3-23.高含水バイオマスの油中改質におけるカルシウム触媒の担持形態とそのチャーのガス化反応速解析((5)ガス化5,Session 3 バイオマス等)

概要

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Coffee grounds with high moisture have been loaded with different Ca(OH)_2 contents during slurry dehydrating process. The concentration and dispersion state of calcium in the dehydrated grounds and/or their pyrolytic chars were analyzed by using atomic absorption spectroscopy, scanning electron microscope and energy dispersive spectrometer (SEM-EDS), and X-ray diffraction (XRD). Gasification reactivities of the chars were determined under isothermal conditions using a thermogravimetric analyzer. It was found that reactivities increased with Ca(OH)_2 content up to a saturation level (SL) of about 4wt%, above which the reactivities were constant. The different catalytic activities of calcium were interpreted as being due to its desperation state. For loading content lower than SL, Ca(OH)_2 highly dispersed to matrix without crystallization, whereas the excess addition led to the formation of the crystallized structure, and therefore had no additional catalytic activity.
一般社団法人日本エネルギー学会の論文
2006-08-03