1. Effect of Ceria Precursor on the Physicochemical and Catalytic Properties of Mn-W/CeO2 Nanocatalysts for NH3 SCR at Low Temperature.
- Author
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Xiuyun Wang, Kai Zhang, Weitao Zhao, Yangyu Zhang, Zhixin Lan, Tianhua Zhang, Yihong Xiao, Yongfan Zhang, Huazhen Chang, and Lilong Jiang
- Subjects
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CERIUM oxides , *NANORODS , *TEMPERATURE effect , *CATALYTIC activity , *DENSITY functional theory , *REACTION mechanisms (Chemistry) - Abstract
A series of Mn-W/CeO2 catalysts were synthesized by employing Ce-NO-R nanorods [Ce(NO3)3.6H2O as the precursor] and Ce-Cl-C nanocubes and Ce-Cl-R nanorods (CeCl3.7H2O as the precursor) as the supports, and their structures and catalytic performances in NOx removal were investigated. TEM results demonstrate that the morphology of the CeO2 species is associated with the Ce precursor. The activity results show that the NOx conversion in Mn-W/Ce-NO-R is greater than 96% at 150 °C, which is much higher than those in Mn-W/Ce-Cl-R and Mn-W/Ce-Cl-C. At the same time, Mn-W/Ce-NO-R exhibits strong SO2 tolerance and excellent H2O resistance. DFT modeling shows that NO adsorbs over Mn-W/Ce-NO-R{110} by forming ONO*, whereas NO prefers to adsorb on the O vacancies in Mn-W/Ce-Cl-C{100}. Moreover, the superior catalytic performance of Mn-W/Ce-NO-R is associated with its greater amounts of surface Ce3+,/sup> and Mn,sup>4+ species, surface acid sites, and active oxygen species, resulting in the promotion of the reactions according to the Langmuir-Hinshelwood and Eley-Rideal mechanisms. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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