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International Journal of Global WarmingVolume 9, Issue 4, 2016, Pages 467-485

Coal gas adsorption/desorption isotherms versus diffusion process(Article)

  • aCIAGEB, Global Change, Energy, Faculty of Science and Technology, Environment and Bioengineering RDID and D Unit, Universidade Fernando Pessoa, Praça de 9 de Abril, 349, Porto, 4249-004, Portugal
  • bAcademia das Ciências de Lisboa, Rua da Academia das Ciências, 19, Lisboa, 1249-122, Portugal

Abstract

In the present work, the authors studied two meta-Anthracite samples from Douro coalfield (NW of Portugal) in which classical sorption isotherms were carried out, using CO2 only. Results have demonstrated that whenever the CO2 is adsorbed in the coal pores/matrix it will be enduringly fixed up to, approximately, pressures of 32 bar in sample A and 34 bar in sample B. Since the gas release process is intensely related to diffusion coefficients, it is crucial to define their evolution on the two analyses reported in this paper. So, during adsorption, diffusion coefficients decrease in sample A from 4.66736E-08 to 1.23490E-09 cm2/sec (6.72 and 48.13 bar) and during desorption they increase from 7.61829E-09 to 1.09908E-08 cm2/sec (45.68 and 11.48 bar). In sample B, diffusion coefficients decrease from 2.47409E-08 to 2.11813E-09 cm2/sec (7.53 and 47.17 bar) in adsorption and increase in desorption from 1.48767E-09 to 2.83736E-08 cm2/sec (42.22 and 7.71 bar). © 2016 Inderscience Enterprises Ltd.

Author keywords

Adsorption/desorptionCO2CoalDiffusion processGlobal warmingSorption isotherms
  • ISSN: 17582083
  • Source Type: Journal
  • Original language: English
  • DOI: 10.1504/IJGW.2016.076332
  • Document Type: Article
  • Publisher: Inderscience Publishers

  Dinis, M.A.P.; CIAGEB, Global Change, Energy, Faculty of Science and Technology, Environment and Bioengineering RDID and D Unit, Universidade Fernando Pessoa, Praça de 9 de Abril, 349, Porto, Portugal;
© Copyright 2018 Elsevier B.V., All rights reserved.

Cited by 2 documents

Rodrigues, C.F.A. , Da Silva, J.M.M. , Dinis, M.A.P.
Effect of gas compressibility factor estimation in coal sorption isotherms accuracy
(2018) International Journal of Oil, Gas and Coal Technology
Rodrigues, C.F.A. , Dinis, M.A.P. , Lemos De Sousa, M.J.
Gas content derivative data versus diffusion coefficient
(2016) Energy Exploration and Exploitation
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