Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Cross polarization/magic angle spinning /sup 13/C NMR

Journal Article · · Liq. Fuels Technol.; (United States)
; ; ;

Chars from the Illinois Springfield (No. 5) Coal are prepared by flash pyrolysis at progressively higher charring temperatures. Results of a study indicate that the initial stage of heating produces a char with aromatic carbon fraction (f /sub ar/ ) of 68%, and successive heating gives chars with f /sub ar/ ) of 70% (400/sup 0/C), 73% (500/sup 0/C), 89% (600/sup 0/C), 95% (700/sup 0/C), and 96% (800/sup 0/C). The actual aromatic and aliphatic carbon can be calculated by using the NMR measurements, the organic carbon content and weight of the char. Calculated values show that the amount of aromatic carbon in char remains relatively constant at each temperature, but the amount of aliphatic carbon in char is reduced during higher temperature charring. At 600/sup 0/C, both a large reduction of the aliphatic carbon content and a maximum weight loss occur. Evidently, the aliphatic-bond carbon in coal is the principal source of volatiles derived from coal. The apparent increase in aromaticity (f /sub ar/ ) of the char heated to progressively higher temperatures is due to the loss of aliphatic-bond moieties and reduction in volume of materials.

Research Organization:
Illinois State Geological Survey, Champaign, IL
OSTI ID:
5289699
Journal Information:
Liq. Fuels Technol.; (United States), Journal Name: Liq. Fuels Technol.; (United States) Vol. 2:4; ISSN LFTED
Country of Publication:
United States
Language:
English

Similar Records

Solid-State NMR Investigation of Bio-chars Produced from Biomass Components and Whole Biomasses
Journal Article · Thu Aug 24 00:00:00 EDT 2017 · BioEnergy Research · OSTI ID:1394610
Application of the {sup 13}C NMR magic angle turning experiment to coal studies
Journal Article · Sat Dec 30 23:00:00 EST 1995 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry · OSTI ID:422062
Carbon-13 NMR studies of coals by cross polarization and magic-angle spinning
Conference · Sun Dec 31 23:00:00 EST 1978 · Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) · OSTI ID:5954874

Related Subjects

01 COAL, LIGNITE, AND PEAT
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
AROMATICS
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHARS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COAL LIQUEFACTION
DECOMPOSITION
ENERGY SOURCES
EVEN-ODD NUCLEI
FLASH HEATING
FLASH HYDROPYROLYSIS PROCESS
FOSSIL FUELS
FUELS
GASIFICATION
HEATING
HIGH TEMPERATURE
ISOTOPES
LIGHT NUCLEI
LIQUEFACTION
MAGNETIC RESONANCE
MATERIALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORGANIC COMPOUNDS
POLARIZATION
PRODUCTION
PYROLYSIS
PYROLYSIS PRODUCTS
RESONANCE
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES