Y.-B. Wei

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.

Group separation and analysis of a carbon disulfide-soluble fraction from Shenfu coal by column chromatography

A carbon disulfide-soluble fraction (CDSSF) from Shenfu coal was separated into five fractions by silica-gel column chromatography using hexane and n-hexane/ethyl acetate binary eluent. The five fractions include four clear group fractions and a nonpolar fraction. All the fractions were analyzed by GC/MS. A total of 204 compounds were detected from the original CDSSF and its further separated fractions, with 173 compounds more than those detected by studying the original CDSSF directly. The results demonstrate a clear group separation by column chromatography in coal organic components and a more accessibility to coal components compared with the solvent extraction only.

Solid Superacid-catalyzed Hydroconversion of Demineralized Shengli Coal Liquefaction Residue under Microwave Irradiation

Abstract Shengli coal liquefaction residue was demineralized; the demineralized Shengli coal liquefaction residue (DMSCLR) was then subject to non-catalytic and SO4 2−/ZrO2- or SO4 2−/TiO2-catalyzed hydroconversion in methanol under microwave irradiation. The results show that both, SO4 2−/ZrO2 and SO4 2−/TiO2, significantly catalyzed DMSCLR hydroconversion. The MESs of hydrogenated DMSCLR were analyzed with gas chromatography/mass spectrometer. The MESs and methanol-inextractable fractions of hydrogenated DMSCLR were characterized with Fourier transform infrared spectrometer.

The Amorphous Alloy-catalyzed Hydroconversion of Demineralized Shengli Coal Liquefaction Residue Under Microwave Irradiation

Microwave-assisted hydroconversion of demineralized Shengli lignite liquefaction residue (DMSLLR) over Ni-B/SiO2 in methanol was investigated under mild conditions. The results show that Ni-B/SiO2 significantly catalyzed DMSLLR hydroconversion by increasing the methanol-extractable fraction of hydroconverted DMSLLR to 87.7% over Ni-B/SiO2 from 62.3% without catalyst. The yields of alkanes, hydroarenes, alkyl arenes, non-substituted arenes, organooxygen compounds, and organosulfur compounds from catalytic hydroconversion of DMSLLR are drastically higher than those from non-catalytic hydroconversion of DMSLLR. Benzo[ghi]perylene is the most abundant condensed arenes detected.

The Zeolite-catalyzed Hydroconversion of Demineralized Shengli Coal Liquefaction Residue Under Microwave Irradiation

Microwave-assisted hydroconversions of demineralized Shengli lignite liquefaction residue (DMSLLR) were investigated over different zeolites in methanol at 140°C. The catalytic effects of the zeolites on the yields and compositions of methanol-soluble portions (MSPs) as well as the structural features of the MSPs and methanol-insoluble portions (MISPs) were examined. The results show that the yields of the MSPs over different zeolites follow the order: HZSM-5 > Hβ > HY > HM; HZSM-5 and Hβ observably promoted DMSLLR hydroconversion to gas chromatography/mass spectrometry-detectable normal alkanes and oxygen-containing organic species, whereas much more arenes were detected in the MSPs from hydrotreated DMSLLR with HY and HM.

GC/MS Analysis of the Products from Supercritical Methanolysis of Rice-stalk Powder

Abstract Rice-stalk powder was heated in supercritical methanol at 300°C and the resulting products were analyzed with gas chromatography/mass spectrometer (GC/MS). After the supercritical methanolysis, more than 89% of organic mater in the rice-stalk powder was converted to methanol-soluble species, in which more than 100 organic compounds were detected and most of them are oxygen-containing ones, including ketones, hydroxybenzenes, esters, methoxyaromatics, aldehydes, alkanols, and carboxylic acids. Other species detected are alkanes, alkenes, arenes, and nitrogen- and sulfur-containing organic compounds.

Effect of Microwave Irradiation on a Mo-based Catalyst for CO Hydrogenation

Abstract A Mo-based catalyst (catalyst I) was prepared under microwave irradiation, and characterized with X-ray diffractometer, X-ray fluorescence spectrometry, nitrogen adsorption, Fourier transform infrared spectrometer, and scanning electron microscope. The activity of catalyst I for CO hydrogenation was studied in comparison with another Mo-based catalyst (catalyst II) prepared by conventional heating methods. The results show that CO conversion reached a maximum with temperatures up to 240°C over either of the catalysts. However, CO conversion and selectivities of methanol and dimethyl ether over catalyst I were higher than those over catalyst II, indicating that microwave irradiation favors the preparation of Mo-based catalyst for CO hydrogenation catalyst.