Solid state NMR methods for coal science. Progress report, July 1, 1983-September 31, 1984

Technical Report · Sat Dec 01 04:00:00 EST 1984

OSTI ID:6207127

Zilm, K W

This report covers the progress made on the title project during the last quarter. While a good deal of our time has been spent setting up our new NMR laboratory, we have made several significant advances in solid state NMR technique development that will have important applications in structure determination of coal, coal products and other fossil fuels. We have developed a CP/MAS probe that is routinely capable of producing decoupling fields in excess of 100 KHz without excessive power consumption and that has a very homogeneous radio frequency field. This piece of equipment has proven crucial to the success of a number of new techniques we are developing. In addition to increasing our sensitivity, the intensity, and homogeneity of the R.F. field, this probe now makes a number of multiple pulse techniques feasible. One avenue that has been pursued this quarter is understanding how to better decouple and thus increase the resolution of /sup 13/C CP/MAS spectra. It has been found that improved decoupling does lead to an increase in resolution in coal C-13 CP-MAS spectra. Preliminary results indicate it is now possible to resolve four bands in the aliphatic region and to substantially narrow CH/sub 2/ resonances in whole coals. 4 figures.

• Research Organization: Yale Univ., New Haven, CT (USA). Dept. of Chemistry
• DOE Contract Number: FG22-83PC60791
• OSTI ID: 6207127
• Report Number(s): DOE/PC/60791-4; ON: DE85005840
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
COAL
DATA
ENERGY SOURCES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATERIALS
NMR SPECTRA
NUCLEI
NUMERICAL DATA
PROBES
PULSE TECHNIQUES
RESEARCH PROGRAMS
SPECTRA
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS