Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Catalytic Behavior of Ni/CexZr1-xO2-Al2O3 Catalysts for Methane Steam Reforming: The CexZr1-xO2 Addition Effect on Water Activation

메탄 습식 개질 반응용 Ni/CexZr1-xO2-Al2O3 촉매의 반응 특성: CexZr1-xO2 첨가에 의한 물 활성화 효과

  • Haewon Jung (School of Chemical Engineering, University of Ulsan) ;
  • Huy Nguyen-Phu (School of Chemical Engineering, University of Ulsan) ;
  • Mingyan Wang (School of Chemical Engineering, University of Ulsan) ;
  • Sang Yoon Kim (School of Chemical Engineering, University of Ulsan) ;
  • Eun Woo Shin (School of Chemical Engineering, University of Ulsan)
  • Received : 2023.07.04
  • Accepted : 2023.07.11
  • Published : 2023.08.01
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Abstract

In this study, we investigated the effect of the CexZr1-xO2 (CZ) addition onto Ni/Al2O3 catalysts on the catalytic performance in methane steam reforming. In the reaction results, the CZ-added Ni/Al2O3 catalyst showed higher CH4 conversion and H2 yield under the same reaction conditions than Ni/Al2O3. From the characterization data, the two catalysts had similar support porosity and Ni dispersion, confirming that the two properties could not determine the catalytic performance. However, the oxygen vacancy over the CZ-added Ni/Al2O3 catalyst induced an efficient steam activation at low reaction temperatures, resulting in an increase in the catalytic activity and H2 yield.

본 연구에서는 메탄 습식 개질 반응용 Ni/Al2O3 촉매에 첨가된 CexZr1-xO2(CZ)가 촉매 반응 효율에 미치는 효과를 조사하였다. 반응 실험 결과, CZ 조촉매가 첨가된 Ni/Al2O3 촉매는 동일 온도, 동일 steam to carbon ratio에서 Ni/Al2O3 촉매보다 높은 메탄 전환율과 수소 수율을 보였다. 특성 분석 결과, 두 촉매 모두 유사한 기공 구조와 비슷한 Ni 분산도를 가지고 있어 이는 반응 효율에 영향을 미치는 요소가 아님을 확인하였다. 하지만, 라만 분광 분석결과에서 CZ 조촉매 첨가 Ni/Al2O3 촉매는 Ni/Al2O3 촉매와 달리 CZ상에서 oxygen vacancy가 존재하고, 이는 상대적으로 낮은 반응 온도에서 물 활성화를 촉진시키는 것으로 확인되었다. CZ 조촉매 상의 oxygen vacancy에 의한 물 활성화는 저온 영역에서 CZ 조촉매 첨가 Ni/Al2O3 촉매의 습식 개질 반응 성능을 증대시켰다.

Keywords

Acknowledgement

본 연구는 한국연구재단 기초연구실 사업(2020R1A4A4079954)과 지자체-대학협력기반 지역혁신 사업(울산·경남지역혁신플랫폼 저탄소그린에너지, 2021RIS-003)의 지원을 받아 이루어졌습니다.

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