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The physical character of coal char formed during rapid pyrolysis at high pressure |
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| Authors: | Koichi Matsuoka Hiroyuki Akiho Rajender Gupta Akira Tomita |
| Affiliation: | a Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan b Institute of Research and Innovation, 1201 Takada, Kashiwa 277-0861, Japan c Cooperative Research Center for Coal in Sustainable Development, Department of Chemical Engineering, School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia |
| Abstract: | Rapid pyrolysis was conducted in a drop tube reactor using seven coals under various operating conditions. In addition to dense char, porous chars (network char and cenospheric char) were formed by the rapid pyrolysis under certain conditions. Porous char was mainly composed of film-like carbon and skeleton carbon. The pyrolyzed coal char particles were characterized in detail. Morphology and bulk density of porous char were quite different from the dense char formed under the same conditions, but elemental composition and BET surface area were similar to each other. CO2 gasification reactivity of porous char was lower than dense char in the later gasification stage, and this was ascribed to the low reactivity of skeleton carbon. |
| Keywords: | Coal Char Pyrolysis Cenosphere Morphology |
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