Composition of the heteroorganic compounds of oil shale in Cambrian rocks from the east of the Siberian Platform

Каширцев, В. А.; Kovalenko, E. Yu.; Min, R. S.; Sagachenko, T. A.

doi:10.3103/s0361521909040016

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…In addition, absorption bands observed in the spectra of C-3 at 3600, 3585, and 1037 cm –1 suggest the possible presence of hydroxypyridines and their benzologues and sulfoxides in the mixture. Nitrogen-containing sulfoxides, which are similar in their properties to weakly basic nitrogen compounds, can be extracted from complex organic mixtures along with them …”

Section: Resultsmentioning

confidence: 99%

“…Nitrogen-containing sulfoxides, which are similar in their properties to weakly basic nitrogen compounds, can be extracted from complex organic mixtures along with them. 82 The use of the GC−MS method made it possible to identify C 2 −C 3 quinolines and C 2 −C 5 benzoquinolines as components of low-molecular-weight NBs (Figure 12). The presence of structures containing only methyl substituents was established for them.…”

Section: Energy and Fuelsmentioning

confidence: 99%

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Resins and Asphaltenes of Light and Heavy Oils: Their Composition and Structure

et al. 2019

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The complex of physicochemical methods of analysis (elemental analysis, cryoscopy in benzene, IR and 1H NMR spectroscopies, structural group analysis, gas chromatography–mass spectrometry, and selective chemical cleavage of sulfide and ether bonds) is used to comparatively characterize resins and asphaltenes of light and heavy oils. Attention is paid to the study of their structural group composition and the composition of moieties bound in molecules of resin–asphaltene substances (RAS) through ether and sulfide bridges, as well as the composition of compounds occluded by asphaltene molecules and nitrogen bases of resins. It is found that resins and asphaltenes of the heavy oil are characterized by higher average molecular masses and large overall sizes of mean molecules, due to the increased content of aromatic cycles in the naphthenic–aromatic system. The similar sets of linear and branched alkanes, alkylcyclopentanes, alkylcyclohexanes, steranes, mono- and disubstituted alkylbenzenes, and dibenzothiophenes identified in occluded compounds and products of chemolysis of resins and asphaltenes under study suggest the presence of most of these compounds as structural fragments in RAS molecules of light and heavy crude oils under study. Alkyl-substituted quinolines and benzoquinolines are identified in the nitrogen bases of resins. The feature of the light oil is the presence of “sulfur-bound” alkenes and polycycloalkenes in the structure of its asphaltenes. The findings expand our understanding of the structure of petroleum resins and asphaltenes. They can be used to simulate their structure in developing new controlled methods for processing hydrocarbon feedstock.

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Section: Resultsmentioning

confidence: 99%

Section: Energy and Fuelsmentioning

confidence: 99%

Resins and Asphaltenes of Light and Heavy Oils: Their Composition and Structure

et al. 2019

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“…Compared to the rest of the samples in our study, this group of chromophores is much more abundant in urban samples U1 and U2 (Table S1). Some chromophores can be possibly assigned to the reduced sulfur species, like chromophores #28, #65, and #72, which are probably from combustion of fossil fuels . Several species plausibly related to biomass-burning emissions are observed exclusively in urban samples as well, including nitrogen-containing species (chromophores #3, #10, #35, #37, #59, and #71) and oxygenated polycyclic aromatic hydrocarbons (chromophore #46) .…”

Section: Resultsmentioning

confidence: 99%

“…Some chromophores can be possibly assigned to the reduced sulfur species, like chromophores #28, #65, and #72, which are probably from combustion of fossil fuels. 111 Several species plausibly related to biomass-burning emissions are observed exclusively in urban samples as well, including nitrogencontaining species (chromophores #3, #10, #35, #37, #59, and #71) and oxygenated polycyclic aromatic hydrocarbons (chromophore #46). 112 Most of these chromophores correlate with multiple coeluting compounds inherent to the chemical complexity of our samples.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Molecular Characterization of Water-Soluble Brown Carbon Chromophores in Snowpack from Northern Xinjiang, China

Zhou

West

Hettiyadura

et al. 2022

Environ. Sci. Technol.

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This study reports molecular-level characterization of brown carbon (BrC) attributed to water-soluble organic carbon in six snowpack samples collected from northern Xinjiang, China. The molecular composition and light-absorbing properties of BrC chromophores were unraveled by application of high-performance liquid chromatography (HPLC) coupled to a photodiode array (PDA) detector and high-resolution mass spectrometry. The chromophores were classified into five major types, that is, (1) phenolic/lignin-derived compounds, (2) flavonoids, (3) nitroaromatics, (4) oxygenated aromatics, and (5) other chromophores. Identified chromophores account for ∼23–64% of the total light absorption measured by the PDA detector in the wavelength range of 300–370 nm. In the representative samples from urban and remote areas, oxygenated aromatics and nitroaromatics dominate the absorption in the wavelengths below and above 320 nm, respectively. The highly polluted urban sample shows the most complex HPLC-PDA chromatogram, and more other chromophores contribute to the bulk absorption. Phenolic/lignin-derived compounds are the most light-absorbing species in the soil-influenced sample. Chromophores in two remote samples exhibit ultraviolet–visible features distinct from other samples, which are attributed to flavonoids. Identification of individual chromophores and quantitative analysis of their optical properties are helpful for elucidating the roles of BrC in snow radiative balance and photochemistry.

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