GC/MS Analysis of Water-Soluble Products from the Mild Oxidation of Longkou Brown Coal with H₂O₂

Abstract

Longkou brown coal was oxidized by H 2 O 2 at 40 °C for 10 h. Water-phase fraction from the reaction mixture was extracted with chloroform to afford chloroform-soluble, chloroform-insoluble but water soluble (CIWS) and solid subfractions. A series of heteroatom(s)-containing organic compounds were detected with GC/MS from the CIWS subfraction. The heteroatoms included O, N, S, and Cl.

Biosolubilisation of Chinese lignite

“…Data was acquired and processed using Chemstation (software), and the compounds were analyzed by comparing mass spectra with NIST05 database. This GC/MS method was also reported by other researchers for analyses of the chemical compositions of different coal samples [16][17][18][19].…”

Enrichment and Identification of Arylhopanes from Shengli Lignite

“…It is well known that benzo [20,21]hopanes 4−7 (C 32−35 , 2) and benzo [16,17,21]hopanes 6,8,9 (C 31−35 , 3) are formed from compound 1 via the cyclization reactions at C20 and C16, respectively. Some compounds with fluorene and acenaphthene moieties (e.g., compounds 4 and 5) in coals should be partially produced from D-ring monoaromatic 8 (14)-secobenzo [20,21]hopanes 6,10,11 (C 32−35 , 6) and 8 (14)-secobenzo [16,17,21]hopanes 11,12 (C 31−35 , 7), which are produced from the corresponding benzohopanes (i.e., compounds 2 and 3) via aromatization and C8−C14 bond cleavage, respectively. Coals are rich in the compounds with two aromatic moieties linked by −(CH 2 ) n −, such as 1-benzylnaphthalene (8), but their origin is still unclear.…”

The Effect of Pretreatment with H2O2on the Oxidation of Shenfu Subbituminous Coal with NaOCl

“…Various NCSs were identified from extracts of coals Ding et al, 2008;Zong et al, 2009;Wei et al, 2009;Cao et al, 2010) and reaction mixtures of coals (Wei et al, 2002;Liu et al, 2003), but to the authors' knowledge, no reports were issued on the detection of any NCSs in the products from coal oxidation.…”