Enrichment and Identification of Arylhopanes from Shengli Lignite

Abstract

Four arylhopanes, i.e.,hopane, and 30-(thien-2-ylmethyl)hopane, were enriched from Shengli lignite, and their structures were tentatively identified by gas chromatography/mass spectrometry. Phenylhopanes were unreported before and thienylhopanes were rarely detected in coals. The nearly equal relative contents of 22-phenyl-30-norhopane and 22-(o-tolyl)-30-norhopane suggest that a hopanoid precursor with a longer side chain compared to bacteriohopanetetrol should exist in nature. A novel type of cyclization reaction (cyclized at C30) of hopanoid polyols was proposed.

Characterization of humic acids extracted from a lignite and interpretation for the mass spectra

“…2,3 Moreover, carbon emission and acid rain mostly induced by coal burning led us to reconsider the utilization of coal in clean and highly efficient ways. 4,5 Lignite is unsuitable for direct burning, but suitable for developing as a feedstock for value-added chemicals due to the high content of organic oxygen. [6][7][8] It is reasonable to utilize lignite for non-fuel purposes and important to understand the molecular composition of the organic species present in lignite.…”

Insight into the structural features of Zhaotong lignite using multiple techniques

“…A deep insight into the chemical structures of coals is significantly important for efficient utilization of coals, especially for obtaining value-added chemicals from coals [3][4][5]. Coals are too complex to be elaboratively characterized.…”

Identification of basic nitrogen compounds in ethanol-soluble portion from Zhaotong lignite ethanolysis by positive-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry

“…Obtaining detailed information on ONCs is difficult due to their low content in coals. Gas chromatography/ mass spectrometry (GC/MS) has been successfully applied in identification of some soluble species from coals [12][13][14][15][16][17][18][19], but detecting less volatile and/or thermally labile species is difficult using this technology. In addition, GC/MS analysis is easily affected by complex matrix and there are only limited standard libraries for the identification of detected species.…”