中国科学院生态环境研究中心机构知识库
Advanced  
RCEES OpenIR  > 大气污染控制中心  > 期刊论文
题名: Oxygen vacancies on nanosized ceria govern the NOx storage capacity of NSR catalysts
作者: Zhang, Yan; Yu, Yunbo; He, Hong
刊名: CATALYSIS SCIENCE & TECHNOLOGY
出版日期: 2016
卷号: 6, 期号:11, 页码:3950-3962
DOI: 10.1039/c5cy01660f
部门归属: 大气污染控制中心
英文摘要: Pt/BaO/CeO2 catalysts derived from CeO2 nanomaterials with shapes of rods, cubes, and particles were investigated for NOx storage/reduction. Catalytic tests were performed in a transient flow reactor system. A series of characterization techniques including XRD, TEM, XPS, EXAFS, NOx-TPD, H-2-TPR and in situ DRIFTS were conducted to investigate the electrical, chemical, and structural properties. The NOx storage-reduction performance ranked by the CeO2 support was nanorods > nanoparticles > nanocubes. Amazingly, the CeO2-nanorod based NSR catalyst possessed a superior NOx storage capacity (NSC) of 913.8 mu mol NOx g(cat)(-1) at 350 degrees C in the absence of H2O and CO2, which almost reached the theoretical value. Even under harsh lean-rich cycling conditions (90 s vs. 6 s) and a high GHSV of 360000 h(-1), the nanorod-based catalyst also showed the best reduction efficiency, affording similar to 99% NOx conversion levels from 200 degrees C to 400 degrees C under the conditions without H2O and CO2. The morphology of ceria has significant influences on the selectivity of ammonia, and on the H2O and CO2 tolerance during the NSR process. For the first time, a close linear correlation was drawn between the NOx storage capacity and the amount of oxygen vacancies of NSR catalysts. Over the NSR catalysts, oxygen vacancies play a crucial role in anchoring Pt. Meanwhile, H-2-TPR results showed that the number of active surface oxygen species trapped in oxygen vacancies was closely related to the NSC value. This suggests that the oxygen vacancies on the NSR surface govern the NOx storage capacity by creating efficient sites or channels for the formation of nitrate and its further transformation to Ba-based storage sites. These findings may be fundamental for designing ceria-based NSR catalysts with better performance.
收录类别: SCI
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35761
Appears in Collections:大气污染控制中心_期刊论文

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
Oxygen vacancies on nanosized ceria govern the NOx storage capacity of NSR catalysts.pdf(6562KB)期刊论文作者接受稿开放获取View Download
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Zhang, Yan]'s Articles
[Yu, Yunbo]'s Articles
[He, Hong]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Zhang, Yan]‘s Articles
[Yu, Yunbo]‘s Articles
[He, Hong]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: Oxygen vacancies on nanosized ceria govern the NOx storage capacity of NSR catalysts.pdf
格式: Adobe PDF
此文件暂不支持浏览
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院生态环境研究中心 - Feedback
Powered by CSpace