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Title:
Role of different coordinated Cu and reactive oxygen species on the highly active Cu-Ce-Zr mixed oxides in NH3-SCO: a combined in situ EPR and O-2-TPD approach
Author: Qu, Zhenping1; Wang, Zhong1,2; Zhang, Xiaoyu1; Wang, Hui1
Source: CATALYSIS SCIENCE & TECHNOLOGY
Issued Date: 2016
Volume: 6, Issue:12, Pages:4491-4502
DOI: 10.1039/c5cy02125a
DOC Type: Article
English Abstract: Novel Cu-Ce-Zr mixed oxides were synthesized by a citric acid sol-gel method, and they exhibited an excellent NH3-SCO activity (180 degrees C, TOF = 1.33 h(-1)). The finely dispersed CuO, Cu-Ce-Zr solid solution and monomeric Cu2+ ions in octahedral sites were the main active sites. The finely dispersed CuO species were the NH3 adsorption sites, and their adsorption capacity could be improved by their good reducibility. The Cu-Ce-Zr solid solution was an important intermediate in oxygen transfer from bulk to surface. In situ EPR analysis indicated that the isolated Cu2+ located in the octahedral sites was more active compared with that located in the square-planar pyramidal sites, and it induced the formation of more Cu-Ce-Zr solid solution. Meanwhile, the in situ O-2-TPD results showed that both adsorbed oxygen and bulk lattice oxygen were the active oxygen adspecies, and the adsorbed oxygen molecules were more active than the bulk lattice oxygen in NH3 oxidation.
WOS Headings: Science & Technology ; Physical Sciences
WOS Subject: Chemistry, Physical
WOS Subject Extended: Chemistry
WOS Keyword Plus: SELECTIVE CATALYTIC-OXIDATION ; ELECTRON-PARAMAGNETIC-RESONANCE ; COPPER(II) ION-PAIRS ; SILVER-BASED CATALYSTS ; TRANSITION-METAL ; COMPOSITE CATALYST ; SOOT COMBUSTION ; AMMONIA ; NITROGEN ; TEMPERATURE
Indexed Type: SCI
Funder: National Natural Science Foundation of China(21377016 ; Natural Science Foundation of Liaoning Province(2014020011) ; Doctoral Fund of Shandong Province(BS2015HZ003) ; Open Foundation of Key Laboratory of Industrial Ecology and Environmental Engineering, MOE(KLIEEE-15-05) ; 21577014)
Language: 英语
WOS ID: WOS:000378276300045
Citation statistics:
Content Type: 期刊论文
URI: http://ir.qibebt.ac.cn/handle/337004/9360
Appears in Collections:多相催化转化团队_期刊论文

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description.institution: 1.Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn, Sch Environm Sci & Technol, Dalian 116024, Peoples R China
2.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Key Lab Biofuels, Qingdao 266101, Peoples R China

Recommended Citation:
Qu, Zhenping,Wang, Zhong,Zhang, Xiaoyu,et al. Role of different coordinated Cu and reactive oxygen species on the highly active Cu-Ce-Zr mixed oxides in NH3-SCO: a combined in situ EPR and O-2-TPD approach[J]. CATALYSIS SCIENCE & TECHNOLOGY,2016,6(12):4491-4502.
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