Sorption-desorption kinetics for powdered and non-powered coal

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Diffusion through macro- and meso-pores with the subsequent filling of open micropores is a relatively fast process and the manometric measurements with fifteen minute pressure stabilization steps provide a good estimate of excess (ad)sorption. This can be followed by a much slower processes of the penetrant diffusion into the macromolecular network, accompanied by its structural relaxation, with or without free volume changes. The “free volume” effect is a change of the sample’s excluded volume because of the penetrant molecules mixing within the formerly excluded volume of the network or because of contraction (either reversible or semi-permanent) due to external pressure. ... continued below

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Romanov, V. & Soong, Y. May 1, 2007.

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Diffusion through macro- and meso-pores with the subsequent filling of open micropores is a relatively fast process and the manometric measurements with fifteen minute pressure stabilization steps provide a good estimate of excess (ad)sorption. This can be followed by a much slower processes of the penetrant diffusion into the macromolecular network, accompanied by its structural relaxation, with or without free volume changes. The “free volume” effect is a change of the sample’s excluded volume because of the penetrant molecules mixing within the formerly excluded volume of the network or because of contraction (either reversible or semi-permanent) due to external pressure. If the resulting swelling of the sample leads to the mixture’s volume equal to the sum of the initial volumes of the components, there is no apparent change to the void volume and no pressure relaxation is observed (b). On the other hand, if the external forces (either macroscopic pressure or microscopic molecular interaction forces) change the excluded volume of the network (its density), without exchange of the sorbent molecules between the sample and the free fluid phase, such change causes a corresponding change in the void volume, which constitutes a pure free volume effect (c). In this case, no post-decompression exodus of the sorbent out of the sample is observed. As a special case, we consider an incorporation of the penetrant molecules into the network without any change in the volume of the mixture (d), though mathematically this can be written as a superposition of the previous two cases

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  • Sixth Annual Conference on Carbon Capture & Sequestration, Pittsburgh, PA, May 7-10, 2007; Related Information: Poster is only publication.

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  • Report No.: DOE/NETL-IR-2007-141
  • Grant Number: None cited
  • Office of Scientific & Technical Information Report Number: 915426
  • Archival Resource Key: ark:/67531/metadc885386

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

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  • May 1, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 4, 2016, 2:04 p.m.

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Romanov, V. & Soong, Y. Sorption-desorption kinetics for powdered and non-powered coal, article, May 1, 2007; (digital.library.unt.edu/ark:/67531/metadc885386/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.