...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Synergistic Effect of Cu/CeO_2 and Pt-BaO/CeO_2 Catalysts for a Low-Temperature Lean NO_x Trap
【24h】

Synergistic Effect of Cu/CeO_2 and Pt-BaO/CeO_2 Catalysts for a Low-Temperature Lean NO_x Trap

机译：Cu / CeO_2和Pt-BaO / CeO_2催化剂对低温贫NO_x捕集阱的协同作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A lean NOx trap (LNT) catalyst has been widely used for removing NOx exhaust from lean-burn engines. However, the operation range of LNT has been limited because of the poor activity of LNT catalysts at low temperatures (= 300 degrees C), especially in urban driving conditions. To increase NOx removal efficiency during lean rich cycle operation, a Cu/CeO2 (CC) catalyst was added to a Pt-BaO/CeO2 (PBC) catalyst. In comparison to PBC- or CC-only catalysts, the physical mixture of PBC and CC catalysts (PBC + CC) exhibited a significant synergy for both NO, storage and reduction efficiencies. In particular, low-temperature activity below 200 degrees C was greatly enhanced. A Pt-BaO-Cu/CeO2 (PBCC) catalyst, which was synthesized by depositing Pt and Cu together on a ceria support, showed poorer NOx removal efficiency. The origin of the synergistic effect over PBC + CC was investigated. Under lean conditions, the CC showed much better activity for NO oxidation, allowing for faster NOx storage on PBC. Under rich conditions, H-2 was generated in situ on the CC by a water-gas shift reaction then accelerated the reduction of NOR, which had been stored on PBC, with a higher selectivity to N-2. This simple modification in the catalyst can provide an important clue to enhance low-temperature activity of the commercial LNT system.
机译：稀薄的NOx捕集器（LNT）催化剂已被广泛用于去除稀薄燃烧发动机的NOx排放。然而，由于LNT催化剂在低温（＜＝ 300℃）下的不良活性，特别是在城市驾驶条件下，LNT的操作范围受到限制。为了在稀空燃比循环操作过程中提高NOx去除效率，将Cu / CeO2（CC）催化剂添加到Pt-BaO / CeO2（PBC）催化剂中。与仅使用PBC或CC的催化剂相比，PBC和CC催化剂的物理混合物（PBC + CC）在NO，存储和还原效率方面均表现出显着的协同作用。特别地，大大提高了低于200℃的低温活性。通过将Pt和Cu一起沉积在二氧化铈载体上合成的Pt-BaO-Cu / CeO2（PBCC）催化剂显示出较差的NOx去除效率。研究了在PBC + CC上产生协同效应的起源。在稀薄条件下，CC表现出更好的NO氧化活性，可以更快地将NOx储存在PBC上。在丰富的条件下，通过水煤气变换反应在CC上原位生成H-2，然后加速了NOR的还原反应，该反应已存储在PBC上，对N-2的选择性更高。催化剂中的这种简单改性可以提供重要线索，以增强商业LNT系统的低温活性。

著录项

  • 来源
    《Environmental Science & Technology》 |2019年第5期|2900-2907|共8页
  • 作者

    Kim Beom-Sik; Kim Pyung Soon; Bae Junemin; Jeong Hojin; Kim Chang Hwan; Lee Hyunjoo;

  • 作者单位

    Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 34141, South Korea;

    Hyundai Motor Grp, Adv Catalysts & Emiss Control Res Lab, Hwaseong 18280, Gyeonggi, South Korea;

    Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 34141, South Korea;

    Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 34141, South Korea;

    Hyundai Motor Grp, Adv Catalysts & Emiss Control Res Lab, Hwaseong 18280, Gyeonggi, South Korea;

    Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 34141, South 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号