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.

scholarly journals The effect of preparation method on the performance of PtSn/Al2O3 catalysts for acetic acid hydrogenation

2015 ◽  
Vol 17 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Ke Zhang ◽  
Haitao Zhang ◽  
Hongfang Ma ◽  
Weiyong Ying ◽  
Dingye Fang
Keyword(s):  
Acetic Acid ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Preparation Method ◽  
Chemical Properties ◽  
Temperature Programmed Reduction ◽  
Commercial Alumina ◽  
X Ray ◽  
Temperature Programmed

Abstract PtSn/Al2O3 catalysts with a given loading of 1 wt% Pt and 1 wt% Sn were prepared by co-impregnation or successive impregnation with aqueous solutions of Pt, Sn precursors and a commercial alumina. The catalysts were characterized by N2 adsorption, H2-TPR (H2 temperature-programmed reduction), H2-pulse chemisorption, XPS (X-ray photoelectron spectroscopy) and CO-FTIR (Fourier transform infrared spectroscopy), and tested in the hydrogenation of acetic acid. The results showed that the preparation method affected both the chemical properties and their performance in the hydrogenation of acetic acid. Sn enrichment on the catalysts surface was observed on the co-impregnated catalyst and catalyst in which the Pt precursor had been loaded first. It was found that the modification of Pt was a function of the sequence of Sn addition as revealed by CO-FTIR. Co-impregnated catalyst showed the highest activity and ethanol selectivity.

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

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
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