Changes of nitrogen forms during pyrolysis of coal and an effect of iron loaded on coal
- Chinese Academy of Sciences, Taiyuan, Shanxi (China). State Key Lab. of Coal Conversion
The nitrogen-containing compound in coal is one of fuel NO{sub x} sources that cause pollution. It is essential for environmental protection to removing the nitrogen prior to combustion. An understanding of the chemistry of organically bound nitrogen in coal is advantageous to this objective and can provide valuable insight into the organic macromolecule structure. Direct spectroscopy methods, such as X-ray photoelectron spectroscopy (XPS) and x-ray absorption near-edge structure spectroscopy (XANES), have been proven to be viable non-destructive techniques for organic nitrogen forms in nonvolatile and solid carbonaceous materials. Previous studies established that the N1s XPS spectra of coal could be curve resolved into two major components, pyrrolic and pyridinic. In recent XPS studies of nitrogen in coal, pyrrolic and pyridinic are identified as major forms, and quaternary nitrogen presents at higher binding energy, in particular in the low rank coals. Kelemen et al. reported that the relative amount of quaternary nitrogen forms decreases while the relative amount of pyridinic nitrogen increases after coal pyrolysis and hydropyrolysis. In the present paper, the distribution and chemical changes of nitrogen forms in demineralized coals during pyrolysis were studied by XPS technique, and an effect of iron loaded on coals upon the changes was also examined.
- OSTI ID:
- 257145
- Report Number(s):
- CONF-950952--
- Country of Publication:
- United States
- Language:
- English
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