催化学报 ›› 2014, Vol. 35 ›› Issue (8): 1289-1298.DOI: 10.1016/S1872-2067(14)60154-6

• 论文 • 上一篇    下一篇

非晶Ce-Ti氧化物用于NH3选择性催化还原NO的原位红外研究

李倩a,b, 谷华春a, 李萍a, 周钰浩a, 刘莹a, 齐中囡a, 辛颖a, 张昭良a,b   

  1. a. 济南大学化学化工学院, 山东济南 250022;
    b. 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 江苏南京 210044
  • 收稿日期:2014-03-31 修回日期:2014-05-23 出版日期:2014-08-01 发布日期:2014-08-05
  • 通讯作者: 张昭良
  • 基金资助:

    国家自然科学基金(21277060和21107030);山东省科技发展计划项目(2011GSF11702);山东省优秀中青年科学家科研奖励基金(BS2011HZ002);山东省自然科学基金(ZR2013BQ003);江苏省大气环境监测与污染控制高技术研究重点实验室开放基金(KHK1116),江苏省环境科学与工程优势学科平台.

In situ IR studies of selective catalytic reduction of NO with NH3 on Ce-Ti amorphous oxides

Qian Lia,b, Huachun Gua, Ping Lia, Yuhao Zhoua, Ying Liua, Zhongnan Qia, Ying Xina, Zhaoliang Zhanga,b   

  1. a. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, China;
    b. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Sciences and Engineering, Nanjing University of Information Sciences and Engineering, Nanjing 210044, Jiangsu, China
  • Received:2014-03-31 Revised:2014-05-23 Online:2014-08-01 Published:2014-08-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21277060 and 21107030), the Development Program of the Science and Technology of Shandong Province (2011GSF11702), the Foundation for Outstanding Young Scientist in Shandong Province (BS2011HZ002), the Natural Science Foundation of Shandong Province (ZR2013BQ003), and the Open Project from Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control of Nanjing University of Information Science and Technology (KHK1116), Jiangsu Province Innovation Platform for Superiority Subject of Environmental Science and Engineering.

摘要:

采用原位红外光谱研究了在具有短程有序Ce-O-Ti结构的非晶Ce-Ti氧化物上NH3选择性催化还原(SCR) NOx反应. 在反应条件下,催化剂表面主要被NH3吸附物种覆盖,而检测不到NOx吸附物种. 经测定,NO的反应级数为0.5-0.6,表明Langmuir-Hinshelwood机理和Eley-Rideal机理同时存在. 可能的机理是NH3吸附物种和弱吸附的NOx反应,生成NHyNO3y = 0-4)活性中间物种,并通过GAUSSIAN计算和原位红外结果证实了它们的存在. Ce-O-Ti结构中Ce与Ti之间表现出原子尺度的相互作用,所以在SCR反应的活性温度窗口下,催化剂的氧化还原活性提高.

关键词: 选择性催化还原, 一氧化氮, 氨气, 非晶Ce-Ti氧化物, 原位红外, 机理

Abstract:

A series of in situ infrared (IR) studies of the selective catalytic reduction (SCR) of NOx with NH3 on the short-range ordered structure Ce-O-Ti sites in amorphous Ce-Ti mixed oxides were performed. Under the reaction conditions, the catalyst surface was mainly covered by NH3 ad-species and no NOx ad-species were detected. The reaction order of 0.5-0.6 with respect to NO confirmed a hybrid Langmuir-Hinshelwood and Eley-Rideal mechanism. A possible route may involve the reaction of NH3 ad-species and weakly adsorbed NOx to form an active intermediate, NHyNO3 (y = 0-4); this was confirmed by GAUSSIAN calculations and the in situ IR results. The Ce-O-Ti structure, with Ce-Ti interactions on the atomic scale, enhanced the redox properties in the active temperature window of the SCR reactions.

Key words: Selective catalytic reduction, Nitrogen oxide, Ammonia, Amorphous Ce-Ti mixed oxide, In situ infrared, Mechanism