/sup 13/C CP/MAS NMR study of changes in molecular mobility of coal after pyrolysis at 590 C

Journal Article · · Energy Fuel; (United States)

OSTI ID:6830437

Tekely, P; Nicole, D; Delpuech, J J; Julien, L; Bertho, C

It is generally accepted that the organic part of coal can be considered as being composed of two components. The first component is the macromolecular, insoluble, three-dimensional network composed of condensed aromatic and hydroaromatic units held together by chemical cross-links formed by ether, methylene, or alkyl bridges. The second molecular component includes compounds having relatively low or medium molecular mass (< 1000). The aim of this work was to observe the changes in the amount and mobility of the two components after primary pyrolysis. Measurements of /sup 1/H T*/sub 2/ relaxation times via /sup 13/C CP/MAS NMR signals permit the discrimination between rigid/macromolecular and mobile/molecular components present originally in coal, independently for aromatic and aliphatic protons. Application of this method to the characterization of changes in the amount and mobility of the two components offers a new insight into structural changes at the molecular level and should contribute to a better understanding of conversion processes in coals. 10 references, 2 figures, 1 table.

• Research Organization: Universite de Nancy I, Vandoeuvre-les-Nancy, France
• OSTI ID: 6830437
• Journal Information: Energy Fuel; (United States), Journal Name: Energy Fuel; (United States) Vol. 1:1; ISSN ENFUE
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010409 -- Coal
Lignite
&amp; Peat-- Pyrolysis &amp; Carbonization-- (1987-)
010600* -- Coal
Lignite
&amp; Peat-- Properties &amp; Composition
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
CRYSTAL STRUCTURE
DECOMPOSITION
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MICROSTRUCTURE
MOLECULAR STRUCTURE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
PYROLYSIS
REACTION KINETICS
RELAXATION TIME
RESONANCE
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
THERMOCHEMICAL PROCESSES