Adsorption Equilibria of Nitrogen, Methane, and Ethane on BDH-Activated Carbon

Al‐Muhtaseb, Shaheen A.; Al‐Rub, Fahmi A. Abu; Zarooni, Mohamed Al

doi:10.1021/je060215+

Cited by 24 publications

(35 citation statements)

References 9 publications

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“…Many research works on methane adsorption in carbon‐based adsorbents have been published, and a large number of these works include high‐pressure methane adsorption. The literature data on methane adsorption at high pressure is limited to around 25 to 60 bar and occasionally up to 140–150 bars for coal‐ or shell‐based low‐surface‐area materials that are essentially sufficient for ANG technology. However, from a scientific point of view, there are other interests in studying methane adsorption at extremely high pressures.…”

Section: Introductionmentioning

confidence: 99%

“…[16] Many research works on methane adsorption in carbonbased adsorbentsh ave been published,a nd al arge number of these works include high-pressure methane adsorption. Thel iterature data on methane adsorption at high pressure is limited to around 25 to 60 bar [17][18][19][20][21][22][23][24][25] and occasionallyu pt o 140-150 bars for coal-or shell-based low-surface-area materials [26,27] that are essentially sufficient for ANG technology. However, from as cientific point of view,t here are other interests in studying methane adsorption at extremely high pressures.F or example,a tv ery high pressure,m ethanec ould occupylarger pores and demonstrate unusual enthalpy of adsorption values.I ns pecific needs,f or example,f or long driving ranges or small tank volumes,h igh-pressure ANG tanks can provide higherm ethanes torage in al ess hazardous environmentc omparedt ocompressed bulk storage.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Methane Adsorption in Micro–Mesoporous Carbons at Low and Ultra‐High Pressure

2016

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Adsorbed natural gas (ANG) provides a better alternative for onboard storage of methane. We have measured methane adsorption at low pressure (∼1 bar) and ultrahigh pressure (∼400 bar) for three different micro‐mesoporous carbons. The highest methane uptake was below 70 % in near‐ambient temperature and 400 bar, or 25 % at 35 bar. Although gravimetric uptake is lower than the Department of Energy (DoE) target, a comparative study suggests that this adsorption amount is higher than that of most of the metal–organic frameworks (MOFs) and all covalent–organic frameworks (COFs). The highest volumetric methane uptake was above 500 v/v at ca. 400 bar or ∼200 v/v at 35 bar (293 K), which exceeded the DoE volumetric target for methane storage and is higher than most MOFs and COFs. Heat of adsorption values are within the range of 38 to 21 kJ mol−1 in the low‐adsorption regime, higher than most MOFs or COFs. The overall results suggest that carbon‐based adsorbents still remain the most promising adsorbents for the ANG process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristics of Methane Adsorption in Micro–Mesoporous Carbons at Low and Ultra‐High Pressure

2016

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“…In the second part, the PSDs of BDH activated carbon were determined with regard to its adsorption of ethane, methane and nitrogen at different temperatures (Al-Muhtaseb et al 2007). This activated carbon is a commercial adsorbent.…”

Section: Methodsmentioning

confidence: 99%

“…This method allowed us to determine the four parameters in equation 17, namely, n, N m , E 0 and s. Our objective is to obtain the correct values of these four parameters. This result is based on the values of the average relative error (ARE), which is given as follows (Al-Muhtaseb et al 2007):…”

Section: Determination Of Aed Using a Statistical Physics Treatmentmentioning

confidence: 99%

Adsorption Energy and Pore-Size Distributions of Activated Carbons Calculated Using Hill's Model

Torkia

Bouaziz

Al‐Muhtaseb

et al. 2014

Adsorption Science & Technology

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An integral equation derived using a statistical physics treatment by considering the adsorption energy distribution (AED) was used to model the adsorption of ethylene and ethane on resorcinol-formaldehyde-based activated carbon xerogels. Hill's model was taken as a local adsorption isotherm. This model was based on a grand canonical ensemble. Then a relationship between the energetic and the structural heterogeneities is used to determine the pore-size distribution (PSD) function. The AED and PSD obtained illustrate the greater affinity of activated carbon for adsorption of ethylene compared to ethane. In addition, this method was applied to determine the PSD of the British Drug House (BDH) activated carbon. The behaviour of the obtained PSDs at different temperatures was examined and related to the adsorption capacity of BDH activated carbon towards ethane, methane and nitrogen.

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“…Finally, the extended Langmuir model is presented in eq : , where the adsorption affinity is calculated as in which the isosteric heat of adsorption is determined using the Clausius–Clapeyron equation: …”

Section: Vpsa Mathematical Modelmentioning

confidence: 99%

Upgrade of Low-Concentration Oxygen-Bearing Coal Bed Methane by a Vacuum Pressure Swing Adsorption Process: Performance Study and Safety Analysis

Zhou¹,

Fu²,

Shen³

et al. 2016

Energy Fuels

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The recovery of methane from oxygen-bearing coal bed methane (CBM) (25% CH4/65% N2/10% O2) by vacuum pressure swing adsorption (VPSA) was studied systematically in this work. Nevertheless, it is difficult to implement systematic safety investigations of the process just by bench-scale experiments and pilot plants. Emphasis was placed on the construction of a new way to analyze process safety based on a developed explosive triangle theory that could be able to provide guidance for comprehensive safety evaluation in the VPSA process for upgrading of oxygen-bearing CBM. The simulation results revealed that a two-column seven-step VPSA process not only could generate 50.40% CH4 purity with 86.3% product recovery but also could achieve higher product productivity of 1.494 (mol of CH4)·kgads –1·h–1 and lower energy consumption of 0.179 kWh·Nm–3 feed as well. The results of the safety analysis procedure according to the simulation results demonstrated that the flammability zone distribution mainly exists in the adsorption, pressure equalization, replacement, and pressurization steps and varied regularly with each step time and axial distance. A two-stage VPSA process with nitrogen dilution of the feed gas that is able to achieve safe operation in a further separation system was well-verified through simulative investigation.

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Adsorption Equilibria of Nitrogen, Methane, and Ethane on BDH-Activated Carbon

Cited by 24 publications

References 9 publications

Characteristics of Methane Adsorption in Micro–Mesoporous Carbons at Low and Ultra‐High Pressure

Characteristics of Methane Adsorption in Micro–Mesoporous Carbons at Low and Ultra‐High Pressure

Adsorption Energy and Pore-Size Distributions of Activated Carbons Calculated Using Hill's Model

Upgrade of Low-Concentration Oxygen-Bearing Coal Bed Methane by a Vacuum Pressure Swing Adsorption Process: Performance Study and Safety Analysis

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