X-ray photoelectron spectroscopy study of oxidized coals with different sulphur content

Grzybek, Teresa; Pietrzak, Robert; Wachowska, Helena

doi:10.1016/s0378-3820(02)00058-9

Cited by 151 publications

(75 citation statements)

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“…The effect of PAA on the structure of Mequinenza (and the yield of soluble products) is much greater than that of nitric acid. The higher reactivity of PAA with this type of coal has also been characterised by XPS results [22]. The effect of PAA is also greater than that of nitric acid for Zofidwka coal, while the results for Czeczot and Siersza indicate the reverse; their conversion to soluble products is greater from the oxidation with nitric acid.…”

Section: Resultsmentioning

confidence: 72%

Studies of the soluble part of oxidised coals

et al. 2004

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Soluble products obtained from the oxidation of four types of coal, each characterised by different degree of coalification and different degree of sulphur content, are studied. The coals are oxidised with peracetic acid (PAA) and nitric acid. Analyses are performed by Atmospheric Pressure Temperature Programmed Reduction (AP TPR) and Fourier Transform Infl'ared Spectroscopy (FTIR). The soluble products contain much more sulphur than the insoluble products of oxidation. The products obtained fl'om the reaction with HNO3 contain higher amounts of inorganic sulphur compounds, while those obtained fl'om the reaction with PAA are characterised by an increased content of organic sulphur species.

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Section: Resultsmentioning

confidence: 72%

Studies of the soluble part of oxidised coals

et al. 2004

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“…Since the NH 3 /air mixture interacts with the surface of the materials which is degassed in the process condition and, additionally, modifying factor has oxidizing properties, it is easier to introduce nitrogen in high concentration as 5 wt% in PN sample (Table 6). Including air in modifying factor with NH 3 allows to decreases the effectiveness temperature of the N-doping process and for that reason at low temperatures such as 300°C our process of ammonization is efficient which greatly facilitates the formation of stable aromatic surface structures containing nitrogen [37][38][39] such as ammonium salts of surface oxygen groups which are hydrolyzed with small amounts of basic amine and amide whose links in the interaction with the carbonyl groups commonly found in carbon surface [39][40][41].…”

Section: Photodegradation Of Methylene Bluementioning

confidence: 99%

Eco-Friendly Heterogeneous Photocatalysis on Biochar-Based Materials Under Solar Irradiation

Matos

2015

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Clean energy production and environmental remediation on carbon-based photocatalysts are shown in this work. Firstly, Au-supported on nanoporous biocharbased materials were prepared and used for hydrogen photoproduction under visible light irradiation. In presence of biochars, the photocatalytic activity increased by a factor up to 3 times higher than that obtained on a neat commercial semiconductor. In second place, the photocatalytic activity of S-and N-doped carbons was verified in the methylene blue photodegradation under artificial solar irradiation. Normalizing the kinetic results in terms of the weight of samples, the present results showed an increase in the photocatalytic activity up to 30 and 5 times higher on S-and N-doped biochars, respectively, than that obtained on a commercial semiconductor. The present results suggest that micropores in carbon materials play the role of microreactors and therefore harvesting solar energy for environmental remediation and clean energy production is possible by using free-semiconductor biochar-based materials.

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“…A screening is conducted on the raw coal with the dry air in accordance with GB/T477-2008, after which the coal sample of [6][7][8][9][10][11][12][13] （mm） is oscillated in line with the above standard and classified with degrees of density. The density of the sample is set below 0.2 mm to be used for a test after the drying at a constant temperature of 105 o C. The industrial and elemental analysis of the sample of different degrees of density is shown in Table 1.…”

Section: Raw Materials and Reagentmentioning

confidence: 99%

“…There are also different opinions with regard to the groups they fall into. GRZYBEK T holds that 532.75eV and 532.8eV are defined as the double-key attribute peak of carbon oxygen(C-O) and the mono-key attribute peak of carbon oxygen(C-O) [13] while GARDNER S D holds the opposite opinion [14] . WATN ER C D maintains that the electronic binding position of the double-key attribute peak of carbon oxygen(C-O) is 531.6eV while that of the mono-key attribute peak of carbon oxygen(C-O) is 533.3eV [15] .…”

Section: The Occurrence Shape Of Oxygen In the Coal Surface Texturementioning

confidence: 99%

The XPS Analysis of Surface Texture of Different-Density-Level Coking Coal of Fenxi County

Ge¹

2014

OGCE

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Abstract:In the present paper, X-ray photoelectron spectrum (XPS) is used to reveal the surface texture, main elements and occurrence mode of different-density-level sample coal of Fenxi County. The experimental results demonstrate that: (1) there is an extremely low content of nitrogen in the sample coal; (2) carbon mainly exists in the form of C-C and the contents of carbonyl (C=O) and carboxyl is still relatively low; (3) with the increasing of density, such content has a growing trend; (4) the organic sulfur of the coking coal in Fenxi County has the three major forms, i.e., （sub） sulfone, thiophene and thiol (ether), with their respective content in a low-to-high order.

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X-ray photoelectron spectroscopy study of oxidized coals with different sulphur content

Cited by 151 publications

References 6 publications

Studies of the soluble part of oxidised coals

Studies of the soluble part of oxidised coals

Eco-Friendly Heterogeneous Photocatalysis on Biochar-Based Materials Under Solar Irradiation

The XPS Analysis of Surface Texture of Different-Density-Level Coking Coal of Fenxi County

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