Atmospheric-Pressure Temperature-Programmed Reduction Study of High-Sulfur Coals Reduced in a Potassium/Liquid Ammonia System

1998 ◽  
Vol 12 (6) ◽  
pp. 1142-1147 ◽  
Author(s):  
Mieczysław Kozłowski ◽  
Helena Wachowska ◽  
Jan Yperman ◽  
Dirk V. Franco ◽  
Jules Mullens ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Liquid Ammonia ◽  
Temperature Programmed Reduction ◽  
Temperature Programmed

scholarly journals Composition of extraction products from alkylated high-sulphur coals

2003 ◽  
Vol 1 (4) ◽  
pp. 366-386 ◽  
Author(s):  
Mieczysław Kozłowski ◽  
Helena Wachowska ◽  
Jan Yperman
Keyword(s):  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Atmospheric Pressure ◽  
Liquid Ammonia ◽  
Temperature Programmed Reduction ◽  
Reductive Methylation ◽  
Aliphatic Compounds ◽  
Low Degree ◽  
Temperature Programmed ◽  
Degree Of Condensation

AbstractProducts of reductive and non-reductive methylation of two high-sulphur coals (Mequinenza and Illinois No. 6) have been extracted by dichloromethane. It has been established that the efficiency of the transformation of coal to the products soluble in CH2Cl2 is higher for coals subjected to non-reductive methylation by the Liotta method than for those after reduction in the potassium/liquid ammonia system. The extracts and the extraction residues were subjected to elemental analysis, IR spectroscopy, and AP-TPR (Atmospheric Pressure-Temperature Programmed Reduction) measurements. It has been shown that the main species undergoing extraction by CH2Cl2 are aliphatic compounds or aromatic structures of low degree of condensation. The effect of the extraction on the sulphur groups in coal has been discussed.

Study of Coal-Derived Pyrite and Its Conversion Products Using Atmospheric Pressure Temperature-Programmed Reduction (AP-TPR)

1995 ◽  
Vol 9 (6) ◽  
pp. 950-955 ◽  
Author(s):  
Inge I. Maes ◽  
Jan Yperman ◽  
Heidi Van den Rul ◽  
Dirk V. Franco ◽  
Jules Mullens ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Temperature Programmed Reduction ◽  
Temperature Programmed

Study of sulphur in oxidised coals by atmospheric pressure-temperature programmed reduction

2004 ◽  
Vol 75 (1) ◽  
pp. 125-134 ◽  
Author(s):  
M. Kozlowski ◽  
R. Pietrzak ◽  
H. Wachowska ◽  
J. Yperman
Keyword(s):  
Atmospheric Pressure ◽  
Temperature Programmed Reduction ◽  
Temperature Programmed

scholarly journals Studies of the soluble part of oxidised coals

2004 ◽  
Vol 2 (2) ◽  
pp. 278-289 ◽  
Author(s):  
Robert Pietrzak ◽  
Mieczysław Kozłowski ◽  
Helena Wachowska ◽  
Jan Yperman
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Nitric Acid ◽  
Atmospheric Pressure ◽  
Temperature Programmed Reduction ◽  
Sulphur Compounds ◽  
Inorganic Sulphur ◽  
Temperature Programmed ◽  
Sulphur Species ◽  
Soluble Part

AbstractSoluble 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 Infrared Spectroscopy (FTIR). The soluble products contain much more sulphur than the insoluble products of oxidation. The products obtained from the reaction with HNO3 contain higher amounts of inorganic sulphur compounds, while those obtained from the reaction with PAA are characterised by an increased content of organic sulphur species.

Sulphur group analysis in solid matrices by atmospheric pressure-temperature programmed reduction

1999 ◽  
Vol 395 (1-2) ◽  
pp. 143-155 ◽  
Author(s):  
Jan Yperman ◽  
Inge I. Maes ◽  
Heidi Van den Rul ◽  
Steven Mullens ◽  
Joke Van Aelst ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Group Analysis ◽  
Temperature Programmed Reduction ◽  
Solid Matrices ◽  
Temperature Programmed
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