Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7719050 | International Journal of Hydrogen Energy | 2014 | 9 Pages |
Abstract
Catalytic gasification of raw coals at mild condition is not realized yet mainly due to deactivation of catalysts via their irreversible interaction with mineral matters in coal. As a means to achieve repeated use of catalysts, four different ash-free coals (AFCs) containing less than 0.2 wt% ash are produced in this work. Steam gasification of ash-free coals (AFCs) and their parent raw coals of various ranks ranging from lignite (Eco) to coking coal (Posco) is performed in a fixed bed reactor at 700-900 °C. Regardless of the rank of the parent raw coals, all the AFCs behave like a highly carbonized coal such that their gasification rate are similarly slow and they exhibit relatively low H2/CO ratio. The steam gasification and associated CO to CO2 conversion of the AFCs are, however, significantly enhanced by K2CO3, resulting in the higher H2/CO and CO2/CO molar ratio.
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Authors
Yongjin Kong, Jaekwon Kim, Donghyuk Chun, Sihyun Lee, Youngjoon Rhim, Jeonghwan Lim, Hokyung Choi, Sangdo Kim, Jiho Yoo,