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http://dx.doi.org/10.7316/KHNES.2016.27.5.517

Deactivation Behavior of K2CO3 Catalyst in the Steam Gasification of Kideco Coal  

VICTOR, PAUL (Clean Fuel Laboratory, Korea Institute of Energy Research)
KIM, SOOHYUN (Clean Fuel Laboratory, Korea Institute of Energy Research)
YOO, JIHO (Clean Fuel Laboratory, Korea Institute of Energy Research)
LEE, SIHYUN (Clean Fuel Laboratory, Korea Institute of Energy Research)
RHIM, YOUNGJOON (Clean Fuel Laboratory, Korea Institute of Energy Research)
LIM, JEONGHWAN (Clean Fuel Laboratory, Korea Institute of Energy Research)
KIM, SANGDO (Clean Fuel Laboratory, Korea Institute of Energy Research)
CHUN, DONGHYUK (Clean Fuel Laboratory, Korea Institute of Energy Research)
CHOI, HOKYUNG (Clean Fuel Laboratory, Korea Institute of Energy Research)
RHEE, YOUNGWOO (Graduate School of Energy Science & Technology, Chungnam National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.27, no.5, 2016 , pp. 517-525 More about this Journal
Abstract
The present work investigates the effect of $K_2CO_3$ catalyst on steam gasification of Kideco coal and the deactivation of the catalyst due to thermal exposure and interaction with coal ash. The gasification reactivity at $700^{\circ}C$ is highly enhanced by $K_2CO_3$, which is not deactivated by the heat treatment at $T{\leq}800^{\circ}C$. TGA and XRD results prove minor decomposition of $K_2CO_3$ after the calcination at $800^{\circ}C$. $K_2CO_3$ is, however, evaporated at the higher temperature. Assuming the conversion of $K_2CO_3$ into $K_2O$ by the decomposition and into $K_2O{\cdot}2.5SiO_2$ and $KAlO_2$ by the interaction with coal ash, the reactivity of the gasification is evaluated in the presence of $K_2O$, $K_2O{\cdot}2.5SiO_2$ and $KAlO_2$. Among them, $K_2O$ is the most active, but much lower in the activity than $K_2CO_3$. XRD results show that $K_2CO_3$ could react readily with the ash above $700^{\circ}C$.
Keywords
Steam gasification; Catalyst; Coal; Deactivation; Potassium;
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