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Characterization of coals, other kerogens, and their extracts by thermal mass spectrometry

Description: The objective of this study is to elucidate the nature of the medium size molecules derived from coals by a succession of stronger extraction conditions. The Argonne Premium Coals have been extracted with pyridine, binary solvents and with KOH/ethylene glycol at 250{degrees}C. Thermal desorption and pyrolysis mass spectrometry were the major approaches chosen to provide detailed information on structure and heteroatom composition. Soft ionization techniques including desorption chemical ionizat… more
Date: January 1, 1992
Creator: Winans, R. E.; Melnikov, P. E. & McBeth, R. L.
Partner: UNT Libraries Government Documents Department
open access

Characterization of coals, other kerogens, and their extracts by thermal mass spectrometry

Description: The objective of this study is to elucidate the nature of the medium size molecules derived from coals by a succession of stronger extraction conditions. The Argonne Premium Coals have been extracted with pyridine, binary solvents and with KOH/ethylene glycol at 250{degrees}C. Thermal desorption and pyrolysis mass spectrometry were the major approaches chosen to provide detailed information on structure and heteroatom composition. Soft ionization techniques including desorption chemical ionizat… more
Date: April 1, 1992
Creator: Winans, R. E.; Melnikov, P. E. & McBeth, R. L.
Partner: UNT Libraries Government Documents Department
open access

Dissolution of the Argonne Premium Coal Samples in strong base

Description: The objective of this study is to solubilize the Argoruie Premium Coal Samples in order to facilitate analysis by mass spectrometry, FTIR and NMR. Earlier, in a search for relatively mild methods for solubilizing coal, we discovered that treating coals with potassium hydroxide in ethylene glycol at 250{degrees}C to be quite an effective approach. Under these conditions, secondary reactions which may obscure the distribution of the basic building blocks of the coal structure are not expected to … more
Date: March 1, 1993
Creator: Winans, R. E.; McBeth, R. L. & Hunt, J. E.
Partner: UNT Libraries Government Documents Department
open access

Dissolution of the Argonne Premium Coal Samples in strong base

Description: The objective of this study is to solubilize the Argoruie Premium Coal Samples in order to facilitate analysis by mass spectrometry, FTIR and NMR. Earlier, in a search for relatively mild methods for solubilizing coal, we discovered that treating coals with potassium hydroxide in ethylene glycol at 250[degrees]C to be quite an effective approach. Under these conditions, secondary reactions which may obscure the distribution of the basic building blocks of the coal structure are not expected to … more
Date: January 1, 1993
Creator: Winans, R. E.; McBeth, R. L. & Hunt, J. E.
Partner: UNT Libraries Government Documents Department
open access

Structural elucidation of Argonne premium coals: Molecular weights, heteroatom distributions and linkages between clusters

Description: The objective of this study is to create a statistically accurate picture of important structural features for a group of coals representing a broad rank range. Mass spectrometric techniques are used to study coals, coal extracts and chemically modified coals and extracts. Laser desorption mass spectrometry is used to determine molecular weight distributions. Desorption chemical ionization high resolution mass spectrometry provides detailed molecular information on compound classes of molecules… more
Date: December 31, 1995
Creator: Winans, R. E.; Kim, Y.; Hunt, J. E. & McBeth, R. L.
Partner: UNT Libraries Government Documents Department
open access

Variations in organic oxygen structures in the Argonne premium coals as a function of rank

Description: It has been found that MS and NMR results on oxygenated species in coal correlate quite nicely. As expected, from previous studies, structures related to lignin dominate in the lower rank coals. However, benzofurans and dibenzofurans make an important contribution to the overall distribution. Singly and multiply hydroxylated benzene rings are the major oxygen structures in the low rank coals. In addition, carboxylic acids are quite abundant. In the bituminous coals, carboxylic acids are absent … more
Date: September 1, 1993
Creator: Winans, R. E.; McBeth, R. L.; Melnikov, P. E. & Botto, R. E.
Partner: UNT Libraries Government Documents Department
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