La的掺杂方式对CeO2-MnOx催化氧化氯苯性能的影响

采用共沉淀法制备CeO₂-MnO_x和La₂O₃-CeO₂-MnO_x催化剂，再用沉积-沉淀法制备La₂O₃/CeO₂-MnO_x催化剂，并对催化剂的氯苯催化氧化反应活性进行检测。结果表明，La的加入可以显著提高催化剂催化氧化氯苯的活性。XRD和TPR表征结果表明，La的加入抑制CeO₂晶粒尺寸的长大，增强CeO₂的晶格应变，并促进Mn进入CeO₂的晶相，形成较好的MnCeO_x固溶体。催化剂的热稳定性评价结果表明，La的加入有效提高CeO₂-MnO_x催化剂的热稳定性。

Influence of different La doping methods on performance of CeO2-MnOx catalysts for chlorobenzene oxidation

CeO₂-MnO_x and La₂O₃-CeO₂-MnO_x catalysts were prepared by the co-precipitation method,and La₂O₃/CeO₂-MnO_x catalyst was prepared by the deposition-precipitation method.Their catalytic activity for chlorobenzene oxidation were investigated.The results showed that doping La in CeO₂-MnO_x could improve its catalytic activity of the catalyst for chlorobenzene oxidation.The results of XRD and TPR analysis indicated that the presence of La in CeO₂-MnO_x not only restrained the growth of CeO₂ crystalline grains and enhanced the microstrain of CeO₂ crystal lattice,but promoted Mn ions incorporation in CeO₂ lattice and formed a homogeneous MnCeO_x solid solution as well.The results of thermal stability evaluation of the catalyst illustrated that doping La in CeO₂-MnO_x catalyst could effectively improve its thermal stability.