Thermal Degradation of Asphaltene and Infrared Characterization of Its Degraded Fractions

Huang, J.

doi:10.1081/lft-200056601

Cited by 11 publications

(8 citation statements)

References 7 publications

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“…State-of the art techniques for the chemical characterization of asphaltenes on the molecular level are mainly mass spectrometric approaches, such as direct infusion atmospheric pressure ionization ultrahigh-resolution mass spectrometry. ,, In addition, high-field nuclear magnetic resonance (NMR) spectroscopy and absorption spectroscopic approaches, such as X-ray absorption near edge structure (XANES) − as well as high-performance liquid chromatography, are deployed . Thermal analysis (TA), regarding evolved gas analysis, coupled to various analytical detectors has also become a powerful tool in petroleum analysis and other areas. − Besides spectroscopic approaches, such as infrared spectroscopy for fingerprint pattern or small-molecule quantification, ,, mass spectrometry is the favored coupling technique. ,, For heavy petroleum, thermal analysis is primarily applied for studying the evaporation pattern as well as the thermal decomposition products at an elevated temperature during pyrolysis. − Pyrolysis gas chromatography was conducted extensively with low resolving mass analyzers and hard ionization to study thermal decomposition products since the 1980s. − …”

Section: Introductionmentioning

confidence: 99%

“…13 Thermal analysis (TA), regarding evolved gas analysis, coupled to various analytical detectors has also become a powerful tool in petroleum analysis and other areas. 14 Besides spectroscopic approaches, such as infrared spectroscopy for fingerprint pattern or small-molecule quantification, 15,20,21 mass spectrometry is the favored coupling technique. 14,16,18 For heavy petroleum, thermal analysis is primarily applied for studying the evaporation pattern as well as the thermal decomposition products at an elevated temperature during pyrolysis.…”

Section: ■ Introductionmentioning

confidence: 99%

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Combination of Different Thermal Analysis Methods Coupled to Mass Spectrometry for the Analysis of Asphaltenes and Their Parent Crude Oils: Comprehensive Characterization of the Molecular Pyrolysis Pattern

et al. 2017

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In this study, the asphaltene and corresponding crude oil, distributed within the Asphaltene Characterization Interlaboratory Study for PetroPhase 2017, were characterized on the molecular level. For this purpose, three different thermal analysis mass spectrometry hyphenations with five diverse ionization techniques varying in selectivity were deployed: (1) thermal desorption/pyrolysis gas chromatography electron ionization (TD/Pyr–GC–EI–QMS), (2/3) thermogravimetry single-photon/resonance-enhanced multiphoton ionization time-of-flight (TG SPI/REMPI TOF–MS), and (4/5) thermogravimetry atmospheric pressure photo-/chemical ionization ultrahigh-resolution mass spectrometry (TG APPI/APCI FT-ICR MS). For the investigated C7 asphaltene, no mass loss was detected at <300 °C and the pyrolysis phase was dominant, whereas the parent crude oil exhibits a high abundant desorption phase. At roughly 330 °C, pyrolysis begins and mass loss as well as complex mass spectrometric patterns were recorded. The resulting information on the effluent gained by the different soft ionization mass spectrometric approaches was combined with the GC–EI–MS data for structural cross-evaluation. We showed that the combination of the applied techniques leads to a more comprehensive chemical characterization. For the asphaltene, TG SPI TOF–MS shows high abundances of alkanes, alkenes, and hydrogen sulfide during pyrolysis. TG REMPI TOF–MS is selective toward aromatics and reveals clear patterns of polyaromatic hydrocarbons (PAHs) and minor amounts of nitrogen-containing aromatics tentatively identified as acridine- or carbazol-like structures. GC–EI–MS provides information on the average chain length of alkanes, alkenes, and PA(S)H. Both atmospheric pressure ionization techniques (APPI and APCI) hyphenated to FT–MS showed CHS (in particular, benzothiophenes) and CH as dominant compound classes, with an average number of condensed aromatic rings of 2–4. Combining the information of all techniques, including the average asphaltene mass obtained by field desorption experiments and aromatic core size received by collision-induced dissociation, the archipelago-type molecular structure seems to be dominant for the investigated asphaltene.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Combination of Different Thermal Analysis Methods Coupled to Mass Spectrometry for the Analysis of Asphaltenes and Their Parent Crude Oils: Comprehensive Characterization of the Molecular Pyrolysis Pattern

