Behavior and performance of adsorptive natural gas storage cylinders during discharge

Chang, Kuo-Chyang; Talu, Orhan

doi:10.1016/1359-4311(95)00017-8

Cited by 118 publications

(97 citation statements)

References 10 publications

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“…Second, as the ligands prefer a different conformation in the absence of gas, the ligand conformation change is endothermic; the ligand rotations consequently consume (provide) some of the heat released (consumed) upon adsorption (desorption). Such intrinsic heat management mitigates working capacity losses during the pressure swing that arise due to temperature changes of the adsorbent (46).…”

mentioning

confidence: 99%

Statistical mechanical model of gas adsorption in porous crystals with dynamic moieties

Simon

Braun

Carraro

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Some nanoporous, crystalline materials possess dynamic constituents, for example, rotatable moieties. These moieties can undergo a conformation change in response to the adsorption of guest molecules, which qualitatively impacts adsorption behavior. We pose and solve a statistical mechanical model of gas adsorption in a porous crystal whose cages share a common ligand that can adopt two distinct rotational conformations. Guest molecules incentivize the ligands to adopt a different rotational configuration than maintained in the empty host. Our model captures inflections, steps, and hysteresis that can arise in the adsorption isotherm as a signature of the rotating ligands. The insights disclosed by our simple model contribute a more intimate understanding of the response and consequence of rotating ligands integrated into porous materials to harness them for gas storage and separations, chemical sensing, drug delivery, catalysis, and nanoscale devices. Particularly, our model reveals design strategies to exploit these moving constituents and engineer improved adsorbents with intrinsic thermal management for pressure-swing adsorption processes.metal-organic frameworks | flexible metal-organic frameworks | statistical mechanics | porous materials | gas storage M etal-organic frameworks (MOFs) are porous, crystalline materials with very large internal surface areas (1). The consequent adsorption properties of MOFs have demonstrated promise toward solving paramount energy problems (2) such as in gas storage (3) and gas separations (4). MOFs are also being explored for chemical sensing (5), drug delivery (6), and catalysis (7). In the synthesis of MOFs, metal nodes or clusters and organic linker molecules self-assemble (8). Owing to their modular and versatile chemistry, tens of thousands of MOFs have been synthesized (9).Some MOFs are dynamic/flexible and respond to gas molecules adsorbing into their pores by exhibiting structural changes while retaining their crystallinity (reviews in refs. 10-14). Reported modes of guest-induced structural changes in MOFs include breathing (15), swelling (16), and subnetwork displacement (17), as well as less dramatic changes, such as the rotation of a ligand (18) or deformation (19). In molecular recognition and enzyme catalysis in biology, a conformation change of the enzyme is often involved in substrate binding (20,21). Responsive, dynamic constituents thus may endow MOFs with enzymelike selectivities (11) for selective gas adsorption, chemical sensing, and catalysis.In the long run, a more intimate understanding of MOFs with moving parts may enable the construction of molecular machines (22). Because of their crystallinity and tunability, MOFs are an ideal scaffold on which to organize machine subunits and tune their response to stimuli. Notably, Zhu et al. (23) used a [2] rotaxane molecular switch as a building block in a MOF to construct a conceptual molecular machine.Several reported MOFs possess dynamic constituents, e.g., bridging ligands that can rotate, while maintaini...

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mentioning

confidence: 99%

Statistical mechanical model of gas adsorption in porous crystals with dynamic moieties

Simon

Braun

Carraro

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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“…In the ANG storage system, natural gas is adsorbed by the porous adsorbents and it is subjected to thermal effects due to both heat of adsorption and desorption. Experimental investigations reported in the literature describe many different techniques to improve the thermal effects; however there is no enhanced solution found in the literature [5][6][7][8][9][10][11][12][13] . Therefore, this study is motivated to investigate the ANG storage system with enhanced thermal management.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, adsorbed natural gas (ANG) has attracted much attention as a possible alternative to the conventional storage techniques such as compressed natural gas (CNG) or liquefied natural gas (LNG) [1][2][3][4][5][6][7][8][9][10][11][12][13] . The ANG storage system operates at much lower pressure than the CNG method and stores gas at ambient condition with no cryo-cooling like the LNG storage.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Adsorbed Natural Gas Storage System With Enhanced Thermal Management

Rahman

Loh

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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An adsorbed natural gas (ANG) storage system with internal thermal control, based on fin and tube type heat exchanger is investigated in this study. The adsorbent bed, which consists of Maxsorb III activated carbon packed in between copper fins and tubes, is demonstrated to study the storage capacity and thermal management of the ANG storage system. The cylinder is pressurized up to 35 bar and water is circulated through the tubes during charge process for quick removal of adsorption heat, thus to increase the storage capacity. Similarly, the adsorbent bed is heated up during discharge process to maximize the gas delivery. The current experimental arrangement presented shows higher storage capacity and better thermal management than the adsorbent bed without fin and tube arrangement.

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“…There are several aspects that influence the performance of ANG storage (Pupier et al, 2005), namely the nature of the microporous solid (Biloe et al, 2002;Lozano-Castelló et al, 2002a;Lozano-Castello et al, 2002b;Matranga et al, 1992), the packing adsorbent scale (Biloe et al, 2001a;Burchell & Rogers, 2001;MacDonald & Quinn, 1998), the scale of ANG vessel (Biloe et al, 2001b;Chang & Talu, 1996) and the influence of the composition of natural gas during successive cycles of charge and discharge (Dvorak & Hodrien, 2001;Mota, 1999;Pupier et al, 2005;Seki & Sumie, 2001). …”

Section: Introductionmentioning

confidence: 99%

“…The adsorption process consists of adsorption (charge to adsorbent) and desorption (discharge from adsorbent). Characteristics of the adsorption-desorption process are among the parameters used to determined ANG performance (Chang & Talu, 1996;Santos et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Effect of Methane Gas Flow Rate on Adsorption Capacity and Temperature Distribution of Activated

Alhamid¹,

Nasruddin²,

Senoadi³

et al. 2015

IJTech

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Adsorbed Natural Gas (ANG) is one of the gas storage methods which specialize in low pressure. This method is more competitive compared to Compressed Natural Gas (CNG). ANG is based on an adsorption process that involves adsorbate and adsorbent. This research is conducted to observe the effects of gas flow-rate on adsorption capacity and the temperature distribution of adsorbent. The adsorbent is a commercially activated carbon, and methane gas is the adsorbate. Methane flow rates are 1 standard liter per minute (SLPM) and 20 SLPM. Temperature in the pressure vessel is maintained at 25°C and the pressure at 3.5 MPa. The result shows that the adsorption capacity of activated carbon is higher at a lower gas flow rate. While a higher gas flow rate causes a higher temperature difference in the adsorption and in desorption process.

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Behavior and performance of adsorptive natural gas storage cylinders during discharge

Cited by 118 publications

References 10 publications

Statistical mechanical model of gas adsorption in porous crystals with dynamic moieties

Statistical mechanical model of gas adsorption in porous crystals with dynamic moieties

Experimental Investigations of Adsorbed Natural Gas Storage System With Enhanced Thermal Management

Effect of Methane Gas Flow Rate on Adsorption Capacity and Temperature Distribution of Activated

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