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Monolithic microporous carbon adsorbent for low-temperature natural gas storage

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Abstract

The present study is aimed at the development of scientific and technological approaches to the production and exploitation of adsorption systems for natural gas storage at low temperatures. In this work, a monolithic microporous carbon adsorbent is proposed for the accumulation of natural gas; the comprehensive investigations of its structure and properties were carried out. The proposed adsorbent was used for filling up a mobile adsorption natural gas storage reservoir (an adsorber) equipped with the internal and external heat exchangers which provided different modes of fueling/delivery process. The adsorber endured the integrated reliability testing under isothermal, adiabatic and low-temperature conditions of gas fueling/delivery modes. The adsorption characteristics were determined at the pressures up to 10 MPa and within the temperature range from 238 to 293 K; the energy consumptions upon the processes of gas fueling and adsorber cooling were accessed depending on the fueling mode; the temperature variations occurring in the adsorber upon the gas fueling/delivery processes were studied within the pressure range from 0.05 to 10 MPa. Cyclic testings of the mobile adsorber of natural gas were performed to determine an influence of the cyclic loading on the adsorption capacity of the adsorbent.

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Notes

  1. According to NIST, the normal conditions for gas volume determination (NTP) are T=293.15 K, P=101,325 Pa.

Abbreviations

a :

Absolute adsorption, mmol/g

E :

Characteristic energy of adsorption for gas, J/mol

E 0 :

Characteristic adsorption energy of standard benzene vapor, kJ/mol

M :

Mass of adsorbed methane, g

P :

Pressure, MPa

S BET :

Specific surface area, or BET surface area, m2/g

T :

Temperature, K

t :

Time of methane adsorption/desorption, s

τ :

Time of fueling/delivery of the adsorber, h

q st :

Differential molar isosteric heat of adsorption, kJ/mol

2θ:

Angle between a reflected X-ray beam and the incident X-ray beam, degrees

V a :

Specific volume of accumulated methane, m3/m3

W 0 :

Micropore volume, cm3/g

X 0 :

Average effective half-width of micropores, nm

a:

Adsorbed

st:

Isosteric

ANG:

Adsorbed natural gas

CNG:

Compressed natural gas

LNG:

Liquefied natural gas

MANG:

Mobile adsorber of natural gas

NLDFT:

Non localized density functional theory

NTP:

Normal temperature (293.15 K) and atmosphere pressure (101,325 Pa)

SEM:

Scanning Electron Microscopy

XRD:

X-ray diffraction

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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 a scientific and technological complex of Russia for 2014–2020”. Agreement No. 14.607.21.0079, project identifier: RFMEFI60714X0079.

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Correspondence to A. V. Shkolin.

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Shkolin, A.V., Fomkin, A.A., Men’shchikov, I.E. et al. Monolithic microporous carbon adsorbent for low-temperature natural gas storage. Adsorption 25, 1559–1573 (2019). https://doi.org/10.1007/s10450-019-00135-0

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  • DOI: https://doi.org/10.1007/s10450-019-00135-0

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