Title of article
Determination of Algerian Hassi-Messaoud asphaltene aromaticity with different solid-state NMR sequences
Author/Authors
Bouhadda، نويسنده , , Y. and Florian، نويسنده , , P. and Bendedouch، نويسنده , , D. and Fergoug، نويسنده , , T. and Bormann، نويسنده , , D.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2010
Pages
5
From page
522
To page
526
Abstract
Algerian oil well deposit derived asphaltene fraction was characterized by different MAS/NMR sequences to investigate asphaltene aromaticity and the best cross-polarization contact time. The aromaticity was estimated by single pulse sequence (SP), Hahn-echo (HE), cross-polarization (CP) and variable cross-polarization (VACP) sequences. The values found ranging from 0.58 to 0.48 are of the same order of magnitude as ones published in the literature. The discrepancies between the values are thought to be relevant to both the specificity of each sequence and the asphaltene structure. Spectra band de-convolution enables us the determination of the average number of carbon atoms per side chain according to each sequence. The obtained values spanning from 3 to 7 are also sequence nature dependent.
Keywords
CP/MAS/NMR , VACP/MAS/NMR , Aromaticity , asphaltene , SP/MAS/NMR
Journal title
Fuel
Serial Year
2010
Journal title
Fuel
Record number
1465430
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