally, TDRP TM was found to contain a variety of trace metals including calcium, magnesium, iron, zinc, copper, and lead. Scanning electron microscopy was used to show the surface was rich with metals, sulfur, and oxygen. A comparison between TDRP TM and activated carbon was performed; it shows that the adsorption mechanism is different as a result of three orders of magnitudes difference in the ratio of relative adsorbed hydrogen sulfide to specific surface area. The effects of moisture content, zinc concentration, and surface oxidation on adsorption favor chemical reactions occurring on the surface of the TDRP TM and ORM TM samples. Analysis of experimental results and comparison to scientific literature, suggest that two components contribute to the H 2 S adsorption--carbon black and zinc. The addition and extraction of zinc altered the H 2 S adsorption capacity. Oxidation of the surface of TDRP TM and ORM TM also improved the adsorption capacity.

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Pore size distribution and supercritical hydrogen adsorption in activated carbon fibers

Cited by 26 publications

References 21 publications

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

Influence of CO2 activation on hydrogen storage behaviors of platinum-loaded activated carbon nanotubes

Biogas Hydrogen Sulfide Adsorption using Waste Tire Media Products

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