Effects of calcium substitute in LaMnO3 perovskites for NO catalytic oxidation |
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| Authors: | SHEN Meiqing ZHAO Zhen CHEN Jiahao SU Yugeng WANG Jun WANG Xinquan |
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| Affiliation: | 1,* (1. Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China; 2. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China) |
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| Abstract: | La1–xCaxMnO3 (x=0–0.3) perovskite-type oxides were synthesized by citrate sol-gel method. The physical and chemical properties were characterized by X-ray diffraction (XRD), Brumauer-Emmett-Teller method (BET), X-ray photoelectron spectroscopy (XPS), NO+O2-TPD (temperature-programmed desorption), activated oxygen evaluation and H2-TPR (temperature-programmed reduction) technologies. The results showed that NO catalytic oxidation activity was significantly improved by Ca substitution, especially for lower temperature activity. The La0.9Ca0.1MnO3 sample showed the maximum conversion of 82% at 300 °C. The monodentate nitrates played a crucial role for the formation of NO2. The reducibility of Mn4+ ions and reactivity of activated oxygen were favorable for the catalytic performances of NO oxidation. |
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| Keywords: | La 1–x Ca x MnO 3 perovskites NO oxidation monodentate nitrates Mn 4＋ ions activated oxygen |
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