Abstract
Adsorption of methane on twelve microporous carbon adsorbents of different origin and structural and energy characteristics was studied at the pressures up to 20 MPa. Specific capacities have been calculated for methane adsorption storage systems. The effectiveness of adsorption accumulation was analyzed in terms of structural and energy characteristics, packing density and thermodynamic parameters of methane adsorption. Differential molar isosteric heats of adsorption and absolute efficiency of adsorption accumulation systems were evaluated. The effects of increased packing density and proper shape of adsorbent material on the adsorption accumulation efficiency were considered. It was shown that a selection of an adsorbent with the most optimal porous structure and density should be adjusted for thermodynamic parameters of accumulation system.
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Notes
(m3(NTP)/m3) is the volume of methane at atmospheric pressure (101,325 Pa) and 293.15 K in 1 m3 of storage system.
Abbreviations
- ANG:
-
Adsorbed natural gas
- CNG:
-
Compressed natural gas
- LNG:
-
Liquefied natural gas
- SC:
-
Silicon carbide raw material
- PM:
-
Polymer raw material
- PT:
-
Peat raw material
- NTP:
-
Normal temperature (293.15 K) and atmosphere pressure (101,325 Pa)
- TVFM:
-
Theory of volume filling of micropores
- VF:
-
Vegetable feed raw material
- A :
-
Differential molar work of adsorption, J/mol
- a :
-
Absolute adsorption, mmol/g
- a 0 :
-
Limiting adsorption at temperature T, mmol/g
- d :
-
Packing density of adsorbent, kg/m3
- d cryst :
-
Crystalline density of adsorbent, kg/m3
- δ g :
-
Density of bulk gas phase of adsorbate at given conditions of temperature and pressure, mmol/cm3
- E :
-
Characteristic energy of adsorption for gas, J/mol
- E 0 :
-
Characteristic adsorption energy of standard benzene vapor, kJ/mol
- E CH4 :
-
Characteristic adsorption energy of methane, kJ/mol
- ε :
-
Fraction of void space (between granules of adsorbent) in ANG system, %
- f :
-
Fugacity of gas, Pa
- f s :
-
Fugacity of saturated gas, Pa
- h g :
-
Molar enthalpy of gas phase, kJ/mol
- H 1 :
-
Differential molar enthalpy of adsorption system, kJ/mol
- M :
-
Molecular mass, g/mol
- m 0 :
-
Mass of regenerated adsorbent, g
- µ :
-
Molar mass of adsorbate, g/mmol
- N :
-
Total amount of gas introduced into a system, mmol
- n :
-
Dimensionless parameter related to the width of the adsorption energy distribution
- R :
-
Universal gas constant, J/(K mol)
- ρ :
-
density of bulk gas phase of adsorbate at standard atmosphere pressure, kg/m3
- ρ ad :
-
Average density of adsorbate, kg/m3
- ρ g (P,T):
-
Density of bulk gas phase of adsorbate at given conditions of temperature and pressure, kg/m3
- ρ L :
-
Density of bulk liquid, kg/m3
- S BET :
-
Specific surface area, or BET surface area, m2/g
- T :
-
Temperature, K
- T 0 :
-
Boiling point, K
- T cr :
-
Critical temperature, K
- P :
-
Pressure, MPa
- p s :
-
Saturated vapor pressure, Pa
- q st :
-
Differential molar isosteric heat of adsorption, kJ/mol
- U :
-
Absolute efficiency of gas adsorption accumulation, m3/m3
- V :
-
Total geometric volume of the adsorption system, cm3
- V sp :
-
Specific capacity of adsorption storage system, m3/m3
- V a :
-
Specific volume of gas in adsorbed state, m3/m3
- V ads :
-
Volume of an adsorbent with micropores, cm3
- V He :
-
Volume of an adsorbent determined via helium pycnometry, cm
- V g :
-
Specific volume of bulk gas phase, m3/m3
- V 0 :
-
Volume of regenerated adsorbent, cm3/g
- W 0 :
-
Micropore volume, cm3/g
- x 0 :
-
Average effective half-width of micropores, nm
- Z :
-
Compressibility factor of the equilibrium gas phase at pressure P and temperature T
- ν g :
-
Specific gas phase volume, cm3/g
- v 0 :
-
Specific reduced volume of the “adsorbent-adsorbate” system, cm3/g
- a:
-
Adsorbed
- ads:
-
Adsorbent
- cr:
-
Critical
- cryst:
-
Crystalline
- g:
-
Gas phase
- L:
-
Liquid
- s:
-
Saturated
- st:
-
Isosteric
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Acknowledgements
The work was supported by the Russian Ministry of Education and Science in the framework of the Federal Target Program “Research and development on priority directions of scientific and technological complex of Russia for 2014–2020”. Agreement No. 14.607.21.0079, unique project identifier: RFMEFI60714X0079.
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Men’shchikov, I.E., Fomkin, A.A., Tsivadze, A.Y. et al. Adsorption accumulation of natural gas based on microporous carbon adsorbents of different origin. Adsorption 23, 327–339 (2017). https://doi.org/10.1007/s10450-016-9854-1
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DOI: https://doi.org/10.1007/s10450-016-9854-1