Characterization of coal chars from a flash pyrolysis process by cross polarization / magic angle spinning /sup 13/C NMR

Conference · Sat Jan 01 04:00:00 EST 1983 · Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:6877602

Chou, M I.M.; Dickerson, D R; Frye, J F; McKay, D R

In the last two decades, flash pyrolysis has been used to investigate the structure of coal and shale. Several coal conversion processes based on flash pyrolysis are under investigation in the United States, West Germany, and Australia. Studies of the molecular properties of the flash pyrolysis products have been confined to the liberated organic matter: volatile liquids and gases. Changes occurring in the organic structure of the chars are poorly understood. The development of /sup 13/C cross polarization (CP) and Magic Angle Spinning (MAS) Nuclear Magnetic Resonance (NMR) spectroscopy with high-power proton decoupling has allowed investigators to obtain spectra of the organic matter in solid coal. Sullivan and Maciel and Dudley and Fyfe have verified the quantitative reliability of this technique as applied to coal. /sup 13/C NMR spectra of coal demonstrating the utility of both CP and MAS have been reported previously, however, there has been no reported investigation of /sup 13/C CP/MAS NMR spectra of the chars produced by flash pyrolysis. This paper reports the results of this technique applied to the study of chars produced by the flash pyrolysis of coal at progressively higher temperatures. The investigation has given valuable insight into the changes of organic composition of coal during carbonization as well as the optimum temperature for efficient conversion of coal into liquids and gases.

• Research Organization: Illinois State Geological Survey, Champaign, IL
• OSTI ID: 6877602
• Report Number(s): CONF-830814-
• Conference Information: Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 28:5
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CARBONIZATION
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
DECOMPOSITION
ENERGY SOURCES
EVEN-ODD NUCLEI
FLASH HEATING
FOSSIL FUELS
FUELS
HEATING
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MEASURING INSTRUMENTS
MOLECULAR STRUCTURE
NMR SPECTROMETERS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OPTIMIZATION
ORIENTATION
PYROLYSIS
PYROLYSIS PRODUCTS
REACTION KINETICS
RESONANCE
SPECTRA
SPECTROMETERS
SPIN ORIENTATION
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES