Diffusion of gases in coals and chars: Quarterly technical progress report No. 8, June 15, 1987-September 14, 1987

Technical Report · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5605944

Smith, D M

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
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
47 OTHER INSTRUMENTATION
COAL
POROSITY
GASEOUS DIFFUSION
MEASURING METHODS
METHANE
DIFFUSION
NITROGEN
NUCLEAR MAGNETIC RESONANCE
SURFACE AREA
ADSORPTION
CARBON
CARBON BLACK
CHARS
MATHEMATICAL MODELS
POROSIMETERS
POROUS MATERIALS
PROGRESS REPORT
SMALL ANGLE SCATTERING
SPIN-LATTICE RELAXATION
X RADIATION
ALKANES
CARBONACEOUS MATERIALS
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
IONIZING RADIATIONS
MAGNETIC RESONANCE
MATERIALS
MEASURING INSTRUMENTS
NONMETALS
ORGANIC COMPOUNDS
PYROLYSIS PRODUCTS
RADIATIONS
RELAXATION
RESONANCE
SCATTERING
SORPTION
SURFACE PROPERTIES
010300* - Coal
Lignite
& Peat- Preparation- (1987-)
440300 - Miscellaneous Instruments- (-1989)