Cross-polarization nuclear magnetic resonance studies of coals, coal-conversion products, and coal-conversion catalysts. Final technical report

Technical Report · Sat May 01 04:00:00 EDT 1982

OSTI ID:6480550

Maciel, G E

Cross polarization magic-angle spinning /sup 13/C NMR spectra of all of the samples studied are collected in this report. Because of the widely-varying characteristics of the spectra obtained on this project (e.g. different linewidths, aliphatic/aromatic ratios, aromatic chemical shift anisotropies as manifested in spinning sidebands) and because of the progress of research during the period of the project, the spectra were partitioned for analysis in various ways. In preparing this final report, we have standardized the partitioning into two alternate schemes. In one scheme the spectrum is divided arbitrarily into an aliphatic region (95 ppM to -10 ppM) and an aromatic region (the remainder of the spectrum, including spinning sidebands. This partitioning gives the f/sub a/' values (apparent aromatic fraction) reported in the tables. As the only significant sidebands from MAS come from the aromatic resonances, this (and the second) approach should account for the sidebands properly as aromatic intensity. In the second partitioning scheme the spectra are divided into three regions (I, II, III). Region II spans from 105 ppM to 70 ppM, region III from 70 ppM to -10 ppM and Region I is the remainder of the spectrum (aromatic/olefinic resonances, including their spinning sidebands). The expected error ranges given with the f/sub a/' values in the tables of this report are estimates based on experience with numerous similar samples and several replicate determinations. 33 figures, 5 tables.

• Research Organization: Colorado State Univ., Fort Collins (USA). Dept. of Chemistry
• DOE Contract Number: AC22-80PC30008
• OSTI ID: 6480550
• Report Number(s): DOE/PC/30008-T6; ON: DE83005406
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ALKANES
ALKENES
ANGULAR MOMENTUM
AROMATICS
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHEMICAL SHIFT
COAL
DATA
ENERGY SOURCES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
HYDROCARBONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
LINE WIDTHS
MAGNETIC RESONANCE
MATERIALS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
PARTICLE PROPERTIES
POLARIZATION
RESEARCH PROGRAMS
RESONANCE
SPECTRA
SPIN
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS