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首页> 外文期刊>Environmental Science & Technology >Urealess NOx Reduction by Carbon Monoxide in Simulated Lean-Burn Exhausts
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Urealess NOx Reduction by Carbon Monoxide in Simulated Lean-Burn Exhausts

机译：通过模拟瘦燃烧排气中的一氧化碳减少尿尿NOx

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摘要

The lean NOx aftertreatment is one of the major barriers to the widespread adoption of advanced combustion powertrains for the reduction of both greenhouse gases and toxic exhausts. Urea/SCR, selective catalytic reduction of NOx by NH_3 generated through urea decomposition, is commonly regarded as the best way to reduce NOx in low temperature lean exhaust. However, the urea/SCR system has inherent drawbacks, i.e., periodic refill of the aqueous urea solution and a complicated hardware system. Here, we demonstrated a state-of-the-art catalyst that is extremely selective and efficient for reducing NOx, primarily with the most abundant reductant, CO, particularly in the presence of O_2 (＞5%) at low temperature. Under temperatures lower than 250 °C, IrRu/Al_2O_3 catalysts achieved higher NOx conversion by CO only than a commercial Cu-based urea/SCR catalyst employing NH_3 as a primary reductant. Furthermore, the IrRu catalyst revealed high thermal stability and SO_2 tolerance, which are very important factors for real world applications.
机译：精益NOx后处理是广泛采用先进燃烧动力驱动的主要障碍之一，用于减少温室气体和毒性排气。尿素/ SCR，通过尿素分解产生NH_3的选择性催化还原NOx，通常被认为是降低低温稀释排气中NOx的最佳方法。然而，尿素/ SCR系统具有固有的缺点，即含水尿素溶液的周期性补充和复杂的硬件系统。在这里，我们证明了最先进的催化剂，其对于减少NOx来说是极其选择性和有效的，主要是在低温下的O_2（> 5％）存在下的最丰富的NOx。在低于250℃的温度下，IRRU / Al_2O_3催化剂仅比商业Cu基脲/ SCR催化剂达到较高的NOx转化率，所述脲催化剂用作初级还原剂。此外，IRRU催化剂揭示了高热稳定性和SO_2耐受性，这对现实世界应用是非常重要的因素。

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  • 来源
    《Environmental Science & Technology》 |2020年第13期|8344-8351|共8页
  • 作者

    Iljeong Heo; Young Woo You; Jin Hee Lee; Steven. J. Schmieg; Dal Young Yoon; Chang Hwan Kim;

  • 作者单位

    Research Center for Environment & Sustainable Resources Korea Research Institute of Chemical Technology Daejeon 34114 Republic of Korea Department of Chemical Engineering University of Michigan Ann Arbor Michigan 48109 United States;

    Research Center for Enviromtient & Sustainable Resources Korea Research Institute of Chemical Technology Daejeon 34114 Republic of Korea Department of Chemical & Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea;

    Research Center for Environment & Sustainable Resources Korea Research Institute of Chemical Technology Daejeon 34114 Republic of Korea;

    Chemical & Materials Systems Lab General Motors Global Research and Development Warren Michigan 48090 United States;

    Institute of Fundamental & Advanced Technology R&D Division Hyundai Motor Company Gyeonggi-do 16082 Republic of Korea;

    Chemical & Materials Systems Lab General Motors Global Research and Development Warren Michigan 48090 United States Institute of Fundamental & Advanced Technology R&D Division Hyundai Motor Company Gyeonggi-do 16082 Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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