Diffusion of gases in coals and chars. Quarterly technical progress report No. 4, June 15-September 14, 1986
Surface areas of 13 PSOC coals have been measured by nitrogen adsorption at 77 K and carbon dioxide adsorption at 273 K. The 13 PSOC coals studied include the 8 coals of group A as well as 5 additional coals from Group B for which we had suitable sample quantity. As discussed in previous reports, nitrogen at 77 K will not penetrate micropores and is therefore, a measure of the pore surface area for pores greater than or about 2 nm. The exact size of the pore size cut-off for which nitrogen cannot enter is not precisely known and is presumedly a function of coal chemistry, particle size and equilibration time. Surface areas calculated from nitrogen adsorption reported in a previous quarterly report were for a particle size of <325 mesh. This quarter, we have repeated the nitrogen adsorption experiments for a narrower particle size range, 325 to 400 mesh, for the eight Group A coals. Surface areas were extracted from nitrogen adsorption isotherms using the BET theory. Mercury intrusion experiments were conducted on narrow cut samples (325 to 400 mesh) of all eight Group A coals using an Autoscan-33 scanning mercury porosimeter. NMR pore structure analysis was also undertaken during this quarter by taking spin-lattice relaxation measurements of water contained in the pore space of 13 PSOC coals.
- Research Organization:
- New Mexico Univ., Albuquerque (USA). Dept. of Chemical and Nuclear Engineering
- DOE Contract Number:
- FG22-85PC80519
- OSTI ID:
- 5189488
- Report Number(s):
- DOE/PC/80519-4; ON: DE87000822
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diffusion of gases in coals and chars. Technical progress report No. 2, December 15, 1985-March 14, 1986
Diffusion of gases in coals and chars. Technical progress report: quarterly report No. 1, September 15-December 14, 1985
Related Subjects
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ADSORPTION
ADSORPTION ISOTHERMS
CALCULATION METHODS
CARBONACEOUS MATERIALS
COAL
CRYSTAL STRUCTURE
DATA
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
INFORMATION
ISOTHERMS
LOW TEMPERATURE
MATERIALS
MEASURING INSTRUMENTS
MICROSTRUCTURE
NITROGEN
NONMETALS
NUMERICAL DATA
PARTICLE SIZE
POROSIMETERS
POROSITY
RESEARCH PROGRAMS
SIZE
SORPTION
SORPTIVE PROPERTIES
SURFACE AREA
SURFACE PROPERTIES