Advanced NMR-based techniques for pore structure analysis of coal. Quarterly report No. 3, March 1, 1992--June 30, 1992

Technical Report · Sat Aug 01 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/10163603· OSTI ID:10163603

Smith, D M

One of the main problems in coal utilization is the inability to properly characterize its complex pore structure. Coals typically have micro/ultra-micro pores but they also exhibit meso and macroporosity. We believe that measurement of the NMR parameters of various gas phase and adsorbed phase NMR active probes can provide the resolution to this problem. We will investigate the dependence of the common NMR parameters such as chemical shifts and relaxation times of several different nuclei and compounds on the pore structure of model microporous solids, carbons, and coals. In particular, we will study the interaction between several small molecules ({sup 129}Xe, {sup 3}He, {sup 2}H{sub 2}, {sup 14}N{sub 2}, {sup 14}NH{sub 3}, {sup 15}N{sub 2}, {sup 13}CH{sub 4}, {sup 13}CO{sub 2}) and the pore surfaces in coals. These molecules have been selected for their chemical and physical properties. A special NMR probe will be constructed which will allow the concurrent measurement of NMR properties and adsorption uptake at a variety of temperatures. All samples will be subjected to a suite of ``conventional`` pore structure analyses. These include nitrogen adsorption at 77 K with BET analysis, C0{sub 2} and CH{sub 4} adsorption at 273 K with D-R (Dubinin-Radushkevich) analysis, helium pycnometry, and small angle X-ray scattering as well as gas diffusion measurements. The project combines expertise at the UNM (pore structure, NMR), Los Alamos National Laboratory (NMR), and Air Products (porous materials).

• Research Organization: New Mexico Univ., Albuquerque, NM (United States). Center for Micro-Engineered Ceramics
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91296
• OSTI ID: 10163603
• Report Number(s): DOE/PC/91296--3; ON: DE92018306
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600
665100
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMMONIA
CARBON DIOXIDE
CHEMICAL SHIFT
COAL
DEUTERIUM
HELIUM 3
METHANE
MICROSTRUCTURE
NITROGEN
NUCLEAR MAGNETIC RESONANCE
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
POROSITY
PROGRESS REPORT
PROPERTIES AND COMPOSITION
RELAXATION
SPECTROSCOPY
SURFACE PROPERTIES
XENON 129