Promotion effect and mechanism of MnOx doped CeO2 nano-catalyst for NH3-SCR. Issue 4 (March 2020)

• Record Type: Journal Article
• Authors: Yang, Chen; Yang, Jian; Jiao, Qingrui; Zhao, Dong; Zhang, Yuxin; Liu, Lan; Hu, Guang; Li, Jiangling
• Is Part Of: Ceramics international. Volume 46:Issue 4(2020)
• Page Start: 4394
• Page End: 4401
• Publication Date: 2020-03
• Subjects: MnOx-CeO2 -- SCR -- De-NO -- Promotion effect -- Mechanism; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.10.163
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: MnO x -CeO2 (denoted as Mn–Ce) nanorod and MnO x -CeO2 nanooctahedra catalysts were synthesized by the hydrothermal method and were used for selective catalytic reduction of NO with NH3 . The catalytic performance tests showed that the NO removal efficiency of CeO2 catalysts was obviously improved after loading MnO x . The structure and properties of catalysts had been characterized by SEM、TEM、XRD、BET、XPS、H2 -TPR、NH3 -TPD and in situ DRIFTS. It was found that Mn–Ce catalyst were of uniform core-shell structure, higher concentrations of Mn 4+ and Ce 3+, better reducibility, the increase of weak acid sites. The results of in situ DRIFTS indicated that the NH3 -SCR reaction should obey the E–R mechanism. Moreover, the promotion effect and mechanism of MnO x doped CeO2 was demonstrated, which improved the catalytic activity of Mn–Ce catalysts.