Effect of mild oxidation on the surface chemistry of bituminous coals under different humidity conditions

M.F. Vega; B. Acevedo; E. Díaz-Faes; C. Barriocanal

doi:10.1016/j.coal.2017.06.001

Effect of mild oxidation on the surface chemistry of bituminous coals under different humidity conditions

M.F. Vega, B. Acevedo, E. Díaz-Faes, C. Barriocanal

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Abstract

The influence of humidity conditions on the oxidation of four coals has been studied on the basis of their surface chemistry. A systematic study was carried out in which four coals of different rank were oxidised at 50 °C in two conditions of humidity (20 and 90% moisture levels) and in an air atmosphere. The changes in the surface functional groups were measured by means of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and X-ray photoelectron spectroscopy (XPS).

The lowest rank coals were the most affected by oxidation in all the humidity conditions applied. In the case of the higher rank coals, higher moisture levels promoted the oxidation process. The number of oxygen-containing structures increased after oxidation, the most abundant being the carbonyl and carboxyl groups.

Original language	English
Pages (from-to)	164–172
Journal	International Journal of Coal Geology
Volume	179
Early online date	8 Jun 2017
DOIs	https://doi.org/10.1016/j.coal.2017.06.001
Publication status	Published - 15 Jun 2017

Keywords

Bituminous coal
Oxidation
Surface chemistry
XPS

Access to Document

10.1016/j.coal.2017.06.001

Accepted manuscriptAccepted author manuscript, 681 KBLicence: CC BY-NC-ND

http://www.sciencedirect.com/science/article/pii/S0166516217301040

Cite this

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title = "Effect of mild oxidation on the surface chemistry of bituminous coals under different humidity conditions",

abstract = "The influence of humidity conditions on the oxidation of four coals has been studied on the basis of their surface chemistry. A systematic study was carried out in which four coals of different rank were oxidised at 50 °C in two conditions of humidity (20 and 90% moisture levels) and in an air atmosphere. The changes in the surface functional groups were measured by means of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and X-ray photoelectron spectroscopy (XPS). The lowest rank coals were the most affected by oxidation in all the humidity conditions applied. In the case of the higher rank coals, higher moisture levels promoted the oxidation process. The number of oxygen-containing structures increased after oxidation, the most abundant being the carbonyl and carboxyl groups.",

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T1 - Effect of mild oxidation on the surface chemistry of bituminous coals under different humidity conditions

AU - Vega, M.F.

AU - Acevedo, B.

AU - Díaz-Faes, E.

AU - Barriocanal, C.

PY - 2017/6/15

Y1 - 2017/6/15

N2 - The influence of humidity conditions on the oxidation of four coals has been studied on the basis of their surface chemistry. A systematic study was carried out in which four coals of different rank were oxidised at 50 °C in two conditions of humidity (20 and 90% moisture levels) and in an air atmosphere. The changes in the surface functional groups were measured by means of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and X-ray photoelectron spectroscopy (XPS). The lowest rank coals were the most affected by oxidation in all the humidity conditions applied. In the case of the higher rank coals, higher moisture levels promoted the oxidation process. The number of oxygen-containing structures increased after oxidation, the most abundant being the carbonyl and carboxyl groups.

AB - The influence of humidity conditions on the oxidation of four coals has been studied on the basis of their surface chemistry. A systematic study was carried out in which four coals of different rank were oxidised at 50 °C in two conditions of humidity (20 and 90% moisture levels) and in an air atmosphere. The changes in the surface functional groups were measured by means of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and X-ray photoelectron spectroscopy (XPS). The lowest rank coals were the most affected by oxidation in all the humidity conditions applied. In the case of the higher rank coals, higher moisture levels promoted the oxidation process. The number of oxygen-containing structures increased after oxidation, the most abundant being the carbonyl and carboxyl groups.

KW - Bituminous coal

KW - Oxidation

KW - Surface chemistry

KW - XPS

U2 - 10.1016/j.coal.2017.06.001

DO - 10.1016/j.coal.2017.06.001

M3 - Article

VL - 179

SP - 164

EP - 172

JO - International Journal of Coal Geology

JF - International Journal of Coal Geology

SN - 0166-5162

ER -