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Comparative Study of CuO Species on CuO/Al2O3, CuO/CeO-Al2O3 andCuO/La2O-Al2O3 Catalysts for CO Oxidation
Ling-yun Jin,Mai He,Ji-qing Lu,Meng-fei Luo*,Ping Fang,Yun-long Xie
Author NameAffiliationE-mail
Ling-yun Jin Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Mai He Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Ji-qing Lu Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Meng-fei Luo* Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China mengfeiluo@zjnu.cn 
Ping Fang Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Yun-long Xie Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Abstract:
CuO/Al2O3, CuO/CeO2-Al2O3, and CuO/La2O3-Al2O3 (denoted as Cu/Al, Cu/CeAl, and Cu/LaAl) catalysts were prepared by an impregnation method. CuO species and CuO/Al2O3 thermal solid-solid interaction were characterized by in situ XRD, Raman spectroscopy and H2-TPR techniques. For the Cu/Al catalyst, a CuAl2O4 phase exists between the CuO and Al2O3 layer and the CuO phase exists on the surface in both highly dispersed and bulk forms. For the Cu/CeAl catalyst, there is highly dispersed and bulk CuO on the surface, but most of the CuO has transferred into the internal layer of CeO2 as bulk CuO and CuAl2O4. For the Cu/LaAl catalyst, only bulk CuO is present on the surface of the catalyst and no CuAl2O4 is formed. The catalytic activity order for CO oxidation is Cu/CeAl>Cu/Al>Cu/LaAl. The highly dispersed CuO on the catalyst surface may be the active phase for CO oxidation. The results show that the addition of CeO2 not only promotes both the transference of CuO and the formation of CuAl2O4 but also favors the CO oxidation due to the association of highly dispersed CuO with CeO2, while La2O3 hinders the transference of CuO and the formation of CuAl2O4.
Key words:  CuO/Al2O3, CuO/CeO2-Al2O3, CuO/La2O3-Al2O3, in situ XRD, Raman, TPR
FundProject:the National Natural Science Foundation of China (No.20473075)
CuO/Al2O3、CuO/CeO2-Al2O3和CuO/La2O3-Al2O3催化剂中CuO物种被CO氧化的比较
金凌云,何迈,鲁继青,罗孟飞*,方萍,谢云龙
摘要:
用浸渍法制备了CuO/Al2O3 (Cu/Al)、CuO/CeO2- Al2O3 (Cu/CeAl)和CuO/La2O3-Al2O3(Cu/LaAl)催化剂. 通过原位XRD、Raman和H2-TPR方法, 对催化剂中的CuO物种以及CuO-Al2O3的固-固相反应进行了表征. 结果表明,对于Cu/Al催化剂,CuAl2O4存在于CuO与Al2O3层之间,CuO以高分散和晶相两种相态存在于催化剂的表层;对于Cu/CeAl催化剂,除了少量高分散和晶相的CuO存在于表层外,大部分CuO迁移到了CeO2的内层,
关键词:  CuO/Al2O3,CuO/CeO2-Al2O3,CuO/La2O3-Al2O3,原位XRD,Raman,TPR
DOI:10.1088/1674-0068/20/05/582-586
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