et al. 2017

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“…Moreover, the similarity in FTIR spectra among the three samples precludes the hypothesis that the 12 h heat treatment for the in situ prepared nanoparticles results in different types of molecular structures [1]. In support of this conclusion, Huang [33] studied the effect of heat treatment on asphaltenes structure using FTIR and reported that, up to 450°C, the FTIR spectra for the heat treated and un-heat treated asphaltenes were similar with slight loss in aromatic properties for the heat treated samples.…”

Section: Effect Of Heat Treatment During Nanoparticle Preparationmentioning

confidence: 60%

Inferring the role of NiO nanoparticles from the thermal behavior of virgin and adsorbed hydrocarbons

Tarboush

Husein

2015

Fuel

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“…As a result, asphaltene and resin are more likely to be oxidized. Recent studies have been shown that there may be a considerable amount of oxidative aging in asphaltene. , Previous studies have shown that the resin component of asphalt is more likely to be oxidized than the asphaltene component. , Maltene is not reactive with oxygen. Only limited studies have been conducted on oxidative aging of asphalt .…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have been shown that there may be a considerable amount of oxidative aging in asphaltene. 13,14 Previous studies have shown that the resin component of asphalt is more likely to be oxidized than the asphaltene component. 15,16 Maltene is not reactive with oxygen.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamic Simulations for Determining Change in Thermodynamic Properties of Asphaltene and Resin Because of Aging

Tarefder

Arisa

2011

Energy Fuels

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In this study, a molecular dynamic (MD) simulation is employed to determine the thermodynamic properties of asphalt binder components, namely, asphaltene and resin, before and after oxidative aging. For oxidative aging of asphaltenes, the percentage of oxygen considered in MD simulations is 0.1, 1, 12, 23, and 46.5% of asphaltenes. For oxidative aging of resins, the percentage of oxygen used in MD simulations is 5, 15, and 25% of resins. Using few oxygen, asphaltene, and resin molecules as input, MD simulations are run on a system at a fixed number of molecules and pressure to predict internal energy, structure, and density as function of the temperature. Simulation outputs are analyzed to determine density, glass-transition temperature, and potential and kinetic energies of the system. Results show that density has an inverse relationship with the temperature for both asphaltene and resin systems. At high temperatures, asphaltene and resin molecules gain high thermal energy that makes the molecules mobile and capable of breaking molecular association. The density decreases with the increasing temperature because the free volume expands, with or without the association of molecules. The percentage of oxygen affects the glass-transition temperature. At low oxidation levels (<20%), asphaltene shows a constant glass-transition temperature of −5 °C. At high oxidation levels (>20%), the value of the glass-transition temperature of asphaltene decreases. In resin, no definite relationship between the glass-transition temperature and the oxidation level could be established through the approach used in this study. Finally, changes in potential and kinetic energies of asphaltene and resin because of oxidative aging are discussed.

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Thermal Degradation of Asphaltene and Infrared Characterization of Its Degraded Fractions

Cited by 11 publications

References 7 publications

Combination of Different Thermal Analysis Methods Coupled to Mass Spectrometry for the Analysis of Asphaltenes and Their Parent Crude Oils: Comprehensive Characterization of the Molecular Pyrolysis Pattern

Combination of Different Thermal Analysis Methods Coupled to Mass Spectrometry for the Analysis of Asphaltenes and Their Parent Crude Oils: Comprehensive Characterization of the Molecular Pyrolysis Pattern

Inferring the role of NiO nanoparticles from the thermal behavior of virgin and adsorbed hydrocarbons

Molecular Dynamic Simulations for Determining Change in Thermodynamic Properties of Asphaltene and Resin Because of Aging

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