Dataset Information

Enhancing the low temperature NH₃-SCR activity of FeTiO _x catalysts via Cu doping: a combination of experimental and theoretical study.

ABSTRACT: A series of Fe _α Cu_1-α TiO _x catalysts with variable Cu doping amounts was directly synthesized by the sol-gel method and their catalytic performances were tested for the selective catalytic reduction of NO with ammonia. The highest activity was achieved on Fe_0.9Cu_0.1Ti catalyst. NO conversion was above 80% and N₂ selectivity exceeded 90% on this catalyst in the temperature range of 200-375 °C. High NO and NH₃ oxidation activities facilitated the high NH₃-SCR activities of the catalysts in the low temperature range, while too strong NH₃ oxidation ability resulted in the decline of NH₃-SCR activity. DFT calculations based on the Fe and Cu co-doping TiO₂ model showed that the barrier of NH₃ activation is dramatically reduced as compared to pure Fe doping. This is due to the lowered p-band of lattice O. However, such activated O will also strongly decrease the barrier for the dissociation of NH₂ to NH species, which will lead to the formation of N₂O. Both Brønsted and Lewis acid sites over Fe_0.9Cu_0.1Ti catalyst are involved in the NH₃-SCR reaction. The adsorption of NO _x is strong in the low temperature range, and large amounts of nitrates were decomposed on the catalyst surface in the high temperature range.

SUBMITTER: Cheng K

PROVIDER: S-EPMC9080720 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Enhancing the low temperature NH3-SCR activity of FeTiO x catalysts via Cu doping: a combination of experimental and theoretical study.

Cheng Kai K Song Weiyu W Cheng Ying Y Zheng Huiling H Wang Lu L Liu Jian J Zhao Zhen Z Wei Yuechang Y

RSC advances 20180524 34

A series of Fe α Cu1-α TiO x catalysts with variable Cu doping amounts was directly synthesized by the sol-gel method and their catalytic performances were tested for the selective catalytic reduction of NO with ammonia. The highest activity was achieved on Fe0.9Cu0.1Ti catalyst. NO conversion was above 80% and N2 selectivity exceeded 90% on this catalyst in the temperature range of 200-375 °C. High NO and NH< ...[more]

PMID: 35539667

Similar Datasets

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

Enhancing the low temperature NH₃-SCR activity of FeTiO _x catalysts via Cu doping: a combination of experimental and theoretical study.

Publications

Enhancing the low temperature NH<sub>3</sub>-SCR activity of FeTiO <sub><i>x</i></sub> catalysts <i>via</i> Cu doping: a combination of experimental and theoretical study.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets