Results
author = "YPERMAN, Jan"
Reductive pyrolysis study of sulfur compounds in different Tabas coal samples (Iran)
Description :
A comparative study of the effects of mineral and pyrite removal on the determination of organic sulfur functionalities in representative, as well as its low and high sulfur analogue samples of Tabas coal (Cl seam) were studied by atmospheric pressure-temperature-programmed reduction (AP-TPR) method...
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Study on hydrodechlorination of polychlorinated biphenyls during reductive pyrolysis in the presence of a catalyst
Description :
For the first time an experimental set-up, called atmospheric pressure temperature programmed reduction (AP-TPR) applied in the speciation study of sulphur compounds in coal, has been used in the hydrodechlorination study of polychlorinated biphenyls (PCBs) with several specifically designed catalys...
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English
Sulfur analysis of Bolu-Mengen lignite before and after microbiological treatment using reductive pyrolysis and gas chromatography/mass spectrometry
Description :
Atmospheric pressure-temperature programmed reduction coupled with on-line mass spectrometry (AP-TPR/MS) is used for the first time on microbiologically treated coal samples as a technique to monitor the degree of desulfurization of the various sulfur functionalities. The experimental procedure enab...
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English
Studies of the soluble part of oxidised coals
Description :
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-Temperatu...
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English
Study of sulphur in oxidised coals by atmospheric pressure-temperature programmed reduction
Description :
The influence of oxidation of coal, performed with different oxidising agents, on the sulphur species was studied. Conversions of the sulphur species were investigated by the Atmospheric Pressure - Temperature Programmed Reduction method (AP - TPR). The removal of pyrite proved to be advantageous fo...
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English
Low rank coals sulphur functionality study by AP-TPR/TPO coupled with MS and potentiometric detection and by XPS
Description :
Atmospheric pressure-temperature programmed reduction (AP-TPR) and X-ray photoelectron spectroscopy (XPS) techniques were applied to low rank coals sulphur study. Coal samples were pyrolysed in a flow of water vapor (WV). It was demonstrated that this treatment influenced mainly aliphatic sulphur. S...
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English
Study on organic sulfur functionalities of pyridine extracts from coals of different rank using reductive pyrolysis
Description :
The organic sulfur functionalities in the pyridine extracts obtained from lignite (lignite A), subbituminous coal (subA), and bituminous coal (mvb) were studied by atmospheric pressure-temperature-programmed reduction (AP-TPR) method. The extraction yield was in the range of 6.7-29.3 wt % with a max...
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English
AP-TPR investigation of the effect of pyrite removal on the sulfur characterization of different rank coals
Description :
The effect of pyrite removal on the determination of organic sulfur functionalities of different rank coals by atmospheric pressure-temperature-programmed reduction (AP-TPR) method was studied. The nitric acid treatment and sink-float separation were performed to reduce the content of pyritic sulfur...
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English
AP-TPR study of sulphur in coals subjected to mild oxidation. Part 1. Demineralised coals
Description :
Five samples of coal characterised by different degree of coalification and different content of sulphur have been subjected to oxidation in the dry phase and in aqueous media in order to determine the effect of oxidation on the sulphur groups. The transformations were studied by the classical chemi...
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Silver(I) complex formation with 1,4-diaminobutane and 1,5-diaminopentane: A potentiometric study in 1.0 m KNO3
Description :
By means of potenriometric pH measurements, the acidity constants of 1,4-diaminobutane and 1,5-diaminopentane have been determined in 1.0 M KNO3 at 25.0 degrees C. Combined pH/pAg data were used at the same temperature in aqueous 1.0 M KNO3 to study the complexation of Ag(I) with the diamines. Proto...
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Language(s) :
English