Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on the CO2 Methanation in Power to Gas (P2G) over Ni-Catalysts

Ni 촉매 상에서 Power to Gas (P2G) 기술의 CO2 메탄화 반응에 관한 연구

  • YEOM, GYUIN (Department of Environment-Energy Engineering, The University of Suwon) ;
  • SEO, MYUNGWON (Korea Institute of Energy Research) ;
  • BAEK, YOUNGSOON (Department of Environment-Energy Engineering, The University of Suwon)
  • 염규인 (수원대학교 환경에너지공학과) ;
  • 서명원 (한국에너지기술연구원) ;
  • 백영순 (수원대학교 환경에너지공학과)
  • Received : 2019.01.27
  • Accepted : 2019.02.28
  • Published : 2019.02.28
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Abstract

The power to gas (P2G) is one of the energy storage technologies that can increase the storage period and storage capacity compared to the existing battery type. One of P2G technologies produces hydrogen by decomposing water from renewable energy (electricity) and the other produces $CH_4$ by reacting hydrogen with $CO_2$. The objective of this study is the reaction of $CO_2$ methanation which synthesized methane by reacting carbon dioxide and hydrogen. The effect of $CO_2$ conversion and $CH_4$ selectivity on reaction temperature, pressure, and methane contents over 40% Ni catalyst was mainly investigated throughout this study. As a result, the activity of this catalyst appeared to be the highest in $CH_4$ yield at around $400^{\circ}C$ and the selectivity of $CH_4$ increased with increasing reaction pressure. The methane content was not significantly influenced below 3% of all componets. As the space velocity increases from 10,000 to 30,000/hr, the $CO_2$ conversion rate tends to decrease.

Keywords

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Fig. 1. Block diagram for production process of Ni-catalyst for CO2 methanation

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Fig. 2. Experimental apparatus for CO2 methanation

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Fig. 3. XRD pattern of Ni-Mg-Al catalyst with Ni amount

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Fig. 4. H2-TPR pattern of Ni-Mg-Al catalyst with Ni amount

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Fig. 5. Effect of reaction temperature on CO2 conversion and CH4 selectivity over 40% Ni-catalyst

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Fig. 6. Effect of methane on CO2 conversion and CH4 selectivity over 40% Ni-catalyst at 400℃

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Fig. 7. Effect of pressure on CO2 conversion and CH4 selectivity over 40% Ni-catalyst at 400℃

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Fig. 8. Effect of GHSV on CO2 conversion and CH4 selectivity at 400℃

Table 1. Reaction conditions for CO2 methanation

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Table 2. Specific surface area and pore volume with loading Nickel amount before reduction

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