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- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received June 30, 2026
Revised August 25, 2026
Accepted September 19, 2026
Available online October 20, 2026
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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수동촉매재결합기용 Pt/Al₂O₃ 촉매의 알루미나 지지체 효과: 수소 재결합 발열 및 수소 저감 성능 분석
Effects of Alumina Support on the Heat Generation and Hydrogen Mitigation Performance of Pt/Al2O3 Catalysts for Passive Autocatalytic Recombiners
https://doi.org/10.9713/kcer.2026.64.4.105180
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Abstract
수소 재결합장치(passive autocatalytic recombiner, PAR)는 원전 격납건물 내 수소에 의한 폭발을 방지하는 비전원 안전설비로, Pt 촉매에서 H₂ + 1/2 O₂→ H₂O 반응으로 인한 발열을 이용하여 자연 대기 순환을 유발한다. 본 연구에서는 α-, θ-, γ 타입의 Al₂O₃지지체에 0.5 wt% Pt를 담지한 상용 촉매의 발열 거동과 H₂저감 효율을 비교하였다. 동일한 조건에서 세 지지체의 발열량(ΔT)은 유사하였으나, 수소 전환율은 α (97.65%), γ (96.08%), θ (91.50%)로, α-Al₂O₃가 수소 제거를 위한 상대적으로 우수한 지지체임을 확인하였다. ΔT는 H₂공급량에 선형적으로 비례하였으며, 압력 변화에는 큰 영향을 받지 않았다. 상대습도 영향 평가에서는 0–60% RH 범위에서 ΔT 감소가 약 7 K로 제한적이었으나, 80% RH에서는 약 23 K의 추가 감소와 발열 지연이 관찰되었다. 추가적으로 알루미나계 평면형 지지체인 APA-Pt 모듈은 동일 Pt 담지량 기준에서 충진층 기준 시료 대비 높은 ΔT를 보여 저압손실형 PAR 모듈 형상으로의 적용 가능성을 보였다.
Passive autocatalytic recombiners (PARs) are passive safety devices that prevent hydrogen explosions in nuclear containment buildings by inducing natural air circulation through the heat generated by H₂+1/2O₂→ H₂O over Pt catalysts. In this study, commercial 0.5 wt% Pt catalysts supported on α-, θ-, and γ-Al₂O₃were compared in terms of heat-generation behavior and H₂mitigation efficiency. Although the three supports showed similar ΔT under identical conditions, H₂conversion followed the order α-Al₂O₃(97.65%) > γ-Al₂O₃(96.08%) > θ-Al₂O₃(91.50%), indicating that α-Al₂O₃is a relatively superior support. ΔT increased linearly with H₂supply and was weakly affected by pressure. Relative humidity up to 60% caused only a small ΔT decrease, whereas 80% RH resulted in an additional 23 K decrease and delayed heat generation. Furthermore, the alumina paper based-Pt module also showed promise as a low-pressure-drop PAR configuration.
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