Coal surface structure and thermodynamics. Final report

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Description

Coals surfaces were studied using static surface adsorption measurements, low angle x-ray scattering (LAXS), inverse gas chromatography (IGC) and a new {sup 13}C NMR relaxation technique. A comparison of surface areas determined by hydrocarbon gas adsorption and LAXS led to the twin conclusions that the hydrocarbons had to diffuse through the solid to reach isolated pores and that the coal pores do not form interconnected networks, but are largely isolated. This conclusion was confirmed when IGC data for small hydrocarbons showed no discontinuities in their size dependence as usually observed with porous solids. IGC is capable of providing adsorption thermodynamics ... continued below

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413 p.

Creation Information

Larsen, J.W.; Wernett, P.C.; Glass, A.S.; Quay, D. & Roberts, J. May 1, 1994.

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Description

Coals surfaces were studied using static surface adsorption measurements, low angle x-ray scattering (LAXS), inverse gas chromatography (IGC) and a new {sup 13}C NMR relaxation technique. A comparison of surface areas determined by hydrocarbon gas adsorption and LAXS led to the twin conclusions that the hydrocarbons had to diffuse through the solid to reach isolated pores and that the coal pores do not form interconnected networks, but are largely isolated. This conclusion was confirmed when IGC data for small hydrocarbons showed no discontinuities in their size dependence as usually observed with porous solids. IGC is capable of providing adsorption thermodynamics of gases on coal surfaces. The interactions of non-polar molecules and coal surfaces are directly proportioned to the gas molecular polarizability. For bases, the adsorption enthalpy is equal to the polarizability interaction plus the heat of hydrogen bond formation with phenol. Amphoteric molecules have more complex interactions. Mineral matter can have highly specific effects on surface interactions, but with most of the molecules studied is not an important factor.

Physical Description

413 p.

Notes

OSTI as DE95005301

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  • Other Information: PBD: May 1994

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  • Other: DE95005301
  • Report No.: DOE/PC/89757--T1
  • Grant Number: AC22-89PC89757
  • DOI: 10.2172/49114 | External Link
  • Office of Scientific & Technical Information Report Number: 49114
  • Archival Resource Key: ark:/67531/metadc683346

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1994

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 19, 2015, 3:51 p.m.

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Larsen, J.W.; Wernett, P.C.; Glass, A.S.; Quay, D. & Roberts, J. Coal surface structure and thermodynamics. Final report, report, May 1, 1994; United States. (digital.library.unt.edu/ark:/67531/metadc683346/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.