In this work, sulfation effect on NH₃-SCR performance over CeO₂ with different morphology (nanocubes and nanorods) was carefully studied. A morphology-sensitive sulfation effect on NH₃-SCR activity was observed on CeO₂. Interestingly, the NO removal efficiencies of CeO₂ nanocubes and CeO₂ nanorods got greatly enhanced after the sulfation at low-temperature range (< 350 °C). CeO₂ nanorods exhibited a much higher NH₃-SCR activity than that of CeO₂ cubes. However, compared to CeO₂ nanocubes, CeO₂ nanorods suffered from a severe deactivation when sulfated at higher temperatures (> 350 °C). A series of characterizations such as N₂ adsorption–desorption, XRD, HR-TEM, TG–DTA, Raman and in situ DRIFTS of SO₂ + O₂ adsorption were conducted to investigate the interactions between SO₂ and nano-shaped CeO₂. It was revealed that the morphology of CeO₂ nanorods was damaged severely when sulfated at high temperature (> 350 °C), while the structure of CeO₂ nanocubes was relatively stable under the same condition. Furthermore, more sulfate species were found on CeO₂ nanorods than on CeO₂ nanocubes, in particular of bulk like sulfate species. As a result, the NO removal efficiency of CeO₂ nanorods declined greatly when sulfated at high temperature.

在这项工作中，仔细研究了硫酸盐对具有不同形态（纳米立方和纳米棒）的CeO ₂上NH ₃ -SCR性能的影响。在CeO ₂上观察到形态敏感的硫酸盐化作用，对NH ₃ -SCR活性有影响。有趣的是，铈的NO去除率₂纳米立方体和的CeO ₂纳米棒在低温度范围内（<350℃）的硫酸化后得到了大幅度的提高。CeO ₂纳米棒表现出比CeO ₂立方体高得多的NH ₃ -SCR活性。但是，与CeO ₂纳米立方体相比，CeO ₂当在较高温度（> 350°C）下硫酸化时，纳米棒会严重失活。进行了N ₂吸附-解吸，XRD，HR-TEM，TG-DTA，拉曼和SO ₂  + O ₂吸附原位DRIFTS等一系列表征，研究了SO ₂与纳米状CeO ₂的相互作用。据透露，铈的形态₂时在高温（> 350℃）的硫酸化的纳米棒被严重破坏，同时的CeO结构₂纳米立方体相对相同的条件下是稳定的。此外，在CeO ₂纳米棒上发现的硫酸盐种类比在CeO _2上更多纳米立方体，特别是大块的硫酸盐。结果，当在高温下硫酸化时，CeO ₂纳米棒的NO去除效率大大降低。