Effect of strontium substitution on the activity of La2?xSrxNiO4 (x = 0.0–1.2) in NO decomposition |
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| Authors: | Zhu JunJiang Yang XiangGuang Xu XueLian Wei KeMei |
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| Affiliation: | (1) National Research Center of Chemical Fertilizer Catalysts, Fuzhou University, Fuzhou, 350002, China;(2) Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China;(3) College of Chemistry & Chemical Engineering, Fuzhou University, Fuzhou, 350002, China |
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| Abstract: | The aim of this work is to study the effect of Sr substitution on the redox properties and catalytic activity of La2−x Sr x NiO4 (x = 0.0–1.2) for NO decomposition. Results suggest that the x = 0.6 sample shows the highest activity. The characterization (TPD, TPR, etc.) of samples indicates that the x = 0.6 sample possesses suitable abilities in both oxidation and reduction, which facilitates the proceeding of oxygen desorption and NO adsorption. At temperature below 700°C, the oxygen desorption is difficult, and is the rate-determining step of NO decomposition. With the increase of reaction temperature (T > 700°C), the oxygen desorption is favorable and, the active adsorption of NO on the active site (NO + V o + Ni2+ → NO−-Ni3+) turns out to be the rate-determining step. The existence of oxygen vacancy is the prerequisite condition for NO decomposition, but its quantity does not relate much to the activity. Supported by the National Hi-Tech Research and Development Program of China (863 Program)(Grant No. 2004CB 719502) and the National Natural Science Foundation of China (Grant No. 20177022) |
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| Keywords: | NO decomposition La2− x Sr x NiO4 TPD TPR oxygen vacancy |
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