Effects of different manganese precursors as promoters on catalytic performance of CuO–MnOx/TiO2 catalysts for NO removal by CO
Literature Information
Chuanzhi Sun, Yingjie Tang, Fei Gao, Jingfang Sun, Kaili Ma, Changjin Tang
Two different precursors, manganese nitrate (MN) and manganese acetate (MA), were employed to prepare two series of catalysts, i.e., xCuyMn(N)/TiO2 and xCuyMn(A)/TiO2, by a co-impregnation method. The catalysts were characterized by XRD, LRS, CO-TPR, XPS and EPR spectroscopy. The results suggest that: (1) both xCuyMn(N)/TiO2 and xCuyMn(A)/TiO2 catalysts exhibit much higher catalytic activities than an unmodified Cu/TiO2 catalyst in the NO + CO reaction. Furthermore, the activities of catalysts modified with the same amount of manganese are closely dependent on manganese precursors. (2) The enhancement of activities for Mn-modified catalysts should be attributed to the formation of the surface synergetic oxygen vacancy (SSOV) Cu+–□–Mny+ in the reaction process. Moreover, since the formation of the SSOV (Cu+–□–Mn3+) in the xCuyMn(N)/TiO2 catalyst is easier than that (Cu+–□–Mn2+) in the xCuyMn(A)/TiO2 catalyst, the activity of the xCuyMn(N)/TiO2 catalyst is higher than that of the xCuyMn(A)/TiO2 catalyst. This conclusion is well supported by the XPS and EPR results.
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![1,10-bis(3,5-dimethylphenyl)-12-hydroxy-4,5,6,7-tetrahydroiindeno[7,1-de:1',7'-fg][1,3,2]dioxaphosphocine 12-oxide structure 1,10-bis(3,5-dimethylphenyl)-12-hydroxy-4,5,6,7-tetrahydroiindeno[7,1-de:1',7'-fg][1,3,2]dioxaphosphocine 12-oxide structure](https://static.chemtradehub.com/structs/141/1412439-82-7-b9a9.webp)
