Chemical-structural properties of the coke produced by low temperature oxidation reactions during crude oil in-situ combustion

Xu, Qianghui; Liu, Zhiming; Jiang, Hang; Zhang, Qiang; Zan, Cheng; Ma, Dawei; Shi, Lin

doi:10.1016/j.fuel.2017.06.026

Cited by 22 publications

(13 citation statements)

References 28 publications

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“…The XRD and Raman studies of the LTO coke have been presented in ref . Similar to the LTO coke, the pyrolytic coke showed no characteristic peaks in the XRD spectra within the range of 10° ≤ 2θ ≤ 110°.…”

Section: Resultsmentioning

confidence: 90%

“…Raman spectra were acquired using a LabRAM HR800 spectrometer at 325 nm excitation wavenumber. These detailed spectrum characterization methodologies were introduced in ref . The oxidation relativities of different coke were evaluated by a thermogravimetric analyzer (Q500, TA).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The significant different coke formation phenomena make it more complex to predict the coke yield. To the best of our knowledge, the chemical–structural comparisons of the pyrolytic coke were little studied and compared with the LTO coke . The investigations on the coke chemical–structural property difference can provide a new insight to further understand the different coke formation behaviors.…”

Section: Introductionmentioning

confidence: 99%

“…Cinar et al characterized the O-containing groups by X-ray photoelectron spectroscopy (XPS) without any structural information. Actually, it is difficult to characterize the coke, which deposited on the sand grain surface because of the effects of trace coke yield, irregular morphology, and mineral composition . The experimental methodology should be developed to comprehensively characterize the crude oil ISC coke.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental methodology should be developed to comprehensively characterize the crude oil ISC coke. A novel coke formation method was proposed by Xu et al, which has been proved as an easy, quick, and controlled method for fundamental studies . As for the characterization method, various analytical techniques have been employed to characterize the chemical and structural properties of different carbonaceous materials, especially the coal and biomass chars. , For the structural information on carbon nanostructure, X-ray diffraction (XRD) can provide the average carbon crystalline lattice parameters such as the crystalline diameter and interlayer spacing. , However, little information can be acquired by XRD for amorphous structures.…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of a Low Asphaltene Crude Oil under Idealized in Situ Combustion Conditions

Jiang

et al. 2017

Energy Fuels

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The coke formation is crucial to the crude oil in situ combustion (ISC) process. This study provided some insights through analyzing the influences of temperature and reaction atmosphere on the coke chemical–structural property. Thin coke films were produced on the polished single-crystal Si surface from the Xinjiang crude oil. Their functional groups were compared by Fourier transform infrared spectroscopy (FTIR), while the nanostructures were characterized through Raman spectroscopy, X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM) techniques. In addition, the low-temperature oxidation (LTO) coke and the pyrolytic coke reactivities were investigated by thermogravimetric analyses. The results indicated that the main carbon structures in the pyrolytic coke were amorphous. No crystallization phenomena, such as the aromatic ring condensation and the planar stacking, were observed within the characteristic ISC pyrolytic temperature range. Despite the pyrolytic coke yield increase with the temperature, almost constant chemical–structural properties were conserved. This study compared the chemical–structural properties of the LTO coke and the pyrolytic coke from the ISC process. The greater oxidation rate of the LTO coke was attributed to the considerable O-containing groups.

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Section: Resultsmentioning

confidence: 90%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%