Molecular accessibility in oxidized and dried coals. Quarterly report Page: 2 of 7
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
2
INTRODUCTION
The objective of this research project is to determine the molecular and
structural changes that occur in swelled coal as a result of oxidation and moisture
loss both in the presence and absence of light using our newly developed EPR spin
probe method. The proposed study will make it possible to deduce the molecular
accessibility distribution in swelled, oxidized APCS coal for each rank as a function
of (1) size (up to 6 nm) and shape, (2) the relative acidic/basic reactive site
distributions, and (3) the role of hydrogen bonding as a function of swelling
solvents. The advantage of the EPR method is that it permits molecules of selected
shape, size and chemical reactivity to be used as probes of molecular accessible
regions of swelled coal. From such data an optimum catalyst can be designed to
convert oxidized coal into a more convenient form and methods can be devised to
lessen the detrimental weathering processes.
PREVIOUS WORK
Long-Term Weathering of APCS coal
A detailed study of long term weathering of 8 APCS coals using spin probe VII
in toluene has been carried out.1 The intercalation of potential catalysts in APCS
coal Illinois #6 during the swelling process in binary solvent mixtures2 was studied
using spin probes with various functionalities as model guest compounds. An
invited paper on the current status of spectroscopic techniques used to study the
porous structure of coal has been presented.3 Results of long term weathering for
periods up to six months of exposure to air have been analyzed for spin probes VI (3-
carboxy-2,2,5,5-tetramethylpiperidine-1-oxyl) and VIII (TEMPO).3
Binary Swelling Results
Binary swelling data has been collected for all Argonne Premium Coal
Samples (APCS). It appears from preliminary analysis that as the rank of the coal
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Kispert, L. D. Molecular accessibility in oxidized and dried coals. Quarterly report, report, December 1, 1995; Tuscaloosa, Alabama. (https://digital.library.unt.edu/ark:/67531/metadc665791/m1/2/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.