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

  • 제30권3호
  • /
  • Pages.220-226
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  • 2019
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  • 1738-7264(pISSN)
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  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
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수소저장용 Mg-CaO-10 wt.% MWCNT 복합체의 물질 전과정 평가

Material Life Cycle Assessment of Mg-CaO-10 wt.% MWCNT Hydrogen Storage Composites

  • 한정흠 (한국교통대학교 화공신소재고분자공학부 신소재공학전공) ;
  • 이영환 (한국교통대학교 화공신소재고분자공학부 신소재공학전공) ;
  • 유제선 (한국교통대학교 화공신소재고분자공학부 신소재공학전공) ;
  • 홍태환 (한국교통대학교 화공신소재고분자공학부 신소재공학전공)
  • HAN, JEONG-HEUM (Department of Materials Science & Engineering, Korea National University of Transportation) ;
  • LEE, YOUNG-HWAN (Department of Materials Science & Engineering, Korea National University of Transportation) ;
  • YU, JAE-SEON (Department of Materials Science & Engineering, Korea National University of Transportation) ;
  • HONG, TAE-WHAN (Department of Materials Science & Engineering, Korea National University of Transportation)
  • 투고 : 2019.05.30
  • 심사 : 2019.06.30
  • 발행 : 2019.06.30
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초록

Magnesium hydride has a high hydrogen storage capacity (7.6 wt.%), and is cheap and lightweight, thus advantageous as a hydrogen storage alloy. However, Mg-based hydrides undergo hydrogenation/dehydrogenation at high temperature and pressure due to their thermodynamic stability and high oxidation reactivity. MWCNTs exhibit prominent catalytic effect on the hydrogen storage properties of $MgH_2$, weakening the interaction between Mg and H atoms and reducing the activation energy for nucleation of the metal phase by co-milling Mg with carbon nanotubes. Therefore, it is suggested that combining transition metals with carbon nanotubes as mixed dopants has a significant catalytic effect on the hydrogen storage properties of $MgH_2$. In this study, Material life cycle evaluation was performed to analyze the environmental impact characteristics of Mg-CaO-10 wt.% MWCNTs composites manufacturing process. The software of material life cycle assessment (MLCA) was Gabi 6. Through this, environmental impact assessment was performed for each process.

키워드

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Fig. 1. SEM image of (a) MgHx-CaO-10 wt.% MWCNT and mapping image of (b) MgHx-CaO-10 wt.% MWCNT in MgHx, (c) MgHx-CaO-10 wt.% MWCNT in carbon

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Fig. 2. XRD patterns of MgHx-CaO fabricated with 96 hours BCR 66:1 and MgHx-CaO-graphene/MWCNT (Mg: ●, MgH2: ◐, CaO: ♧, C Carbon: ♠)

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Fig. 5. Process flow diagram for Mg-CaO-MWCNT

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Fig. 3. Results for MgHx-CaO, MgHx-CaO-MWCNT composites by (a) TG analysis and (b) DSC analysis

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Fig. 6. Impact assessment results for manufacturing process of Mg-CaO-MWCNT by CML2001

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Fig. 7. Impact assessment results for manufacturing process of Mg-CaO-MWCNT by EI 99’

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Fig. 8. Co2 and Human toxicity emissions of Mg-CaO-MWCNT, human toxicity emissions of Mg-CaO

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Fig. 9. Human toxicity emission distribution

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Fig. 4. Kinetics results of MgHx-CaO and MgHx-CaO-MWCNT composites

Table. 1. Particle size analysis of MgHx-CaO-MWCNT compo-sites

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