Tunable preparation of highly dispersed NixMn-LDO catalysts derived from NixMn-LDHs precursors and application in low-temperature NH3-SCR reactions. Issue 42 (6th August 2019)

• Record Type: Journal Article
• Authors: Hou, Benhui; Du, Yali; Liu, Xuezhen; Ci, Chao; Wu, Xu; Xie, Xianmei
• Is Part Of: RSC advances. Volume 9:Issue 42(2019)
• Page Start: 24377
• Page End: 24385
• Publication Date: 2019-08-06
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra04578c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The Ni x Mn-LDO catalysts derived from Ni x Mn-LDHs precursors with uniform distribution of active species particles exhibited outstanding DeNO x performance. Abstract : A series of Ni x Mn bimixed metal oxides (Ni x Mn-LDO) were prepared via calcining Ni x Mn layered double hydroxides (Ni x Mn-LDHs) precursors at 400 °C and applied as catalysts in the selective catalytic reduction (SCR) of NO x with NH3 . The DeNO x performance of catalysts was optimized by adjusting the Ni/Mn molar ratios of Ni x Mn-LDO precursors, in which Ni5 Mn-LDO exhibited above 90% NO x conversion and N2 selectivity at a temperature zone of 180–360 °C. Besides, Ni5 Mn-LDO possessed considerable SO2 & H2 O resistance and outstanding stability. Multiple characterization techniques were used to analyze the physicochemical properties of the catalysts. The analysis results indicated that all catalysts had the same active species Ni6 MnO8, while their particle sizes showed significant differences. Notably, the uniform distribution of active species particles in the Ni5 Mn-LDO catalyst provided the rich surface acidity and suitable redox ability which were the primary causes for its desirable DeNO x property.