Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Carbon-Encapsulated Ni Catalysts for CO2 Methanation

탄소층으로 캡슐화된 Ni나노입자 촉매의 CO2 메탄화 반응

  • Kim, Hye Jeong (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kim, Seung Bo (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kim, Dong Hyun (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Youn, Jae-Rang (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kim, Min-Jae (Energy Resources Upcycling Research Laboratory, Korea Institute of Energy Research) ;
  • Jeon, Sang Goo (Energy Resources Upcycling Research Laboratory, Korea Institute of Energy Research) ;
  • Lee, Gyoung-Ja (Smart Structural Safety and Prognosis Research Division, Korea Atomic Energy Research Institute) ;
  • Lee, Kyubock (Graduate School of Energy Science and Technology, Chungnam National University)
  • 김혜정 (충남대학교 에너지과학기술대학원) ;
  • 김승보 (충남대학교 에너지과학기술대학원) ;
  • 김동현 (충남대학교 에너지과학기술대학원) ;
  • 윤재랑 (충남대학교 에너지과학기술대학원) ;
  • 김민재 (한국에너지기술연구원 에너지자원순환연구실) ;
  • 전상구 (한국에너지기술연구원 에너지자원순환연구실) ;
  • 이경자 (한국원자력연구원 스마트안전진단연구부) ;
  • 이규복 (충남대학교 에너지과학기술대학원)
  • Received : 2021.08.13
  • Accepted : 2021.09.07
  • Published : 2021.09.27
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Abstract

Carbon-encapsulated Ni catalysts are synthesized by an electrical explosion of wires (EEW) method and applied for CO2 methanation. We find that the presence of carbon shell on Ni nanoparticles as catalyst can positively affect CO2 methanation reaction. Ni@5C that is produced under 5 % CH4 partial pressure in Ar gas has highest conversions of 68 % at 350 ℃ and 70 % at 400 ℃, which are 73 and 75 % of the thermodynamic equilibrium conversion, respectively. The catalyst of Ni@10C with thicker carbon layer shows much reduced activity. The EEW-produced Ni catalysts with low specific surface area outperform Ni catalysts with high surface area synthesized by solution-based precipitation methods. Our finding in this study shows the possibility of utilizing carbon-encapsulated metal catalysts for heterogeneous catalysis reaction including CO2 methanation. Furthermore, EEW, which is a highly promising method for massive production of metal nanoparticles, can be applied for various catalysis system, requiring scaled-up synthesis of catalysts.

Keywords

Acknowledgement

This work was supported by research fund of Chungnam National University.

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