中国科学院大连化学物理研究所机构知识库
Advanced  
DICP OpenIR  > 中国科学院大连化学物理研究所  > 会议论文
学科主题: 物理化学
题名: PREFERENTIAL CO OXIDATION IN H2(PROX) ON IrFe CATALYSTS: 57Fe MOSSBAUER SPECTROSCOPIC STUDY
作者: Liu K(刘阔) ;  Zhang WS(张万生) ;  Wang JH(王军虎) ;  Huang YQ(黄延强) ;  Wang AQ(王爱琴) ;  Zhang T(张涛) ;  Shen JY(沈俭一)
会议名称: International Conference on the Applications of the Mossbauer Effect
会议日期: 2009-7-19
出版日期: 2009-07-19
会议地点: Austria
其他题名: IrFe催化剂上的CO选择氧化(PROX)反应的57Fe穆斯堡尔谱研究
通讯作者: Tao Zhang ;  Jianyi Shen
部门归属: 十五室
主办者: Vienna University of Technology
摘要: Preferential CO oxidation in H2 (PROX) has been deemed as a promising way to minimize the CO amount in H2 for the PEMFC. Recently, our group reported that Ir-Fe catalysts were highly active and selective for PROX reaction [1, 2]. It is accepted that Fe plays an important role in activating O2 during PROX reaction, so we made an in situ Mössbauer study on the IrFe catalysts to elucidate the iron state during PROX reaction. Ir/Fe/Al2O3 and Fe/Ir/Al2O3 were obtained through different impregnation sequences, while an Ir-Fe/Al2O3 was prepared by co-impregnation method. Fig. 1 compares the catalytic performances of the three catalysts in the PROX reaction. With the difference in the impregnation sequence, the activity and selectivity varied, following the order of Ir-Fe/Al2O3>Fe/Ir/Al2O3>Ir/Fe/Al2O3. Fig. 2 and Table 1 show the in situ 57Fe Mössbauer spectra of the three catalysts after reduction and PROX reaction. The results show marked differences in the reduction behaviour, pointing out that the impregnating sequence influences the reducibility of these catalysts. The reduction of Ir-Fe/Al2O3 even leads to the formation of FeIr alloy whereas no zero-valent iron is observed for Ir/Fe/Al2O3. The Mössbauer parameters (Fe2+(a), QS = 2.38mm s-1; Fe2+(b), QS = 1.55 mm s-1) are characteristic of two different kinds of Fe2+. However, exposure of the reduced catalysts to PROX gas mixture at 80oC converts Fe2+(b) and FeIr alloy completely to Fe3+. Fe2+(a) and Fe0 decreased as well. After PROX reaction, the overall amount of the reducible iron components in the catalysts, including Fe0 and Fe2+(a), follows the order of Ir-Fe/Al2O3>Fe/Ir/Al2O3>Ir/Fe/Al2O3. This trend is consistent with that of the activity. In conclusion, we suggest that it is FeOx (1≥x) that plays the part of activating O2 during PROX reaction.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/113514
Appears in Collections:中国科学院大连化学物理研究所_会议论文

Files in This Item:

There are no files associated with this item.


Recommended Citation:
Liu K,Zhang WS,Wang JH,et al. PREFERENTIAL CO OXIDATION IN H2(PROX) ON IrFe CATALYSTS: 57Fe MOSSBAUER SPECTROSCOPIC STUDY[C]. 见:International Conference on the Applications of the Mossbauer Effect. Austria. 2009-7-19.
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [刘阔]'s Articles
 [张万生]'s Articles
 [王军虎]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [刘阔]‘s Articles
 [张万生]‘s Articles
 [王军虎]‘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 
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!
Powered by CSpace