Effect of potassium-doping and oxygen concentration on soot oxidation in O 2 /CO 2 atmosphere: A kinetics study by thermogravimetric analysis

Wang, Xuebin; Li, Shuaishuai; Adeosun, Adewale; Li, Yan; Vujanović, Milan; Tan, Houzhang; Duić, Neven

doi:10.1016/j.enconman.2017.01.003

Cited by 66 publications

(25 citation statements)

References 48 publications

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“…In order to investigate the combustion characteristic of coal samples at various stages, the peak reaction rate temperature ( T max1 , T max2 , and T max3 ), the maximum reaction rate (DTG max1 , DTG max2 , and DTG max3 ), and mean reaction rate (DTG mean ) were all acquired from Figure 5. The comprehensive combustion index ( S ) is a vital parameter to evaluate the overall combustion performance of the coal samples during the whole combustion process, 29 which was determined by Equation ().

S goodbreak= \frac{{DTG}_{\max} {DTG}_{mean}}{{T_{i}}^{2} T_{h}},

…”

Section: Resultsmentioning

confidence: 99%

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An effective method to remove organic sulfur in coal: Effects on the physicochemical properties and combustion kinetics

Liu

et al. 2021

Environ Prog Sustainable Energy

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The present work investigated an effective method to remove organic sulfur in coal utilizing different microorganisms (Nocardia mangyaensis and Pseudomonas putida).The most obvious finding to emerge from the sulfur forms analysis is that the organic sulfur removal of these two bacterial strains on Yunnan bumuga high-sulfur coal were 61.58% and 54.19%, respectively. This result may be confirmed by the Fourier transform infrared spectroscopy (FTIR) analyses that there were obvious decreases of intensity after biotreatment in the C S bond. Besides, the results of X-ray diffraction and X-ray photoelectron spectroscopy showed that major mineralogical phases in the forms of kaolinite and pyrite exist in raw coal. And more than 80% of thiophene and sulfoxide in the raw coal were removed by N. mangyaensis and P. putida. In addition, the results of the thermogravimetric analysis indicated that the combustion performance of biotreated coal samples was better than that of raw coal, and the most probable models to describe the combustion kinetics for biotreated coal and raw coal at different stages were obtained by the Arrhenius method and Coats-Redfern method.

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S goodbreak= \frac{{DTG}_{\max} {DTG}_{mean}}{{T_{i}}^{2} T_{h}},

…”

Section: Resultsmentioning

confidence: 99%

“…), and mean reaction rate (DTG mean ) were all acquired from Figure 5. The comprehensive combustion index (S) is a vital parameter to evaluate the overall combustion performance of the coal samples during the whole combustion process, 29 which was determined by Equation (1).…”

Section: Xps Analysismentioning

confidence: 99%

An effective method to remove organic sulfur in coal: Effects on the physicochemical properties and combustion kinetics

Liu

et al. 2021

Environ Prog Sustainable Energy

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“…The comparison between reaction at 500 °C in 1 Pa O 2 and air shows that a higher O 2 partial pressure can increase the normalized reaction rate and hence the catalyst mobility. This is because the O 2 partial pressure can affect oxygen adsorption on the ceria catalyst and diffusion to the reactive sites and thereby affect the oxidation rate 42 . The effect of temperature on catalytic carbon oxidation can be revealed by comparing the reaction in 1 Pa O 2 at 500 °C and 800 °C.…”

Section: Resultsmentioning

confidence: 99%

Real-Time Observation of Carbon Oxidation by Driven Motion of Catalytic Ceria Nanoparticles within Low Pressure Oxygen

Sediako

Zhao

et al. 2019

Sci Rep

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Carbon particulate matter (PM) is an undesirable aerosol pollutant formed from combustors such as power plants, refineries, and engines. The most common and effective method of mitigating PM emission is the capture of particulates using a filter, before particles are released into the atmosphere. In order to develop and improve advanced filtering materials, a better understanding is required of their chemical and mechanical behavior. We report on a novel phenomenon on the mobility and oxidation behavior of catalytic iron doped ceria nanoparticles in contact with mobile carbon black nanoparticles. The process is recorded by real time imaging within an environmental transmission electron microscope. In contrast to observations in previous studies, the separated ceria nanoparticles are found to actively move on the substrate and consume the connecting carbon particles one-by-one. The velocity of particle motion is correlated to the reaction temperature and oxygen pressure, both determining the reaction rate. Modeling using the Density Functional Theory suggests this motion is driven by the chemical bonding between the surface oxygen of the catalyst and the graphite layers of carbon black, initiated through the Van der Waals force between two types of nanoparticles.

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“…Thermal gravimetric analysis is an important method to explore the oxidation characteristics of particles [39,40]. [37,41] ), as shown below:…”

Section: Experimental Methods and Proceduresmentioning

confidence: 99%

Effects of iron-based fuel borne catalyst addition on microstructure, element composition and oxidation activity of diesel exhaust particles

Liu

Wang

Sun

et al. 2020

Fuel

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Metal-based fuel borne catalysts (FBC) have been extensively studied as an effective technology to reduce diesel particles and assist diesel particulate filter (DPF) regeneration. In this study, FBC fuels were prepared with Fe element mass fractions of 0, 100, 200, 300 and 400 mg/kg (marked as Diesel, Fe100, Fe200, Fe300 and Fe400). The effects of FBC additions on fuel economy and emission characteristics were carried out on a common-rail engine. Also, particle size distribution, microstructure, surface functional groups, element content and oxidation properties of exhaust particles were systematically analyzed. Results showed that the brake thermal efficiency was improved with the addition of FBC in diesel fuel, especially at low load, and the NOx and smoke emissions showed a decreasing trend. Compared with Diesel particles, the total mass concentration and the mean particle diameter of Fe300 particles decreased, the overall particle size distribution moved from coarse mode to accumulation mode, however, the total number concentration increased. Fe300 particles had larger layer spacing and microcrystalline curvature, smaller microcrystalline size and lower graphitization. In addition, the relative contents of OH and aliphatic C-H in Fe300 particles were higher than those in Diesel particles. The relative content of C atoms in Fe300 particles decreased, while the relative content of O atoms increased. Temperature-programmed-oxidation experiments indicated that semi-volatile organic components appeared in Fe300 particles, the peak temperature of weight loss rate decreased by 131 °C as compared with Diesel particles, the activation energy was also significantly lower, and therefore the particle oxidation activity was improved.

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Effect of potassium-doping and oxygen concentration on soot oxidation in O 2 /CO 2 atmosphere: A kinetics study by thermogravimetric analysis

Cited by 66 publications

References 48 publications

An effective method to remove organic sulfur in coal: Effects on the physicochemical properties and combustion kinetics

An effective method to remove organic sulfur in coal: Effects on the physicochemical properties and combustion kinetics

Real-Time Observation of Carbon Oxidation by Driven Motion of Catalytic Ceria Nanoparticles within Low Pressure Oxygen

Effects of iron-based fuel borne catalyst addition on microstructure, element composition and oxidation activity of diesel exhaust particles

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