Evaluating methane adsorbed film densities on activated carbon in dynamic systems

Prosniewski, Matthew; Gillespie, Andrew; Knight, Ernest; Rash, Tyler; Stalla, David; Romanos, Jimmy; Smith, Adam M.

doi:10.1016/j.est.2018.10.017

Cited by 11 publications

(10 citation statements)

References 22 publications

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“…It is crucial to consider the volume of CH4 delivery to assess the performance of the AC samples for the ANG application [49]. The term of working capacity or the deliverable capacity describes the difference in the adsorbed amount of CH4 in the pressure range of 35 and 5 bar at the ambient temperature.…”

Section: Samplementioning

confidence: 99%

“…In the second experiment, the ANG cell, which was under the vacuum condition, was filled with CH4 up to 40 bar, and after the system reached the equilibrium, it was discharged from 40 bar down to the atmospheric pressure (~1 bar). The rest of the cycles, up to ten cyclic tests, were carried out without evacuation in the range of (1 to 40) bar [49]. The obtained results are shown in Figure 12.…”

Section: Cyclic Operationmentioning

confidence: 99%

See 1 more Smart Citation

Superior performance of modified pitch-based adsorbents for cyclic methane storage

Mirzaei

Ahmadpour

Shahsavand

et al. 2020

Journal of Energy Storage

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Section: Samplementioning

confidence: 99%

Section: Cyclic Operationmentioning

confidence: 99%

Superior performance of modified pitch-based adsorbents for cyclic methane storage

Mirzaei

Ahmadpour

Shahsavand

et al. 2020

Journal of Energy Storage

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“…Slit-shaped pores of these materials lead to higher storage than any other geometries. 29,32,33 The interconnected network of microand mesopores potentially eases the adsorbate transfer within micropores. 34 Narrow micropores with a size <1 nm can store only one layer of the gas.…”

Section: Introductionmentioning

confidence: 99%

Suitability analysis of sustainable nanoporous adsorbents for higher biomethane adsorption and storage applications

Adlak

Chandra

Vijay

et al. 2022

Intl J of Energy Research

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Summary Compatible pore structure of activated carbons (AC) has important role in development of adsorbed natural gas (ANG) technology. ANG has attracted attention due to mild storage conditions which makes it more easy in operation. Porous materials have played a significant role for the storing the methane rich gas on the surface. Therefore, their synthesis with compatible structures has a vital role in technological development. Activation of biomass/biochar with KOH produces hierarchical porous networks as required. However, based on the nature of biomass yields different types of porosity. Therefore, to examine it further, we have selected 10 different biomasses, especially waste for AC production. These prepared carbons were then analyzed with different techniques such as Brunauer‐Emmett‐Teller, X‐ray diffraction, scanning electron microscope, and FT‐infrared. AC produced from coconut and pistachio shells that are hard in nature are found to produce pore structure in relevant width size range for methane adsorption. Whereas other softer biomass tended to have wider pore distribution relatively. The highest volumetric ratio of ~251 v/v (uptake) and ~217 v/v (delivery) has been recorded on coconut shell AC, whereas the highest gravimetric uptake of ~0.32 g/g at 6.5 MPa recorded on karanja shell AC. Furthermore, all the properties impacting the adsorption are discussed in the view of ANG technology. Highlights Ten different waste biomass has been utilized to produce activated carbons. Methane adsorption studies are carried out to find the most competent material. Coconut shell‐based carbons have shown the best storage and release capacities amongst all. Hardness in the physical nature gives narrower pore size distribution, whereas softer biomass produces wider pore distribution. Softer biomass such as agro‐residues is to be avoided for the use of methane storage.

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“…The challenges of accurately modeling the adsorbate-adsorbent interaction and the fine tuning of simulation parameters make this a continuous process as new types of pores are synthesized by laboratories all over the world. For example, groups at the University of Missouri (MU) have made promising starts creating ANG prototypes 11,[15][16][17][18][19][20] . Table 1.1 and Figure 1.1 directly compare the performance of ANG and CNG tanks.…”

Section: Models and Simulations Of Ang Are Thus Important For Underst...mentioning

confidence: 99%

“…Carbon nanostructures vastly vary in their manifestations which include amorphous activated carbons (AC) [2][3][4] , metal organic frameworks (MOFs) 5,6 , covalent organic frameworks (COFs) 7,8 and graphene oxide frameworks (GOFs) 9,10 . Carbon nanostructures typically have sizeable specific surface areas (SSA) that correlate to high storage capacities due to the attraction of various gas molecules to those surfaces; this being the reason why these gases are packed much more tightly than they would be in empty space (in fact, the adsorbed film has gas densities comparable to the same substance in the liquid state 11,12 even though the gas is at temperatures much higher than its critical temperature!). Carbon materials are particularly useful because these nanostructures' SSAs are often close to the maximum limit, i.e., to that of graphene (2,600 m 2 /g), and for some materials the pore sizes are close to 1 nm, where there is some overlap in the attraction of the gas molecules to both surfaces.…”

Section: Chapter 1: Introduction 11 Motivationmentioning

confidence: 99%

Computational studies of gases adsorbed on graphene-like materials

Lombardi¹

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Nanoporous activated carbons generate interest for their gas storage and separation potential. Generally, adsorbents are assumed rigid, even though they are formed by feeble quasi-2D flakes of graphene. In 2019, Schaeperkoetter et al.^1 observed swelling of graphene oxide frameworks (GOFs) upon supercritical adsorption of various gases. We performed molecular dynamics (MD) simulations of methane and xenon in various models of GOF's with interaction parameters derived from ab initio Density Functional Theory. We observe a monotonic increase of the interlayer spacing consistent with experiments only for a model of benzene-1,4-diboronic acid (DBA) molecules bonded covalently to graphene on both sides of the pore at random orientations, establishing the structure of the DBA-GOFs. Adsorbents are also useful for the separation of gases, e.g., methane and carbon dioxide from organic waste biogas. We performed MD and grand canonical Monte Carlo simulations of the coadsorption of CH4 and CO2 in pores of different sizes and surface functionalization. We observe significant selectivity for the adsorption of CO2 - potentiated by the presence of polar surface groups and determined optimal conditions for gas separation in this system. Finally, atomically flat graphene allows the emergence of two-dimensional films of weakly adsorbed helium with interesting quantum properties. We performed ab initio 2nd order Moller-Plesset calculations with large basis sets of the interaction of 1, 2, and 3 He atoms on graphene-like systems. The interaction parameters are then used in the Bose-Hubbard model, and under certain conditions it is predicted that superfluid or Mott insulating phases can occur.

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Evaluating methane adsorbed film densities on activated carbon in dynamic systems

Cited by 11 publications

References 22 publications

Superior performance of modified pitch-based adsorbents for cyclic methane storage

Superior performance of modified pitch-based adsorbents for cyclic methane storage

Suitability analysis of sustainable nanoporous adsorbents for higher biomethane adsorption and storage applications

Computational studies of gases adsorbed on graphene-like materials

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