...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Determination of Intermediates and Mechanism for Soot Combustion with NO_x/O_2 on Potassium-Supported Mg-AI Hydrotalcrte Mixed Oxides by In Situ FTIR
【24h】

Determination of Intermediates and Mechanism for Soot Combustion with NO_x/O_2 on Potassium-Supported Mg-AI Hydrotalcrte Mixed Oxides by In Situ FTIR

机译：原位FTIR测定钾负载的Mg-Al水滑石混合氧化物上NO_x / O_2燃烧烟气的中间体及机理

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

The soot combustion with NOx and/or O_2 on potassium-supported Mg-AI hydrotalcite mixed oxides under tight contact condition was studied using temperature-programmed oxidation (TPO), isothermal reaction and in situ FTIR techniques. The presence of NOx in O_2 favors the soot combustion at lower temperatures (<300 ℃). However, a little suppression was observed at higher temperatures (>300 ℃), which was accompanied by a substantial NO_x reduction.The ketene (C=C=O) and isocyanate (NCO~-) species were determined as the reaction intermediates. In NO_x + O_2, NO_2 directly interacts with the free carbon sites (C=C~*) through two parallel reactions: (1) NO_2 + C=C~*→C=C=O + NO; (2) NO_2 + C=C~*→ NCO + CO_2. The two reactions can proceed easily, which accounts for the promotion effect of NO, on soot combustion at lower temperatures. The further oxidation of NC0~- by NO_2 or O_2 is responsible for the simultaneous reduction of NO_x. However, the reactions between NO_2and C=C~* are limited by the amount of free carbon sites, which can be provided by the oxidation of soot by O_2 at higher temperatures. The interaction of NO, and catalyst results in the formation of nitrates and nitrites, which poisoned the active K sites.
机译：利用程序升温氧化（TPO），等温反应和原位FTIR技术研究了紧密接触条件下钾负载的Mg-Al水滑石混合氧化物上NOx和/或O_2的烟燃烧。 O_2中NOx的存在有利于较低温度（<300℃）下的烟灰燃烧。但是，在较高温度（> 300℃）下几乎没有抑制作用，并伴有大量的NO_x还原。确定了烯酮（C = C = O）和异氰酸酯（NCO〜-）作为反应中间体。在NO_x + O_2中，NO_2通过两个平行的反应直接与自由碳位（C = C〜*）相互作用：（1）NO_2 + C = C〜*→C = C = O + NO； （2）NO_2 + C = C〜*→NCO + CO_2。这两个反应很容易进行，这说明了NO对较低温度下烟灰燃烧的促进作用。 NO_2或O_2对NC0〜-的进一步氧化负责同时还原NO_x。然而，NO_2和C = C〜*之间的反应受到游离碳位点数量的限制，游离碳位点的数量可以通过高温下O_2对烟灰的氧化来提供。 NO和催化剂的相互作用导致形成硝酸盐和亚硝酸盐，这会毒化活性钾位。

著录项

  • 来源
    《Environmental Science & Technology》 |2010年第21期|p.8254-8258|共5页
  • 作者

    ZHAOLIANG ZHANG; YEXIN ZHANG; QINGYUN SU; ZHONGPENG WANG; Q1AN LI; XIYAN GAO;

  • 作者单位

    College of Chemistry and Chemical Engineering, University of Hnan, 106 Jiwei Rd., Jinan 250022, P. R. China;

    rnCollege of Chemistry and Chemical Engineering, University of Hnan, 106 Jiwei Rd., Jinan 250022, P. R. China,Liaoning key laboratory of Internal Combustion Engines, Institute of Internal Combustion Engine, Dalian University of Technology, 2 Linggong Rd., Dalian, 116024, P. R. China;

    rnLiaoning key laboratory of Internal Combustion Engines, Institute of Internal Combustion Engine, Dalian University of Technology, 2 Linggong Rd., Dalian, 116024, P. R. China;

    rnCollege of Chemistry and Chemical Engineering, University of Hnan, 106 Jiwei Rd., Jinan 250022, P. R. China;

    rnCollege of Chemistry and Chemical Engineering, University of Hnan, 106 Jiwei Rd., Jinan 250022, P. R. China;

    rnLiaoning key laboratory of Internal Combustion Engines, Institute of Internal Combustion Engine, Dalian University of Technology, 2 LinggongRd., Dalian, 116024, P. R. China;

  • 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
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