Carbon nanostructure and reactivity of soot particles from non-intrusive methods based on UV-VIS spectroscopy and time-resolved laser-induced incandescence

Hagen, Fabian P.; Kretzler, Daniel; Häber, Thomas; Bockhorn, Henning; Suntz, Rainer; Trimis, D.

doi:10.1016/j.carbon.2021.06.006

Cited by 26 publications

(14 citation statements)

References 107 publications

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“…Moreover, for semiconductor, the wider band gap corresponds with less absorbance for white exciting light 23 . Herein, the higher reflection coefficient for discharged Co(OH)2 electrode (than charged electrode) means bigger band gap.…”

Section: Figurementioning

confidence: 99%

Studying charge-carrier intercalation/deintercalation in energy storage materials by optical spectroscopy

Chen

Huan

Sun

et al. 2022

Preprint

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Understanding how charge-carrier intercalation/deintercalation that affects the charge-discharge process is essential for the development of efficient energy storage materials. So far, a clear understanding about the relationship of charge-discharge process of energy storage materials with the corresponding changes of energy band structure is still lacking. Here, using optical spectroscopy (RGB value, reflectivity, transmittance, UV-vis, XPS, UPS) to study α-Co(OH)2 electrode working in KOH electrolyte as research object, we provide direct experimental evidence that: 1) the intercalation of OH– ions will reduce the valence/conduction band (VB and CB) and band gap energy (Eg) values; 2) the deintercalation of OH– ions corresponds with the reversion of VB, CB and Eg to the initial values; 3) the color of Co(OH)2 electrode also exhibit regular variations in Red-Green-Blue (RGB) value during the charge-discharge process.

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Section: Figurementioning

confidence: 99%

Studying charge-carrier intercalation/deintercalation in energy storage materials by optical spectroscopy

Chen

Huan

Sun

et al. 2022

Preprint

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“…However, soot produced by ethylene combustion contains a higher organic and amorphous carbon content than aircraft soot from jet fuel combustion . In particular, Raman spectroscopy showed that the oxidative reactivity of soot increases with its amorphous carbon content . Recently, the impact of air injection downstream of jet fuel combustion was elucidated in a laboratory RQL combustor .…”

Section: Introductionmentioning

confidence: 99%

“…Most importantly, the Raman spectrum of soot from ESC of jet fuel is in excellent agreement with that measured from aircraft soot (Figure S2). This indicates that the oxidative reactivity of such surrogate aircraft soot is similar to that of aviation emissions . So, the elimination of such soot is investigated here by injecting N 2 containing 0–25 vol % of O 2 downstream of ESC of jet fuel.…”

Section: Introductionmentioning

confidence: 99%

Toward Elimination of Soot Emissions from Jet Fuel Combustion

Kelesidis

Nagarkar

Trivanovic

et al. 2023

Environ. Sci. Technol.

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Soot from jet fuel combustion in aircraft engines contributes to global warming through the formation of contrail cirrus clouds that make up to 56% of the total radiative forcing from aviation. Here, the elimination of such emissions is explored through N 2 injection (containing 0−25 vol % O 2 ) at the exhaust of enclosed spray combustion of jet fuel that nicely emulates aircraft soot emissions. It is shown that injecting N 2 containing 5 vol % of O 2 enhances the formation of polyaromatic hydrocarbons (PAHs) that adsorb on the surface of soot. This increases soot number density and volume fraction by 25 and 80%, respectively. However, further increasing the O 2 concentration to 20 or 25 vol % enhances oxidation and nearly eliminates soot emissions from jet fuel spray combustion, reducing the soot number density and volume fraction by 87.3 or 95.4 and 98.3 or 99.6%, respectively. So, a judicious injection of air just after the aircraft engine exhaust can drastically reduce soot emissions and halve the radiative forcing due to aviation, as shown by soot mobility, X-ray diffraction, Raman spectroscopy, nitrogen adsorption, microscopy, and thermogravimetric analysis (for the organic to total carbon ratio) measurements.

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“…On the macroscopic scale, the oxidation reactivities of soot are correlated to the physicochemical properties. Employing Raman spectroscopy, ultraviolet-visible (UV-VIS) absorption spectroscopy, and other analytical methods, extensive studies have shown that the oxidation reactivities of soot highly depend on carbon structures [3,15,16]. The soot aging process in high-temperature furnaces involves carbonization, surface growth, and coagulation, causing soot particles consist of carbon structures with different degrees of graphitization [17].…”

Section: Introductionmentioning

confidence: 99%

Non-catalytic oxidation mechanism of industrial soot at high temperature

Wang

Gao

Jiang

et al. 2023

Preprint

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The elimination of soot is particularly crucial in the pursuit of reducing pollutant emissions and achieving a circular economy. The generation of soot is a significant challenge in industries. The most effective approach to eliminate soot is to oxidize it in the high-temperature furnace. In this study, soot with different properties was produced the by non-catalytic partial oxidation process at high temperatures. The real-time oxidation processes of soot nanoparticles at 900°C were studied by in situ transmission electron microscopy (TEM). The industrial soot performs various oxidation models. The corresponding mathematical expressions of different oxidation models were developed. The incipient soot of shrinking core model (SCM) has a faster reaction rate than the partially matured soot of internal oxidation model (IOM) and the mature soot of SCM. A rare core-shell separation model (CSM) was studied. The nanostructures of soot in different oxidation models were characterized, and the relationship between macroscopic properties and nanostructures was established by Raman results and lattice fringe analysis, effective in the prediction of soot oxidation behavior.

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Carbon nanostructure and reactivity of soot particles from non-intrusive methods based on UV-VIS spectroscopy and time-resolved laser-induced incandescence

Cited by 26 publications

References 107 publications

Studying charge-carrier intercalation/deintercalation in energy storage materials by optical spectroscopy

Studying charge-carrier intercalation/deintercalation in energy storage materials by optical spectroscopy

Toward Elimination of Soot Emissions from Jet Fuel Combustion

Non-catalytic oxidation mechanism of industrial soot at high temperature

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