The promotion effect of Sb on the Na resistance of Mn/TiO2 catalyst for selective catalytic reduction of NO with NH3. (1st April 2016)

• Record Type: Journal Article
• Authors: Yang, Ning-zhi; Guo, Rui-tang; Pan, Wei-guo; Chen, Qi-lin; Wang, Qing-shan; Lu, Chen-zi
• Is Part Of: Fuel. Volume 169(2016)
• Page Start: 87
• Page End: 92
• Publication Date: 2016-04-01
• Subjects: Mn/TiO2 catalyst -- SCR -- Na -- Sb -- Resistance -- Promotion mechanism; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2015.12.009
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Mn–Sb/TiO2 catalyst shows higher NH3 -SCR activity and wider temperature window than Mn/TiO2 catalyst. Mn–Sb/TiO2 catalyst has much better Na-resistance than Mn/TiO2 catalyst. The addition of Sb on Mn/TiO2 catalyst can improve its low-temperature reducibility. The addition of Sb on Mn/TiO2 catalyst can generate strong Lewis acid sites for NH3 adsorption. Abstract: Na has a serious deactivation effect on Mn/TiO2 catalyst for selective catalytic reduction of NO with NH3 . In this study, it was found that Sb had a promotion effect on the Na resistance of MnOx/TiO2 catalyst. Then the promotion mechanism was investigated based on the characterization results of BET, XRD, H2 -TPR, NH3 -TPD, XPS and in situ DRIFT. The results of H2 -TPR and NH3 -TPD showed that the addition of Sb on MnOx/TiO2 could enhance the redox ability and surface acidity respectively, and the results of DRIFT indicated that the addition of Sb on MnOx/TiO2 could generate strong Lewis acid sites on the catalyst surface for NH3 adsorption. Therefore, the doping of Sb has a promotion effect on the Na resistance of Mn/TiO2 catalyst.