Yu-Gao Wang

The Enrichment and Identification of Methyl Alkanones from Thermally Soluble Shengli Lignite

Shengli lignite was subjected to thermal dissolution in a methanol/benzene mixed solvent at 240°C for 1 h. The soluble fraction was sequentially eluted with petroleum ether and 5, 10, and 15% carbon disulfide/petroleum ether mixed solvents through a silica gel-packed column to afford eluted fractions 1 to 4 (EF1 to EF4). In total, 15 methyl alkanones from C15 to C27, including 2 methyl side-chain alkanones and 13 methyl straight-chain alkanones were enriched in EF4 and identified with gas chromatography/mass spectrometry.

Nitrogen-doped porous carbon foams prepared from mesophase pitch through graphitic carbon nitride nanosheet templates

A scalable and facile method was developed to synthesize nitrogen-doped porous carbon foams (NDPCFs) using graphitic carbon nitride (g-C3N4) nanosheets as hard templates through the calcination of mesophase pitch. The morphology, structure, chemical composition and electrochemical performance of the as-prepared NDPCFs were characterized and investigated. The results show that NDPCFs are fabricated from crimpled and folded carbon nanosheets and have a three-dimensional interconnected structure. The carbon nanosheets show a certain degree of orientation of graphite crystallites. The specific surface area, wall thickness and nitrogen content are controllable by tuning the mass ratio of g-C3N4 nanosheets to mesophase pitch. The content of nitrogen species, most of which are quaternary-N and pyridinic-N components, significantly decreases from 6.48 to 0.74 at% with raising calcination temperature from 800 to 1600 °C. The NDPCFs prepared at 800 °C have a high specific surface area of 2098 m2 g−1, an ultra-large pore volume of 5.048 cm3 g−1 and a high nitrogen content of 6.48 at%. Furthermore, this material exhibits remarkable electrochemical performance as an electrode material for supercapacitors with a specific capacitance of 125.6 F g−1 even at a high scan rate of 200 mV s−1.

The Identification of Organooxygen Compounds in Geting Bituminous Coal

Geting bituminous coal was sequentially extracted with petroleum ether, carbon disulfide, methanol, acetone, and isometric carbon disulfide/acetone mixed solvent at room temperature, affording extracts 1 to 5 (E1 to E5). In total, 77 organooxygen compounds (OOCs) were identified from E3 by gas chromatography/mass spectrometry analysis. The OOCs include 4 alkanols, 8 arenols, 5 ethers, 5 aldehydes, 14 non-nitrogen ketones, 19 nitrogen-containing ketones, 11 alkanoic acids, and 11 esters. This investigation provides an effective approach to the enrichment of OOCs in coals, favoring understanding of the diversity of the organooxygen compounds.

Mild oxidation of Jincheng NO. 15 anthracite

Abstract Jincheng NO. 15 anthracite (J15A) was subjected to ruthenium ion-catalyzed oxidation to characterize its structural feature. The results show that J15A is abundant in peri -condensed aromatic structure. The NaOCl oxidation of J15A promoted by pretreatment with H 2 O 2 was conducted under mild conditions to produce benzene polycarboxylic acids (BPCAs). The pretreatment with H 2 O 2 is proved to enhance the yields of BPCAs. It is potential to obtain BPCAs in high yield and selectivity by NaOCl oxidation of pretreated J15A with H 2 O 2 .

The Isolation of Condensed Arenes from Shenmu-Fugu Coal Liquefaction Residue

Shenmu-Fugu subbituminous coal liquefaction residue was exhaustively extracted with petroleum ether (PE) to afford PE-extractable fraction (PEEF), which was then eluted with petroleum ether through a silica gel-filled column. The PEEF and eluates were analyzed with a gas chromatographer/mass spectrometer and a Fourier transform infrared spectrometer. As a result, a number of 4- to 7-ring condensed arenes (CAS) were detected in the PEEF series of 4- to 6-ring CAs along with long-chain alkanes were isolated from the PEEF by column chromatography.

