Determination of the Average Aromatic Cluster Size of Fossil Fuels by Solid-State NMR at High Magnetic Field

Journal Article · Mon Jan 07 00:00:00 EST 2013 · Energy & Fuels

DOI:https://doi.org/10.1021/ef301804p· OSTI ID:1082462

Mao, Kanmi ^[1]; Kennedy, Gordon J. ^[1]; Althaus, Stacey M. ^[2]; Pruski, Marek ^[2]

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1. ExxonMobile Research and Engineering Co.
2. Ames Laboratory

We show that the average aromatic cluster size in complex carbonaceous materials can be accurately determined using fast magic-angle spinning (MAS) NMR at a high magnetic field. To accurately quantify the nonprotonated aromatic carbon, we edited the 13C spectra using the recently reported MAS-synchronized spin–echo, which alleviated the problem of rotational recoupling of 1H-13C dipolar interactions associated with traditional dipolar dephasing experiments. The dependability of this approach was demonstrated on selected Argonne Premium coal standards, for which full sets of basic structural parameters were determined with high accuracy.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1082462
• Report Number(s): IS-J 7945
• Journal Information: Energy & Fuels, Vol. 27, Issue 2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Fossil Fuels, Derivatives, and Related Products