The use of step scan FT/IR/PAS for the study of structural changes in coal and char particles during gasification

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370292

Yamada, O; Yasuda, H; Soneda, Y ^[1]

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1. National Inst. for Resources and Environment, Tsukuba (Japan)

Step scan FT-IR/photoacoustic spectroscopy (PAS) was used for depth profiling of coal and gasification char particles. Phase modulation on the interferometer and phase separation at the detector. by a lock-in amplifier, and a variety of modulation frequencies and phase angles were used. The results showed considerably different spectra with depth of the coal. Sampling depth was estimated to ca 10 {mu}m by comparing the depth profiling spectra and cross-sectional microscopic observation of oxidized coal. Changes in the functional groups of gasification chars obtained from various conditions including the Japanese HYCOL gasifier were measured by step scan FT-IR. The surface of all chars was completely carbonized and no peaks were detected using conventional FT-IR techniques. However, in the depth profiling spectra, peaks at around 2900 cm{sup -1} and also at around 1600 cm{sup -1} were clearly detected at deeper layers of the char particles, indicating the existence of an organic structure.

• OSTI ID: 370292
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHARS
COAL
COAL GASIFICATION
LAYERS
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
PHOTOACOUSTIC SPECTROSCOPY