- Title
- Structural elucidation of humic acids extracted from Pakistani lignite using spectroscopic and thermal degradative techniques
- Creator
- Nasir, Saqib; Sarfaraz, Tahira; Verheyen, Vincent; Chaffee, Alan
- Date
- 2011
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/169047
- Identifier
- vital:13951
- Identifier
-
https://doi.org/10.1016/j.fuproc.2010.12.020
- Identifier
- ISBN:0378-3820
- Abstract
- The present paper describes the characterization of Pakistan lignite coal, derived humic acids (HAL) and nitrohumic acids (NHA) along with the standard leonardite humic acids (LHA). The study utilized chromatographic and spectroscopic techniques to characterize the structure of coal and derived materials. Pyrolysis coupled to gc/ms was conducted with and without methylating agent (tetramethyl ammonium hydroxide). The pyrolysis study resulted in releasing mainly fatty acid methyl esters, different series of hydrocarbons and α, ω-dicarboxylic acid methyl esters. Triterpenoids, syringic and ρ-coumaric compounds and aromatic compounds derived from lignin moieties were also detected. Fourier transform infrared (FT-IR) and NMR data helped to evaluate the influence of coal rank on regeneration and nitration processes with respect to chemical structural composition of coal and derived materials. FT-IR spectra of four materials were similar except that NHA showed an absorption band at 1532cm−1, thus confirming the presence of -NO2 groups. 13C NMR indicated higher aromaticity and less hydroxylalkyl material in HAL than NHA. The elemental composition and acid functional group content of four materials were also reported. The combination of results from different analytical techniques gives an improved understanding of the Pakistan coal nature and helpful for its future utilization.
- Publisher
- Elsevier
- Relation
- Fuel Processing Technology Vol. 92, no. 5 (2011/05/01/ 2011), p. 983-991
- Rights
- Copyright
- Rights
- This metadata is freely available under a CCO license
- Subject
- Lignite; Humic acids; Nitrohumic acids; Elemental analysis; C CP/MAS NMR; Pyrolysis; 0306 Physical Chemistry (Incl. Structural); 0904 Chemical Engineering; 0914 Resources Engineering and Extractive Metallurgy
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