Surface properties of photo-oxidized bituminous coals. Quarterly technical report, October 1, 1996--December 31, 1996

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During this reporting period, three vitrain concentrate samples crushed to -200 mesh were irradiated (photo-oxidized) for different time periods (0, 10, 50 and 100 min) using the BLAK-RAY ultraviolet lamp to obtain samples suitable for pyrolysis GC/MS. These samples will be used to investigate whether the levels of photo-oxidation induced with increasing UV irradiation can be detected and measured in bulk vitrains using the technique. The analyses have not been fully completed. Further, additional analysis of reflectance-mode FTIR results obtained from polished blocks of vitrain is currently under way. This evaluation involves calculating the second derivative of the spectra in ... continued below

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11 p.

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Mitchell, G. & Davis, A. February 1, 1997.

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Description

During this reporting period, three vitrain concentrate samples crushed to -200 mesh were irradiated (photo-oxidized) for different time periods (0, 10, 50 and 100 min) using the BLAK-RAY ultraviolet lamp to obtain samples suitable for pyrolysis GC/MS. These samples will be used to investigate whether the levels of photo-oxidation induced with increasing UV irradiation can be detected and measured in bulk vitrains using the technique. The analyses have not been fully completed. Further, additional analysis of reflectance-mode FTIR results obtained from polished blocks of vitrain is currently under way. This evaluation involves calculating the second derivative of the spectra in an attempt to better identify the spectral regions of most significant change resulting from photo-oxidation. These analyses, along with final analytical tests that will destroy the irradiated surfaces, including electron microprobe analysis for near- surface oxygen concentration and x-ray mapping, and measurement of reflectance in oil immersion, are under way and will be completed by the end of February, 1997. During this report period we have begun the preparation of a manuscript tentatively entitled, ``Time Resolved C-NEXAFS Analysis of the Chemistry of Photochemical Alteration of Vitrinite. This publication will discuss our efforts in utilizing Scanning Transmission X-ray Microscopy as a tool to better define the kinetics of photo-oxidation or vitrinite from coals of three different ranks by measuring changes in regions near the carbon-edge absorption.

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11 p.

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OSTI as DE97053074

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  • Other Information: PBD: Feb 1997

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  • Other: DE97053074
  • Report No.: DOE/PC/93223--T9
  • Grant Number: FG22-93PC93223
  • DOI: 10.2172/491832 | External Link
  • Office of Scientific & Technical Information Report Number: 491832
  • Archival Resource Key: ark:/67531/metadc676330

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  • February 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 10, 2015, 9:36 p.m.

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Mitchell, G. & Davis, A. Surface properties of photo-oxidized bituminous coals. Quarterly technical report, October 1, 1996--December 31, 1996, report, February 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc676330/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.