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AIR OXIDATION OF TURKISH BEYPAZARI LIGNITE .1. CHANGE OF STRUCTURAL CHARACTERISTICS IN OXIDATION REACTIONS AT 150-DEGREES-C
Date
1993-05-01
Author
AZIK, M
YURUM, Y
GAINES, AF
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The oxidation of Beypazari lignite was carried out in air at 150-degrees-C for up to 168 h. Oxidized samples were withdrawn from a ventilated oven at different periods of time and characterized by elemental analysis, diffuse reflectance Fourier transform infrared (DRIFT), solid-state C-13 CP/MAS/TOSS NMR, and pyrolysis mass (Py-MS) spectroscopies. It was found that oxidation influenced the organic structure and the inorganics at different periods of the oxidation. Iron(II) sulfate was formed in 24 h, during which time there was almost no change of aliphatic CH2 and CH3 groups. After the formation of iron(II) sulfate, aliphatic CH2 and CH3 groups started to oxidize. Thus, the formation of iron(II) sulfate apparently prevented the oxidation of organic structure of Beypazari lignite during the first 24 h. The van Krevelen diagram (H/C vs O/C), the change of the O/H atomic ratio, and the rate of loss of aliphatic CH2 and CH3 groups showed the organic structure of Beypazari lignite to have continued in three stages. Aromatics seemed to be more stable than aliphatics during the oxidation process. The functional groups produced by the oxidation included ketones, carboxyls, and anhydrides but the major oxidation products were aryl esters. The abundance of CO2+, CO+, CH3COOH+, and SO2+ molecular ions increased in the pyrolysate of the oxidized sample whereas the molecular ions alkylphenols, dihydroxybenzenes, and alklynaphthalenes decreased after the oxidation.
Subject Keywords
Fuel Technology
,
Energy Engineering and Power Technology
,
General Chemical Engineering
URI
https://hdl.handle.net/11511/66816
Journal
ENERGY & FUELS
DOI
https://doi.org/10.1021/ef00039a006
Collections
Graduate School of Marine Sciences, Article
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AZIK, M; YURUM, Y; GAINES, AF (American Chemical Society (ACS), 1994-01-01)
Demineralized (HCl/HF) samples of Beypazari lignite were oxidized in air at 150 degrees C for up 120 h in a ventilated oven. Elemental analyses, diffuse reflectance Fourier transform infrared (DRIFT), solid-state C-13 CP/MAS/TOSS NMR, and pyrolysis mass (PY-MS) spectroscopies as well as solvent swelling were used for the characterization of the oxidized and unoxidized samples. It was found that the removal of 90.1% of the mineral matter from Beypazari lignite facilitated the access of oxygen into the coal s...
AIR OXIDATION OF TURKISH BEYPAZARI LIGNITE .3. CHANGE IN THE STRUCTURAL CHARACTERISTICS OF THE RESIDUE IN OXIDATION REACTIONS AT 150-DEGREES-C
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Beypazari lignite was subsequently demineralized with HCl/HF and extracted by pyridine under supercritical conditions. The extracted residue was oxidized in air at 150-degrees-C for up to 120 h in a ventilated oven. Elemental analysis, diffuse reflectance Fourier transform infrared (DRIFT), solid-state C-13 CP/MAS/TOSS NMR, and pyrolysis mass (Py-MS) spectroscopic techniques were used for the structural characterization of the oxidized and unoxidized samples. It was found that the oxidation of the extracted...
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M. AZIK, Y. YURUM, and A. GAINES, “AIR OXIDATION OF TURKISH BEYPAZARI LIGNITE .1. CHANGE OF STRUCTURAL CHARACTERISTICS IN OXIDATION REACTIONS AT 150-DEGREES-C,”
ENERGY & FUELS
, pp. 367–372, 1993, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66816.