192-192 2024 [추계학술대회]
| 제목 | 고온 수열열화가 H2-SCR NOx 정화 특성에 미치는 영향 |
|---|---|
| 분야 | 에너지 및 배기 |
| 언어 | English |
| 저자 | 이경석(한국자동차연구원), 김철호(한국자동차연구원), 이경복(한국자동차연구원), 김길동(한국자동차연구원), 오광철(한국자동차연구원) |
| Key Words | Hydrogen-SCR; H2-ICE aftertreatment, Hydrothermal aging, NOx conversion, Pt/ZSM-5 catalyst |
| 초록 |
The sustainable energy and environmental concerns in transport are being addressed through decarbonization efforts and the potential use of carbon-free and zero-emission alternative fuels. Hydrogen fuel has attracted significant attention in recent years because due to its high potential for reducing carbon-containing emissions, such as CO, CO2, and soot. An internal combustion engine using hydrogen fuel (H2-ICE) can generate sufficient engine power while producing only H2O from the combustion process. However, the fast flame propagation rate of H2 promotes the formation of tailpipe NOx emissions due to high heat generation in the confined in-cylinder environment during high-temperature and high-load operations. This is one of the primary challenges in the development of H2-ICE technology. The formation of nitrogen oxides (NOx) from H2-ICE is regarded as a major cause of atmospheric pollution, which should be reduced by modification of engine-operation (high A/F, EGR, and optimal fuel injection strategy) and applying appropriate aftertreatment devices. To successfully reduce NOx emissions and inhibit undesirable side reactions, H2-ICE deNOx aftertreatment systems must be reliable and well-suited, with satisfactory catalytic performance. The present study aims to investigate the effect of hydrothermal aging on deNOx performance over the H2-SCR catalysts. In most H2-SCR studies, the Pt/TiO2 catalyst has demonstrated reasonable H2-SCR activity at low reaction temperatures. However, the reaction characteristics of hydrothermal aged catalyst are not fully understood due to a lack of relevant studies. Thus, this study focuses on comparing the resistance to hydrothermal aging between Pt/TiO2 and Pt/ZSM-5 catalysts. The catalytic performance was systematically evaluated using a laboratory aftertreatment bench-test rig. The effects of catalyst support, loading amount of Pt (0.1, 0.25 and 0.5 wt.%) and reaction conditions (NOx/H2 ratio and O2 content) on NOx conversion were tested on both fresh and hydrothermally aged catalysts. The experimental results show that the ZSM-5-supported H2-SCR catalyst exhibits higher resistant to hydrothermal aging (600 °C for 12 h with 10 vol.% H2O) compared to the TiO2-supported catalyst. [Acknowledgment] This research was financially supported by “Technology Innovation Program (Development of Direct Injection Hydrogen Engine Source Technology base on Carbon-Free Hydrogen Fuel, 20018473)” funded by the Ministry of Trade, Industry and Energy and “Regional Innovation Cluster Development Program (R&D, P0025423)” supervised by the Korea Institute for Advancement of Technology (KIAT) funded by the Ministry of Trade, Industry and Energy, Republic of Korea. |
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