1985/1986 SOMED (School of Mines and Energy Development) project: A study of catalytic diffusion in coal: Final report

Technical Report · Mon Sep 01 04:00:00 EDT 1986

OSTI ID:6890319

Kispert, L D

A procedure involving nitroxide spin probes of different size has been developed to determine catalyst accessibility and the possible formation of hydrogen bonds in swellable pores of coal after the coal has been subjected to swelling, temperature variation and extraction with acids or bases. Studies have shown that: (1) spin probes can be diffused into untreated high volatile bituminous (HVB) Mary Lee, Black Creek and Illinois No. 5 Coal, but not lignite and medium volatile bituminous Pratt coal unless first extracted with acetic acid or quinoline; (2) small spherical spin probes are well ordered in 5 A diameter pores while; (3) long chain or bulky spin probes undergo librational motion and are hydrogen bonded in larger cavities; (4) it is possible to examine hydrogen-bonding in swellable pores up to 60 A in diameter by use of specially prepared nitroxide spin probes attached to polymers, however it is not possible to study larger size pores as large spin labels are either insoluble in the swelling solvent or pores with diameters of 60 A do not follow a convenient swelling pattern; (5) ENDOR spectra can be observed from spin probes located in HVB coal making it possible to estimate the type of hydrogen bonding in the pores; (6) the pore size and number distribution has been determined for HVB coals as a function of swelling solvent and temperature profile; (7) the trapped spin probes enable an estimate to be made of the presence of hydrogen-bonding in the pores as a function of swelling solvent, acid or base treatment and size of the pore; and (8) the number of hydrogen bonded sites in the swellable pores is usually only 5 to 20% of those found on the surface of the coal. We have determined a number of structural differences between various bituminous coals upon swelling and acid or base treatments which can be used to suggest different optimized catalysts in the hydrogenation of HVB coal.

• Research Organization: Alabama Univ., University (USA). School of Mines and Energy Development
• OSTI ID: 6890319
• Report Number(s): NP-7900480; ON: TI87900480
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ACETIC ACID
ALKYLATED AROMATICS
AROMATICS
AZAARENES
AZINES
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
CATALYSTS
CHEMICAL BONDS
CHEMICAL REACTIONS
COAL
DATA
DIFFUSION
ELEMENTS
ENDOR
ENERGY SOURCES
EXPERIMENTAL DATA
EXTRACTION
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN
HYDROGENATION
INFORMATION
LIGNITE
MAGNETIC RESONANCE
MATERIALS
MONOCARBOXYLIC ACIDS
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PERMEABILITY
POROSITY
PROBES
PYRIDINES
QUINOLINES
RESEARCH PROGRAMS
RESONANCE
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SUBBITUMINOUS COAL
SWELLING
TOLUENE
XYLENES