Impact of organic-mineral matter interactions on thermal reaction pathways for coal model compounds

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Coal is a complex, heterogeneous solid that includes interdispersed mineral matter. However, knowledge of organic-mineral matter interactions is embryonic, and the impact of these interactions on coal pyrolysis and liquefaction is incomplete. Clay minerals, for example, are known to be effective catalysts for organic reactions. Furthermore, clays such as montmorillonite have been proposed to be key catalysts in the thermal alteration of lignin into vitrinite during the coalification process. Recent studies by Hatcher and coworkers on the evolution of coalified woods using microscopy and NMR have led them to propose selective, acid-catalyzed, solid state reaction chemistry to account for retained ... continued below

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5 p.

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Buchanan, A.C. III; Britt, P.F. & Struss, J.A. July 1, 1995.

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Coal is a complex, heterogeneous solid that includes interdispersed mineral matter. However, knowledge of organic-mineral matter interactions is embryonic, and the impact of these interactions on coal pyrolysis and liquefaction is incomplete. Clay minerals, for example, are known to be effective catalysts for organic reactions. Furthermore, clays such as montmorillonite have been proposed to be key catalysts in the thermal alteration of lignin into vitrinite during the coalification process. Recent studies by Hatcher and coworkers on the evolution of coalified woods using microscopy and NMR have led them to propose selective, acid-catalyzed, solid state reaction chemistry to account for retained structural integrity in the wood. However, the chemical feasibility of such reactions in relevant solids is difficult to demonstrate. The authors have begun a model compound study to gain a better molecular level understanding of the effects in the solid state of organic-mineral matter interactions relevant to both coal formation and processing. To satisfy the need for model compounds that remain nonvolatile solids at temperatures ranging to 450 C, model compounds are employed that are chemically bound to the surface of a fumed silica (Si-O-C{sub aryl}linkage). The organic structures currently under investigation are phenethyl phenyl ether (C{sub 6}H{sub 5}CH{sub 2}CH{sub 2}OC{sub 6}H{sub 5}) derivatives, which serve as models for {beta}-alkyl aryl ether units that are present in lignin and lignitic coals. The solid-state chemistry of these materials at 200--450 C in the presence of interdispersed acid catalysts such as small particle size silica-aluminas and montmorillonite clay will be reported. Initial focus will be on defining the potential impact of these interactions on coal pyrolysis and liquefaction.

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5 p.

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OSTI as DE95014282

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  • 210. national meeting of the American Chemical Society (ACS), Chicago, IL (United States), 20-25 Aug 1995

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  • Other: DE95014282
  • Report No.: CONF-950801--4
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 86959
  • Archival Resource Key: ark:/67531/metadc792493

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  • July 1, 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 19, 2016, 3:42 p.m.

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Buchanan, A.C. III; Britt, P.F. & Struss, J.A. Impact of organic-mineral matter interactions on thermal reaction pathways for coal model compounds, article, July 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc792493/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.