Diffusion of gases in coals and chars: Quarterly technical progress report No. 8, June 15, 1987-September 14, 1987
As a result of the complex nature of coal, it is difficult to probe its pore structure over the entire pore size range of interest. Multiple techniques such as gas adsorption (nitrogen and carbon dioxide), mercury porosimetry, small angle x-ray scattering (SAXS) and density measurements are required. These techniques suffer from inherent problems such as a limited pore size range, errors due to network/percolation effects, the necessity of pore shape assumptions, and/or sample changes during analysis. In this work, the use of low-field NMR spin-lattice relaxation measurements as a pore structure analysis technique for coal is demonstrated. In principle, NMR pore structure analysis does not suffer from the problems of the other methods. Other measuring techniques investigated during the report period are: Surface area determination via nitrogen and carbon dioxide adsorption for raw coals; mercury porosimetry; and diffusion measurements.
- Research Organization:
- New Mexico Univ., Albuquerque (USA). Powders and Granular Materials Lab.
- DOE Contract Number:
- FG22-85PC80519
- OSTI ID:
- 5605944
- Report Number(s):
- DOE/PC/80519-8; ON: DE88003399
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diffusion of gases in coals and chars: Technical progress report, quarterly report No. 5, 9/15/86-12/14/86
Diffusion of gases in coals and chars. Technical progress report No. 3, March 15-June 14, 1986
Related Subjects
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ADSORPTION
ALKANES
CARBON
CARBON BLACK
CARBONACEOUS MATERIALS
CHARS
COAL
DIFFUSION
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASEOUS DIFFUSION
HYDROCARBONS
IONIZING RADIATIONS
MAGNETIC RESONANCE
MATERIALS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MEASURING METHODS
METHANE
NITROGEN
NONMETALS
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
POROSIMETERS
POROSITY
POROUS MATERIALS
PROGRESS REPORT
PYROLYSIS PRODUCTS
RADIATIONS
RELAXATION
RESONANCE
SCATTERING
SMALL ANGLE SCATTERING
SORPTION
SPIN-LATTICE RELAXATION
SURFACE AREA
SURFACE PROPERTIES
X RADIATION