Effects of calcium substitute in LaMnO3 perovskites for NO catalytic oxidation

La1-x Cax MnO3 （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）,...

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Bibliographic Details
Published inJournal of rare earths Vol. 31; no. 2; pp. 119 - 123
Main Author 沈美庆 赵真 陈家浩 苏玉更 王军 王欣全
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.02.2013
Subjects
Activated
activated oxygen
Catalysis
Catalysts
La1–xCaxMnO3 perovskites
Mn4+ ions
monodentate nitrates
Nitrogen dioxide
NO oxidation
Oxidation
Rare earth metals
X-ray photoelectron spectroscopy
X-rays
X-射线衍射
X射线光电子能谱
催化氧化活性
掺杂
替代品
氧化钙
钙钛矿型氧化物
activated oxygen
NO oxidation
Mn4+ ions
monodentate nitrates
La1–xCaxMnO3 perovskites
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(12)60244-0

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Summary:La1-x Cax MnO3 （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 La0.9 Ca0.1 MnO 3 sample showed the maximum conversion of 82% at 300 oC. The monodentate nitrates played a crucial role for the formation of NO2 . The reducibility of Mn 4＋ ions and reactivity of activated oxygen were favorable for the catalytic performances of NO oxidation.
Bibliography:La 1–x Ca x MnO 3 perovskites NO oxidation monodentate nitrates Mn 4＋ ions activated oxygen
11-2788/TF
La1-x Cax MnO3 （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 La0.9 Ca0.1 MnO 3 sample showed the maximum conversion of 82% at 300 oC. The monodentate nitrates played a crucial role for the formation of NO2 . The reducibility of Mn 4＋ ions and reactivity of activated oxygen were favorable for the catalytic performances of NO oxidation.
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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60244-0