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Tunable preparation of highly dispersed Ni _x Mn-LDO catalysts derived from Ni _x Mn-LDHs precursors and application in low-temperature NH₃-SCR reactions.

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 Ni₅Mn-LDO exhibited above 90% NO _x conversion and N₂ selectivity at a temperature zone of 180-360 °C. Besides, Ni₅Mn-LDO possessed considerable SO₂ & H₂O 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 Ni₆MnO₈, while their particle sizes showed significant differences. Notably, the uniform distribution of active species particles in the Ni₅Mn-LDO catalyst provided the rich surface acidity and suitable redox ability which were the primary causes for its desirable DeNO _x property.

SUBMITTER: Hou B

PROVIDER: S-EPMC9069834 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Tunable preparation of highly dispersed Ni x Mn-LDO catalysts derived from Ni x Mn-LDHs precursors and application in low-temperature NH3-SCR reactions.

Hou Benhui B Du Yali Y Liu Xuezhen X Ci Chao C Wu Xu X Xie Xianmei X

RSC advances 20190806 42

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 w ...[more]

PMID: 35527889

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Project description:The group has shown that Baiyun Ebo rare earth concentrate has excellent performance in NH3-SCR denitrification when used as a carrier, where rare earth elements are mainly present in cerium fluorocarbon ore (CeCO3F) and monazite (CePO4) mineral phases. In this paper, a new low-temperature NH3-SCR catalyst of Mn-Fe/CeCO3F-monazite was prepared by an impregnation method, using synthetic CeCO3F and purified monazite as carriers. By exploring its denitrification performance and mechanistic analysis, it provides theoretical guidance for the use of rare earth concentrates as low-temperature NH3-SCR catalysts. Our previous studies have determined the optimum loading of Fe, so this paper needs to be investigated for the optimum doping ratio of the active substance Mn. The results of the activity tests, XRD and BET have determined that the best denitrification rate and catalytic performance was achieved at a ratio of Mn : Ce of 1 : 5. The denitrification activity of the different catalysts was investigated by loading Fe, Mn and Fe and Mn together. The results obtained by means of experimental analyses such as XRD, SEM, BET and activity tests showed that the composite catalyst loaded with Fe and Mn at the same time, had the highest activity and its denitrification rate could reach 94.8% at 250 °C. This is mainly attributed to the fact that the interaction of Fe, Mn can promote the dispersion of each other on the carrier surface, which greatly improves the specific surface area of the catalyst. The introduction of Fe and Mn increases the acidic sites and the amount of acid on the catalyst surface, which results in the formation of a large number of oxygen vacancies and the presence of more oxygen species on the catalyst surface, which facilitate the migration of oxygen. The new catalyst was investigated by Fourier transform infrared (FTIR) spectroscopy to characterise the adsorption and transformation behaviour of the reactive species on the surface of the catalyst, and to investigate the reaction mechanism. The results showed that the entire reaction process followed the L-H mechanism, with the gaseous NO adsorption and activation on the catalyst surface generating bidentate nitrate, bridging nitrate species and NH3/NH4 + species as the main intermediate species involved in the reaction, both of which underwent redox reactions on the catalyst surface to produce N2 and H2O. The above results indicated that the CeCO3F-monazite carrier has excellent performance, and provided a theoretical basis for the high-value utilization of rare earth concentrates.

Dataset Information

Tunable preparation of highly dispersed Ni _x Mn-LDO catalysts derived from Ni _x Mn-LDHs precursors and application in low-temperature NH₃-SCR reactions.

Publications

Tunable preparation of highly dispersed Ni <sub><i>x</i></sub> Mn-LDO catalysts derived from Ni <sub><i>x</i></sub> Mn-LDHs precursors and application in low-temperature NH<sub>3</sub>-SCR reactions.

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