Porosity of coal and shale: Insights from gas adsorption and SANS/USANS techniques

Maria Mastalerz, Lilin He, Yuri B. Melnichenko, John A. Rupp

Research output: Contribution to journalArticlepeer-review

469 Scopus citations

Abstract

Two Pennsylvanian coal samples (Spr326 and Spr879-IN1) and two Upper Devonian-Mississippian shale samples (MM1 and MM3) from the Illinois Basin were studied with regard to their porosity and pore accessibility. Shale samples are early mature stage as indicated by vitrinite reflectance (R o) values of 0.55% for MM1 and 0.62% for MM3. The coal samples studied are of comparable maturity to the shale samples, having vitrinite reflectance of 0.52% (Spr326) and 0.62% (Spr879-IN1). Gas (N 2 and CO 2) adsorption and small-angle and ultrasmall-angle neutron scattering techniques (SANS/USANS) were used to understand differences in the porosity characteristics of the samples. The results demonstrate that there is a major difference in mesopore (2-50 nm) size distribution between the coal and shale samples, while there was a close similarity in micropore (<2 nm) size distribution. Micropore and mesopore volumes correlate with organic matter content in the samples. Accessibility of pores in coal is pore-size specific and can vary significantly between coal samples; also, higher accessibility corresponds to higher adsorption capacity. Accessibility of pores in shale samples is low.

Original languageEnglish
Pages (from-to)5109-5120
Number of pages12
JournalEnergy and Fuels
Volume26
Issue number8
DOIs
StatePublished - Aug 16 2012

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