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Proceeding from the knowledge of the functional forms of nitrogen in coals it should be possible to draw conclusions on the mechanisms of its release during devolatilization. Pyrolysis experiments were carried out with a series of lignite from the main German mining districts in a temperature range from 673 to 1173K. Nitrogen functionalities of the coals and the obtained chars were determined by XPS...
Pyrolysis experiments were carried out with polymeric model compounds containing defined forms of bound nitrogen. The chosen compounds, polyvinylcarbazole, polyvinylpyridine and polyvinylpyrrolidone, were pyrolysed in a fixed bed annular reactor at 873 and 1173 K. The functionalities of the nitrogen in the precursors as well as that in the derived chars were determined by X-ray photoelectron spectroscopy...
We present the first comparative analysis of spectral data obtained at low temperatures with three different highly selective techniques: two-pulse photon echo (2PE), hole-burning (HB) and single-molecule spectroscopy (SMS) of a polyisobutylene glass (PIB) doped with tetra-tert-butylterrylene (TBT). Our 2PE- and HB-experiments are compared with literature data [Tittel et al., J. Lumin. 64 (1995) 1]...
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