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Synthesis of CuyMnzAl1-zOx mixed oxide as low-temperature NH3-SCR catalyst with enhanced catalytic performance

Abstract

A new type of low-temperature selective catalytic reduction (SCR) catalyst CuyMnzAl1-zOx derived from layered double hydroxides was presented in this contribution. By tuning the Cu/Mn/Al ratio, the optimal catalyst Cu2Mn0.5Al0.5Ox resulted in a NOx conversion of 91.2% at 150 oC, which is much higher than that of all other control catalysts Cu2AlOx (71.1%), Cu-Mn/γ-Al2O3 (65.23%), and Mn/γ-Al2O3 (59.32%). All samples were characterized in detail using various physico-chemical techniques including XRD, BET, FTIR, TEM, H2-TPR, NH3-TPD, and XPS analyses, and the results revealed that the superior catalytic performance of Cu2Mn0.5Al0.5Ox catalyst can be attributed to its high specific surface area, high reducibility of MnO2 and CuO species, abundance of surface acid sites, and the well dispersion of MnO2 and CuO species. FTIR analyses of pyridine adsorbed samples revealed that the catalytic activity is proportional to the amount of Lewis acid sites. Cu2Mn0.5Al0.5Ox also showed much higher resistance to 100 ppm SO2 and 5% H2O than the control catalysts. The poisoning mechanism and the regenerability of Cu2Mn0.5Al0.5Ox catalyst was also investigated. In all, compared with the control catalysts of Cu2AlOx, Cu-Mn/γ-Al2O3, and Mn/γ-Al2O3, the newly designed Cu2Mn0.5Al0.5Ox catalyst is not only more active at low temperatures (100–250 oC), but also relatively more robust in the presence SO2 and H2O.

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Publication details

The article was received on 02 Jun 2017, accepted on 11 Jul 2017 and first published on 11 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT02000G
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Synthesis of CuyMnzAl1-zOx mixed oxide as low-temperature NH3-SCR catalyst with enhanced catalytic performance

    Q. Yan, S. Chen, L. Qiu, Y. Gao, D. O’Hare and Q. Wang, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02000G

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