Investigation of the Deswelling Characteristics of Illinois No. 6 Coal by Nuclear Magnetic Resonance Imaging (NMRI) and NMR Techniques
Investigation of the Deswelling Characteristics of Illinois No. 6 Coal by Nuclear Magnetic Resonance Imaging (NMRI) and NMR Techniques

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Published: 1993

Total Pages: 4

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NMRI can observe the internal and external physical structural changes of a sample as well as the solvent penetration process without physical handing. Although the spatial resolution achievable in NMRI of coal samples is only 20--40 [mu]m swelling of coal can be measured because a polar solvent expands the coal to almost twice its original volume. NMR can also monitor the change of solvent concentration m a swollen coal (by integrating the peak areas of the NMR spectra), and can also examine solvent mobility (by measuring spin-lattice and spin-spin relaxation times). This paper reports results on application of NMR and NMRI for study of solvent induced-deswelling in an Illinois No. 6 coal.

NMR Imaging
NMR Imaging

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Published: 1991

Total Pages: 7

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This paper presents a new three-dimensional (3-D) nuclear magnetic resonance (NMR) imaging technique for spatially mapping proton distributions in whole coals and solvent-swollen coal samples. The technique is based on a 3-D back-projection protocol for data acquisition, and a reconstruction technique based on 3-D Radon transform inversion. In principle, the 3-D methodology provides higher spatial resolution of solid materials than is possible with conventional slice-selection protocols. The applicability of 3-D NMR imaging has been demonstrated by mapping the maceral phases in Utah Blind Canyon (APCS {number sign}6) coal and the distribution of mobile phases in Utah coal swollen with deuterated and protic pyridine. 7 refs., 5 figs.

NMR Spectroscopy and Imaging of Macerals in Argonne Premium Coals
NMR Spectroscopy and Imaging of Macerals in Argonne Premium Coals

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Published: 1990

Total Pages: 9

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Macerals that have been separated from two high-volatile bituminous coals from the Argonne Premium Coal Sample Program are surveyed using chemical and NMR spectroscopic techniques. Quantitative aspects of the method are discussed. Alkylation using 13C enriched methyl iodide followed by solid 13C NMR analysis was used to determine the concentrations of acidic OH and CH sites in these macerals. Also, the first successful application of nuclear magnetic resonance imaging (MRI) for spatially mapping chemically distinct regions within a Utah coal has been demonstrated. 15 refs., 5 figs., 2 tabs.