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http://dx.doi.org/10.7464/ksct.2014.20.3.218

Comparative Studies on K2CO3-based Catalytic Gasification of Samhwa Raw Coal and Its Ash-free Coal  

Kong, Yongjin (Clean Fuel Department, Korea Institute of Energy Research)
Lim, Junghwan (Clean Fuel Department, Korea Institute of Energy Research)
Rhim, Youngjoon (Clean Fuel Department, Korea Institute of Energy Research)
Chun, Donghyuk (Clean Fuel Department, Korea Institute of Energy Research)
Lee, Sihyun (Clean Fuel Department, Korea Institute of Energy Research)
Yoo, Jiho (Clean Fuel Department, Korea Institute of Energy Research)
Rhee, Young-Woo (Graduate school of Engergy Science and Technology, Chungnam National University)
Publication Information
Clean Technology / v.20, no.3, 2014 , pp. 218-225 More about this Journal
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. In this work, the gasification behavior of ash-free coal (AFC) was compared with that of the parent raw coal. In order to modify the gasification conditions, the raw coal gasified with fixed variables (water supply, space velocity, temperature, catalysts) in a fixed bed reactor. When catalysts are added by physical mixing method with coal, $K_2CO_3$ was the most effective additives for steam gasification of coal. However, the activity of ash-free coal (AFC) was much less reactive than raw coal due to high temperature extraction in a 1-methylnaphthalene under 30bar at $370^{\circ}C$ for 1 h, almost removed oxygen functional groups, and increased carbonization. The addition of $K_2CO_3$ in AFC achieved higher conversion rate at low temperature ($700^{\circ}C$). At that time, the molar ratio of gases ($H_2/CO$ and $CO_2/CO$) was increased because of water-gas shift reaction (WGSR) by addition of catalysts. This shows that catalytic steam gasification of AFCs is achievable for economic improvement of gasification process at mild temperature.
Keywords
Coal gasification; Ash-free coal; Coal; Catalytic gasification; $K_2CO_3$;
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Times Cited By KSCI : 1  (Citation Analysis)
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