Influence of preparation conditions to structure property, NOx and SO2 sorption behavior of the BaFeO3 − x perovskite catalyst |
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Authors: | Hui XianFeng-Li Li Xin-Gang Li Xing-Wen ZhangMing Meng Tian-Yong ZhangNoritatsu Tsubaki |
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Affiliation: | a Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering & Technology, Tianjin University, Tianjin, 300072, PR Chinab Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama city, Toyama 930-8555, Japan |
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Abstract: | A series of the BaFeO3 − x perovskite catalysts was synthesized by a sol-gel method using citric acid and/or EDTA as complexants with a purpose to improve their sulfur-resistance by forming a uniform perovskite structure at a low calcination temperature, i.e. 750 °C. The thermogravimetry results show that almost no carbonate was formed after calcination of the xerogel precursor with the complexants' molar ratio of CA/EDTA ≤ 1.5, which was convinced by the in situ DRIFT spectra results of the Ba-Fe-1 catalyst during the SO2/O2 sorption. It indicates that, after adding EDTA into the complexants, the metal ions of the raw material could be mixed homogeneously and react stoichiometrically by calcination at 750 °C to form a uniform perovskite structure. Accordingly, the obtained Ba-Fe-1 perovskite presented a performed sulfur-resistance. Moreover, the seriously damaged structure of the BaFeO3 − x perovskite by reduction could be in situ regenerated by calcination under lean conditions at 400 °C, which is within the operating temperature zone of the aftertreatment system of diesel to meet the real commercial demands. |
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Keywords: | Perovskite BaFeO3 &minus x NOx storage Sulfur-resistance Regeneration |
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