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首页> 外文期刊>Advances in Environmental Technology >Evaluation of LaBO3 (B=Mn, Cr, Mn0.5Cr0.5) perovskites in catalytic oxidation of trichloroethylene
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Evaluation of LaBO3 (B=Mn, Cr, Mn0.5Cr0.5) perovskites in catalytic oxidation of trichloroethylene

机译：LaBO3（B = Mn，Cr，Mn0.5Cr0.5）钙钛矿在三氯乙烯催化氧化中的评价

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In this study, La–Mn–Cr perovskite-type catalysts were synthesized as LaMnO3,LaCrO3, and LaMn0.5Cr0.5O3 by a microwave-assisted gel-combustion method. They were then calcined at 600oC for 5h in air. X-ray diffraction (XRD) analysis indicated that the crystalline perovskite phase is the dominant phase formed in all the synthesized samples. The scanning electron microscopy (SEM) analysis showed that the perovskites have a full spongy and porous structure. The specific surface area (BET) analysis showed a specific surface area of about 12.4-26.8 m2/g, and the highest specific surface area belonged to the LaMn0.5Cr0.5O3 perovskite. Moreover, the highest oxygen mobility revealed by the temperature-programmed desorption of oxygen (O2–TPD) analysis was related to the LaMn0.5Cr0.5O3 sample. The catalytic activity of the synthesized perovskites in catalytic oxidation of 1000 ppm trichloroethylene (TCE) in air was investigated at different temperatures. The substituted perovskite (LaMn0.5Cr0.5O3) with the highest BET specific surface area and the highest oxygen mobility yielded the best catalytic performance among the probed perovskites.
机译：在这项研究中，La-Mn-Cr钙钛矿型催化剂通过微波辅助凝胶燃烧法合成为LaMnO3，LaCrO3和LaMn0.5Cr0.5O3。然后将它们在600oC的空气中煅烧5小时。 X射线衍射（XRD）分析表明，钙钛矿相是所有合成样品中形成的主要相。扫描电镜（SEM）分析表明钙钛矿具有完整的海绵状和多孔结构。比表面积（BET）分析显示比表面积为约12.4-26.8m2 / g，并且最高比表面积属于LaMn0.5Cr0.5O3钙钛矿。此外，通过程序升温的氧气脱附（O2-TPD）分析揭示的最高氧气迁移率与LaMn0.5Cr0.5O3样品有关。在不同温度下，研究了合成钙钛矿在空气中氧化1000 ppm三氯乙烯（TCE）时的催化活性。 BET比表面积最高和氧迁移率最高的取代钙钛矿（LaMn0.5Cr0.5O3）在所探测的钙钛矿中产生了最佳的催化性能。

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