Tuning the Catalytic Activity of Complex Metal Oxides Prepared by a One-Pot Method for NO Direct Decomposition
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-07-07
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en
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10
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Industrial and Engineering Chemistry Research, Volume 60, issue 26, pp. 9399–9408
Abstract
The complex metal oxides xLa-Sr-Co-Fe/MgO (x = 10-80 wt %) were prepared via a one-pot method for NO direct decomposition. The X-ray diffraction results show a gradual transformation of La-Sr-Co-Fe oxide from the Ruddlesden-Popper structure (A2BO4) to the perovskite structure (ABO3) with increasing x accompanied with Mg doping into the lattice of La-Sr-Co-Fe oxide. The NO direct decomposition activity decreases with x when x ≤ 60% and then increases with further loading. The 10% La-Sr-Co-Fe/MgO sample shows high activity and high oxygen resistance with a NO conversion to N2 of ∼46% in the presence of 10% O2 at 850 °C (W/F = 1.5 g s/cm3). Several characterization techniques have been employed to reveal the composition-structure-activity relationship. The MgO component increases the sintering resistance of catalysts, and thus, the surface area increases with the MgO content. The reducibility of Co/Fe species, content of oxide ion vacancies at the surface, mobility of lattice oxygen, and content of NO sorption decrease with x for x ≤ 60% and then increase with a further increase in x, which are responsible for the activity variation.Description
Funding Information: This work was funded by the National Natural Science Foundation of China (grant no. 51702230) and the program of Innovative Research Teams in Universities (no. IRT 0641). Publisher Copyright: © 2021 American Chemical Society.
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Wei, M, Xie, P, Yong, X, Li, Y & Zhang, C 2021, ' Tuning the Catalytic Activity of Complex Metal Oxides Prepared by a One-Pot Method for NO Direct Decomposition ', Industrial and Engineering Chemistry Research, vol. 60, no. 26, pp. 9399–9408 . https://doi.org/10.1021/acs.iecr.1c00950