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首页> 外文期刊>RSC Advances >Enhancement of resistance to chlorine poisoning of Sn-modified MnCeLa catalysts for chlorobenzene oxidation at low temperature
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Enhancement of resistance to chlorine poisoning of Sn-modified MnCeLa catalysts for chlorobenzene oxidation at low temperature

机译：增强Sn修饰的MnCeLa催化剂在低温下对氯苯氧化的耐氯中毒性

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In this article, MnCeLa and Sn-MnCeLa mixed oxide catalysts prepared by a sol-gel and coprecipitation method were evaluated for the catalytic combustion of chlorobenzene (CB), which was employed as a model compound for volatile organic chlorinated aromatics. The activity tests revealed that both catalysts presented an excellent activity in catalytic destruction of CB showing 90% conversion below 210 degrees C. A considerably higher stability was observed for the Sn-MnCeLa catalyst compared with the MnCeLa sample, indicating that the catalytic stability of the MnCeLa catalyst for chlorobenzene oxidation could be significantly enhanced via the introduction of Sn. X-ray photoelectron spectroscopy (XPS) demonstrated that Sn modification can increase the concentration of surface reactive oxygen species, which is critical to remove Cl species. Additionally, Raman and hydrogen temperature programmed reduction (H-2-TPR) showed that the addition of Sn inhibited the formation of MnOxCly on the active sites of the MnCeLa catalyst. These two aspects are responsible for the remarkably improved resistance to chlorine poisoning of the Sn-modified MnCeLa catalyst.
机译：在本文中，对通过溶胶-凝胶法和共沉淀法制备的MnCeLa和Sn-MnCeLa混合氧化物催化剂的氯苯（CB）催化燃烧进行了评估，该氯苯用作挥发性有机氯化芳烃的模型化合物。活性测试表明，两种催化剂在CB的催化破坏方面均表现出出色的活性，在210℃以下显示90％的转化率。与MnCeLa样品相比，Sn-MnCeLa催化剂观察到更高的稳定性，表明该催化剂的催化稳定性。通过引入Sn可以显着增强MnCeLa催化剂用于氯苯氧化。 X射线光电子能谱（XPS）表明，Sn修饰可以增加表面活性氧的浓度，这对于去除Cl至关重要。另外，拉曼和氢程序升温还原（H-2-TPR）表明，Sn的添加抑制了MnCeLa催化剂活性位上MnOxCly的形成。这两个方面是锡改性的MnCeLa催化剂对氯中毒的抵抗力显着提高的原因。

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