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《Chinese Rare Earths》 2014-03
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Preparation and Characterization of Nano-ABO_x( A =La,Y; B =Mn,Co,Ni)and Their Catalytic Activity for Removal of NO + CO

QIAN Fang-bing;WANG Li;SHEN Jian-yu;FU Jiao-luan;WU Ke-yong;CHEN Xiao;Faculty of Material Science and Chemical Engineering ,Ningbo University;The State Key Laboratory Base of Novel Functional Materials and Preparation Science;  
In order to research the regulation among A and B on the catalytic activity of the nanoperovskite ABOxfor NO+ CO and the catalytic mechanism,perovskite type oxides ABOx( A = La,Y; B = Mn,Co,Ni) were prepared by a citric acid sol-gel method and characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),X-ray photoelectron spectroscopy( XPS) and N2physisorption( BET). The catalytic activity of the oxides for NO + CO was tested. The obtained results indicated that the activity of catalysts for CO is in the order of LaNiOx YCoOx YNiOx YMnOx LaCoOxLaMnOxand that for NO is in the order of LaNiOx YCoOx YNiOx LaCoOx YMnOx LaMnOx. LaNiOxexhibits the best catalytic activity and complete conversion of CO and NO at 350 ℃. Valence state and d-electron number of B,specific surface area and the kind of oxygen in catalyst are the key factors influencing catalytic activity. Different A( La3 +,Y3 +) in catalysts with same B have great impact on catalytic activity through influencing lattice oxygen( OL) and valence of B.
【Fund】: 浙江省自然基金项目资助(Y5080288);; 宁波市自然基金项目资助(2013A610077)
【CateGory Index】: O643.36
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