Optimization of structural and energy characteristics of adsorbents for methane storage

Меньщиков, И. Е.; Фомкин, А. А.; Школин, А. В.; Yakovlev, V. Yu.; Khozina, E. V.

doi:10.1007/s11172-018-2294-1

Cited by 23 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the adsorption in the system progresses, the system energy fluctuation gradually stabilises, so it can be used to judge the system balance [45,46]. Figure 5 shows the change in system energy with time during dynamics relaxation.…”

Section: Dynamics Relaxationmentioning

confidence: 99%

Adsorption of phosphate by cancrinite in red mud: a first-principles study

Zhou

Qiu

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

Cancrinite is the key substance that affects the adsorption effect of phosphate from red mud(RM) . Therefore, cancrinite in RM was modified to improve its adsorption performance. Based on density functional theory(DTF), this paper optimized the structure of cancrinite, the main component of red mud, modified the cancrinite with sodium dodecyl benzene sulfonate, and studied the surface wettability changes of cancrinite before and after modification through dynamics relaxation. The effects of wetting modification on the adsorption properties of cancrinite were studied by molecular dynamics simulation of radial distribution function, adsorption site , adsorption energy and mean square displacement. Research shows that modified cancrinite Surface wettability increased by 77%, also has more adsorption sites, adsorption energy is smaller, diffusion process is accelerated, so the adsorption capacity is stronger. This study lays a theoretical foundation for enhancing the adsorption of phosphate from wastewater by RM.

show abstract

Section: Dynamics Relaxationmentioning

confidence: 99%

Adsorption of phosphate by cancrinite in red mud: a first-principles study

Zhou

Qiu

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…Therefore, new technological solutions are required to increase the energy density of NG, and an adsorbed NG (ANG) method seems to be the most effective one for accumulation and storage [9][10][11]. Based on a rich set of experimental data reported over the past twenty years [11][12][13][14][15][16][17][18], activated carbons and metal-organic framework structures are recognized as the most promising adsorbents for employing in ANG systems.…”

Section: Introductionmentioning

confidence: 99%

ZrBDC-Based Functional Adsorbents for Small-Scale Methane Storage Systems

Соловцова

Меньщиков

Школин

et al. 2022

Adsorption Science & Technology

View full text Add to dashboard Cite

Metal-organic frameworks (MOF), potentially porous coordination structures, are envisioned for adsorption-based natural gas (ANG) storage, including mobile applications. The factors affecting the performance of the ANG system with a zirconium-based MOF with benzene dicarboxylic acid as a linker (ZrBDC) as an adsorbent were considered: textural properties of the adsorbent and thermal effect arising upon adsorption. The high-density ZrBDC-based pellets were prepared by mechanical compaction of the as-synthesized MOF powder at different pressures from 30 to 240 MPa at 298 K without a binder and mixed with polymer binders: polyvinyl alcohol (PVA) and carboxyl methylcellulose (CMC). The structural investigations revealed that the compaction of ZrBDC with PVA under 30 MPa was optimal to produce the ZrBDC-PVA adsorbent with more than a twofold increase in the packing density and the lowest degradation of the porous structure. The specific total and deliverable volumetric methane storage capacities of the ZrBDC-based adsorbents were evaluated from the experimental data on methane adsorption measured up to 10 MPa and within a temperature range from 253 to 333 K. It was measured experimentally that at 253 K, an 100 mL adsorption tank loaded with the ZrBDC-PVA pellets exhibited the deliverable methane storage capacity of 172 m3(NTP)/m3 when the pressure dropped from 10 to 0.1 MPa. The methane adsorption data for the ZrBDC powder and ZrBDC-PVA pellets were used to calculate the important thermodynamic characteristic of the ZrBDC/CH4 adsorption system—the differential molar isosteric heat of adsorption, which was used to evaluate the state thermodynamic functions: entropy, enthalpy, and heat capacity. The initial heats of methane adsorption in powdered ZrBDC evaluated from the experimental adsorption isosteres were found to be ~19.3 kJ/mol, and then these values in the ZrBDC/CH4 system decreased at different rates during adsorption. In contrast, the heat of methane adsorption onto the ZrBDC-PVA pellets increased from 19.4 kJ/mol to a maximum with a magnitude, width, and position depended on temperature, and then it fell. The behaviors of the thermodynamic state functions of the ZrBDC/CH4 adsorption system were interpreted as a variation in the state of adsorbed molecules determined by a ratio of CH4-CH4 and CH4-ZrBDC interactions. The heat of adsorption was used to calculate the temperature changes of the ANG systems loaded with ZrBDC powder and ZrBDC pellets during methane adsorption under adiabatic conditions; the maximum integrated heat of adsorption was found at 273 K. The maximum temperature changes of the ANG system with the ZrBDC materials during the adsorption (charging) process did not exceed 14 K that are much lower than those reported for the systems loaded with activated carbons. The results obtained are of direct relevance for designing the adsorption-based methane storage systems for the automotive industry, developing new gas-power robotics systems and uncrewed aerial vehicles.

show abstract

“…High performance of an adsorbent intended for HEAS requires a “tailored” porous structure [ 3 , 4 , 5 , 7 , 8 , 9 ]. In terms of the Dubinin theory of volume filling of micropores (TVFM) [ 10 ], this means that the efficient adsorbent must possess an optimal micropore half-width or radius x 0 , high micropore volume ( W 0 ), and characteristic energy of adsorption ( E 0 ) [ 11 , 12 ]. Microporous activated carbons (AC) fit into this group of adsorbents due to their chemical, mechanical, and thermal stability and the possibility of tuning their structural and energy characteristics by various activation methods [ 7 , 8 , 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

et al. 2020

View full text Add to dashboard Cite

The present work focused on the experimental study of the performance of a scaled system of adsorbed natural gas (ANG) storage and transportation based on carbon adsorbents. For this purpose, three different samples of activated carbons (AC) were prepared by varying the size of coconut shell char granules and steam activation conditions. The parameters of their porous structure, morphology, and chemical composition were determined from the nitrogen adsorption at 77 K, X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), and scanning electron microscopy (SEM) measurements. The methane adsorption data measured within the temperature range from 178 to 360 K and at pressures up to 25 MPa enabled us to identify the most efficient adsorbent among the studied materials: AC-90S. The differential heats of methane adsorption on AC-90S were determined in order to simulate the gas charge/discharge processes in the ANG system using a mathematical model with consideration for thermal effects. The results of simulating the charge/discharge processes under two different conditions of heat exchange are consistent with the experimentally determined temperature distribution over a scaled ANG storage tank filled with the compacted AC-90S adsorbent and equipped with temperature sensors and heat-exchanger devices. The amounts of methane delivered from the ANG storage system employing AC-90S as an adsorbent differ from the model predictions by 4–6%. Both the experiments and mathematical modeling showed that the thermal regulation of the ANG storage tank ensured the higher rates of charge/discharge processes compared to the thermal insulation.

show abstract

Optimization of structural and energy characteristics of adsorbents for methane storage

Cited by 23 publications

References 42 publications

Adsorption of phosphate by cancrinite in red mud: a first-principles study

Adsorption of phosphate by cancrinite in red mud: a first-principles study

ZrBDC-Based Functional Adsorbents for Small-Scale Methane Storage Systems

Thermodynamic Behaviors of Adsorbed Methane Storage Systems Based on Nanoporous Carbon Adsorbents Prepared from Coconut Shells

Contact Info

Product

Resources

About