Abstract
To understand the reactions occur during coal gasification, it is essential to investigate reactivity and structural changes in coal and char. As coal and char are solid which hardly dissolve into most of solvents, variety of applicable methods for analyses is limited. An FT-IR spectroscopy is a promising method to detect the status of various kinds of functional groups and their chemical and physical changes. Recently, FT-IR photoacoustic spectroscopy (FT-IR/PAS) of coal has been intensively studied. Depth profiling analyses using FT-IR/PAS is also discussed focusing on the technique to avoid a saturation of the photoacoustic signal. In this paper, a step scan FT-IR/PAS with a phase modulation was applied to depth profiling of coal particles whose surfaces were treated by oxidation and ion-irradiation to elucidate a sampling depth. Depth profile of gasification char particles obtained from HYCOL entrained flow type gasifier were analyzed by step scan FT-IR/PAS.
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