Soot oxidation kinetics under pressurized conditions

Jaramillo, Isabel Cristina; Gaddam, Chethan K.; Wal, Randy L. Vander; Huang, Chenfu; Levinthal, J.; Lighty, JoAnn S.

doi:10.1016/j.combustflame.2014.04.016

Cited by 117 publications

(45 citation statements)

References 56 publications

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“…Fringe length data was used to estimate molecular weight distributions in the nematic phase (see Section 3.3). The results reported here are in agreement with those of [21], albeit produced by using a different method and have less measurement uncertainty. Figure 3 shows extracted interlayer spacing distributions.…”

Section: Quantitative Analysissupporting

confidence: 94%

“…The micrographs used for further quantification were produced at 500,000X magnification under slightly over-focused phase contrast conditions. Further details regarding the instrument and the sampling procedure to ensure representative image collection (sampling) may be found as previously reported [21].…”

Section: Hrtem Imagingmentioning

confidence: 99%

“…Similarly, discrepancies exist between observed oxidation rates [2] and the rates predicted by the Nagle-Strickland-Constable equation [20], which is applicable to describe the high-temperature oxidation of carbon blacks -these discrepancies are possibly caused by peculiarities of soot structure. The dependence of soot oxidation kinetics upon nanostructure was shown [21,22]. Hurt et al showed, that soot nanostructure can be qualitatively modeled by thermodynamic principles [23].…”

Section: Introductionmentioning

confidence: 98%

“…This paper is a follow-up of a previous study regarding pressure-dependent soot structure and reaction kinetics [21]. Soot was generated in an atmospheric flat flame and then oxidized in a high-pressure thermogravimetric analyzer (HTGA).…”

Section: Introductionmentioning

confidence: 99%

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The effect of oxidation pressure on the equilibrium nanostructure of soot particles

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Section: Quantitative Analysissupporting

confidence: 94%

Section: Hrtem Imagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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The effect of oxidation pressure on the equilibrium nanostructure of soot particles

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et al. 2015

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“…The sampling height was 27 mm for each flame. This deposition method was used in the previous studies [57][58][59]. Quartz plate was cooled by an aluminum cool dish at its top surface.…”

Section: Experimental Systemmentioning

confidence: 99%

Nanoscale Characteristics and Reactivity of Nascent Soot from n-Heptane/2,5-Dimethylfuran Inverse Diffusion Flames with/without Magnetic Fields

et al. 2018

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Abstract:In this study, the differences of nanostructure and oxidation reactivity of the nascent soot formed in n-heptane/2,5-dimethylfuran (DMF) inverse diffusion flames (IDF) with/without influence of magnetic fields were studied, and the effects of DMF-doped and magnetic fields were discussed. Morphology and nanostructures of the soot samples were investigated using high-resolution transmission electron spectroscopy and X-ray diffraction, and the oxidation reactivity characteristics were analyzed by thermogravimetric analyzer. Results demonstrated that both additions of DMF-doped and magnetic fields could promote soot production and modify the soot nanostructure and oxidation reactivity in IDF. Soot production increased along with the increase of DMF-doped. With DMF blends, more clustered soot particles and typical core-shell structures with well-organized fringes were exhibited compared with that formed from the pure n-heptane IDF. With effects of magnetic fields, the precursor formation and the oxidization of soot were promoted, soot production was enhanced. Soot particles became relatively more mature with typical core-shell structure, thicker shell, longer fringe lengths, smaller fringe tortuosity, higher graphitization degree and lower oxidation reactivity. With magnetic force pointed to the central line and the inner direction of IDF under the conditions of N pole and S pole of the magnet facing the flame, oxygen was trapped, having an increased residence time to get more chance to react with the fuel molecules to cause more soot to be yielded and oxidized. That resulted in the soot precursor promotion, soot production enhancement, and soot part-oxidization and graphitization.

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A review of the mineralogical and chemical composition of nanoparticles associated with coal fires

et al. 2022

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This review summarizes our current knowledge on the health and environmental impact as well as the mineralogical and geochemical composition of nanoparticles (NPs) associated with coal fires. It will furthermore recommend new sampling and characterization protocols to gain a better understanding of the various types of NPs that are formed either through high-temperature nucleation and alteration processes or via low-temperature dissolution-reprecipitation and weathering processes. Coal fires affect the immediate environment of coal-producing areas and produce positive and negative feedback to climate change through the emission of carbon-and sulfate-bearing gases and aerosols, respectively. Nanoparticles form during and after coal fires. They are composed of mainly soot and tar particles as well as amorphous phases, minerals, and complex mixtures of amorphous phases and minerals. It is recommended that NPs for mineralogical studies should be collected using impactors (a new generation of collectors for particulate matter, such as the TPS100 NP sampler) or that borosilicate filters at the openings of pipes and chambers be used to collect and measure gases emitted by coal fires. Furthermore, assemblages of NPs occurring at the mouths of coal fire vents should be examined using a combination of focused ion beam (FIB) technology and transmission electron microscopy (TEM), and those containing ion-or electron-beam sensitive phases should be examined with the corresponding cryo-techniques, such as cryo-FIB, cryo-ion mill, and cryo-TEM.The mineralogical and chemical composition of NP-bearing bulk samples should be examined with spectroscopy techniques such as X-ray photoelectron spectroscopy, 13 C nuclear magnetic resonance spectroscopy, or time-of-flight secondary ion mass spectroscopy.

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Soot oxidation kinetics under pressurized conditions

Cited by 117 publications

References 56 publications

The effect of oxidation pressure on the equilibrium nanostructure of soot particles

The effect of oxidation pressure on the equilibrium nanostructure of soot particles

Nanoscale Characteristics and Reactivity of Nascent Soot from n-Heptane/2,5-Dimethylfuran Inverse Diffusion Flames with/without Magnetic Fields

A review of the mineralogical and chemical composition of nanoparticles associated with coal fires

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