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Coal precursors for carbon molecular seives. Quarterly progress report, July 1, 1995--September 30, 1995

Description: Shortly after our Quarterly Report for the period April 1, 1995 - June 30, 1995 was submitted, we completed the last two thermogravimetric-mass spectrographic (TG/MS) analyses of our samples. The results of these analyses will be included in the Final Report with the TG/MS data accumulated for the other coal samples. We then turned our attention to activating each of the coals using air activation. The results of the activation study are reported below.
Date: September 29, 1995
Creator: Kopp, O.C.
Partner: UNT Libraries Government Documents Department

Combined thermogravimetric and mass spectroscopic analysis (TG/MS). Quarterly report, April 1, 1995--June 30, 1995

Description: Progress is reported on the analysis of coals using thermogravimetric (TG) and mass spectrographic (MS) analysis and adding information to the database. Samples were analyzed using oxidative pyrolysis. Various types (coal rank) of coal were utilized.
Date: September 1, 1995
Creator: Kopp, O. C.
Partner: UNT Libraries Government Documents Department

Mineral sources of water in evaporite sequences (salado salt and adjacent beds at the proposed waste disposal facility near Carlsbad in Lea and Eddy Counties, New Mexico)

Description: Results of this study indicates that the Salado Salt is composed primarily of fine to coarse-grained halite with polyhalite, anhydrite, and clay minerals. Other minerals detected in small amounts include gypsum, magnesite, quartz, feldspar, sylvite, carnallite, celestite(question), glauconite, and kainite(question). Petrographic evidence (hopper crystals, and intergrowth of halite with other minerals) indicate that the Salado Salt was deposited in rather shallow water and may have been exposed subaerially at times. There must have been a major change in environmental conditions between the deposition of the Castile Formation and that of the Salado. The evidence also suggests that fluids have been able to move through the Salado Salt along beds and seams of clay and silt and somewhat along fractures. Water loss upon heating to 102 +- 5/sup 0/C ranges from 0.0 to 3.5 percent, considerably lower than those for Lyons, Kansas samples. Most of the dehydration water at 100/sup 0/C comes from clay minerals, while at higher temperatures, polyhalite contributes. The rock units in Salado Salt seem to release much less water when dehydrated than the Hutchinson Salt rocks at Lyons. During preparation of some of the samples, H/sub 2/S and possibly some natural gas were released when the samples were crushed. (DLC)
Date: September 1, 1975
Creator: Kopp, O. C. & Combs, D. W.
Partner: UNT Libraries Government Documents Department

Application of scanning electron microscopy and ultraviolet fluorescence to a study of Chattanooga Shale

Description: Microanalytical techniques such as scanning electron microscopy, energy-dispersive x-ray analysis, and electron-beam microprobe analysis have been shown to be ideal for determining the host phases of the minor and trace elements in the Chattanooga shale. Positive correlations were found between pyrite and organic constituents. However, these observations provided no evidence that microorganisms acted as hosts for pyrite framboids. Interestingly, appreciable organic sulfur is still present, suggesting that the sulfur used for the formation of pyrite must have been derived mostly from other sources. It may be that the sulfate-reducing bacteria had an affinity for organic matter and that the organic fragments acted as substrates for pyrite growth.
Date: January 1, 1982
Creator: Harris, L.A.; Kopp, O.C. & Crouse, R.S.
Partner: UNT Libraries Government Documents Department

Coal precursors for carbon molecular sieves. Quarterly report, October 1, 1995--December 31, 1995

Description: We have completed the remainder of our experimental work during this work period and have extracted much of the data from the many analyses performed. The temperatures at which selected thermal reactions occur and the temperatures at which monitored gases are released are in the process of being read from the computerized data. The data gleaned from the literature and the data we have gathered will be combined and examined using multiple regression analysis. During the course of our study we performed 55 BET analyses (including 12 fresh coal analyses, 10 coal samples that had been pyrolyzed in helium gas, 24 coal samples that had been activated using He-O2, 5 coal samples activated using He-H2O, and 4 coals samples activated using CO2). The number of BET analyses performed far exceeds the number we had planned when this project was first proposed. These analyses provide information that reveals the effects that factors such as the gas (or gas mixture) used for activation, the maximum temperature reached during activation, grain size, etc., have on the degree to which a coal is activated. These relationships are described, briefly, below. They will be discussed in detail in the Final Report. During this work period the FTIR equipment became available and we completed the FTIR analyses of all twelve (12) coal samples.
Date: December 29, 1995
Creator: Kopp, O.C.; Sparks, C.R. & Fuller, E.L. Jr.
Partner: UNT Libraries Government Documents Department

Coal precursors for carbon molecular sieves (CMS): Appendices A through L. Final report, October 1, 1994--March 31, 1996

Description: The data for each coal sample used in this study are included in a separate appendix. The information for each coal is presented in the following order: coal sample data (literature); coal sample data (measured); thermogravimetric data; mass spectroscopy data; mercury intrusion pore analysis; quantachrome gas sorption analysis (BET) using nitrogen (raw whole coal sample); quantachrome gas sorption analysis (BET) using nitrogen (activated whole coal sample; and plot of FTIR (DRIS) information absorbance vs wavenumbers).
Date: March 31, 1996
Creator: Kopp, O.C.; Sparks, C.R.; McKinney, M.L.; Fuller, E.L. Jr. & Rogers, M.R.
Partner: UNT Libraries Government Documents Department