Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Deactivation Behavior of K2CO3 Catalyst in the Steam Gasification of Kideco Coal

Kideco 석탄의 스팀 가스화 반응에서 K2CO3 촉매의 비활성화 거동

  • 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)
  • ;
  • 김수현 (한국에너지기술연구원 청정연료연구실) ;
  • 유지호 (한국에너지기술연구원 청정연료연구실) ;
  • 이시훈 (한국에너지기술연구원 청정연료연구실) ;
  • 임영준 (한국에너지기술연구원 청정연료연구실) ;
  • 임정환 (한국에너지기술연구원 청정연료연구실) ;
  • 김상도 (한국에너지기술연구원 청정연료연구실) ;
  • 전동혁 (한국에너지기술연구원 청정연료연구실) ;
  • 최호경 (한국에너지기술연구원 청정연료연구실) ;
  • 이영우 (충남대학교 에너지과학기술대학원)
  • Received : 2016.09.13
  • Accepted : 2016.10.30
  • Published : 2016.10.30
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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 $700^{\circ}C$.

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