Compositional features of extracts from Shenmu char powder

Abstract Shenmu char powder (SCP) was sequentially extracted with petroleum ether, carbon disulfide, dichloromethane, acetone, and methanol in a Soxhlet extractor to obtain extracts 1–5 (E 1–5 ) and final residue. The total extract yield of SCP is 1.76%. All the extracts were characterized with gas chromatograph/mass spectrometer (GC/MS), atmospheric solid analysis probe/time-of-flight mass spectrometer (ASAP/TOF-MS), and electrospray ionization/time-of-flight mass spectrometer (ESI/TOF-MS). Normal alkanes with C 15 to C 24 and arenes with 3 and 4 rings are predominant in E 1 and E 2 , respectively, while more heteroatom-containing organic species were identified in E 3–5 . Organooxygen compounds are the most abundant in E 4 and E 5 based on analysis with GC/MS. Much more heteroatom-containing organic compounds were detected in E 3–5 with ASAP/TOF-MS and ESI/TOF-MS than with GC/MS.

Mechanism analysis for supercritical ethanolysis of Huolinguole lignite

Abstract The dehydrated Huolinguole lignite (HL), along with the extracts and the extraction residues obtained from the supercritical ethanolysis of HL, was analyzed by Fourier transform infrared spectrometry (FT-IR). The extracts were further analyzed by gas chromatography/mass spectrometry. The mechanism that was utilized for the supercritical ethanolysis of HL was discussed according to the analytical results. The supercritical ethanolysis of HL includes alkyl substitution and cleavage of ether bonds. The cleavage of ether bonds mainly occurs in aliphatic ether bonds.

Separation and Analysis of the Products from Supercritical Ethanolysis of Huolinguole Lignite

The ethanol-soluble portion from supercritical ethanolysis of Huolinguole lignite was separated by silica-gel column chromatography. Hydroxybenzenes and normal alkanes were concentrated to large extents, respectively. A series of ethyl alkanoates and ethyl alkenoates were detected. Two alkylpyridines were enriched in high concentrations.

The Isolation of Condensed Aromatics from a High-temperature Coal Tar

A high-temperature coal tar collected from Xuzhou Coking Plant, Saint-Gobain Pipelines (Xuzhou) Co., Ltd. was exhaustively extracted with petroleum ether (PE). The extract was sequentially eluted with PE and PE/carbon disulfide mixed solvent with PE volume contents of 90, 80, 60, 50, and 40% to afford eluates 1 to 6 (E 1 to E 6), respectively. The eluates were analyzed with gas chromatography/mass spectrometer. In total, 12 condensed arenes with 3 to 6 rings and 14 heteroatomic condensed aromatics with 2 to 4 rings were detected in E 4 to E 6.

Identification of Organonitrogen Compounds in Petroleum Ether-soluble Fraction from a High-temperature Coal Tar

A high-temperature coal tar collected from Xuzhou Coking Plant, Saint-Gobain Pipelines (Xuzhou) Co., Ltd. was extracted with petroleum ether (PE) under ultrasonic irradiation and in a Soxhlet extractor. The residue was then extracted with methanol in the Soxhlet extractor. All the extracts were analyzed with gas chromatography/mass spectrometry (GC/MS). More than 250 organic compounds were detected in the PE-soluble fraction, but no GC/MS-detectable species (GC/MS-DSs) in the methanol-soluble but PE-insoluble fraction, indicating that all the GC/MS-DSs were extracted as PE. The GC/MS-DSs include various nitrogen-containing ones, many of which were seldomly reported. Nitrogen-containing organic compounds (NCOCs) detected are aniline, indole, quinoline, isoquinoline, methylquinolines, naphthonitriles, 8-(dimethyl-amino)-1-naphthonitrile, 3-methylindazole, acridine, benzoquinoline, benzoacridine, benzoisoquinolines, carbazole, methylcarbazole, phenanthridine, (Z)-N-(1-phenylethylidene)methanamine, benzocarbazoles, acenaphthopyridine and 2-methylcarbazole. Understanding molecular composition of the NCOCs in coal tar is important for developing an effective coal tar separation process.