Abstract

A series of Cu-SSZ-13@CeO₂ catalysts with surface modification with CeO₂ was prepared by the modified self-resemble method based on the one-pot synthesized Cu-SSZ-13 catalyst and applied for the selective catalytic reduction of NO by NH₃. The low-temperature catalytic activity and the tolerance to SO₂ + H₂O of Cu-SSZ-13@CeO₂ were found to enhance markedly compared with Cu-SSZ-13. In parallel, the XRD, N₂-BET, H₂-TPR, SEM, XPS, and in situ DRIFTS were performed to characterize the catalysts. XRD and SEM results proved that the surface of Cu-SSZ-13 was covered by nanoparticles of CeO₂. XPS results further confirmed that Ce species were in the outer of the catalysts. N₂-BET indicated that the physical structure parameters of the Cu-SSZ-13@CeO₂ were changed obviously due to the coverage of CeO₂. H₂-TPR suggested that the redox properties of the Cu-SSZ-13@CeO₂ catalysts were improved compared to the unmodified Cu-SSZ-13. In situ DRIFTS results demonstrated that the intensities of the bands attributed to NH₃ and NO_x species on the surface of Cu-SSZ-13@CeO₂-2 enhanced due to the CeO₂ modification, which played an important role for the NH₃-SCR performance.

中文翻译：

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用CeO 2对Cu-SSZ-13进行表面改性，以提高对NH 3选择性还原NO的催化性能。

摘要

基于一锅合成Cu-SSZ-13催化剂，通过改进的自组装方法，制备了一系列用CeO ₂表面改性的Cu-SSZ-13 @ C​​eO ₂催化剂，并用于选择性催化还原NO。 NH ₃。与Cu-SSZ-13相比，发现Cu-SSZ-13 @ C​​eO ₂的低温催化活性和对SO ₂ + H ₂ O的耐受性显着提高。并行地，XRD，N ₂ -BET，H ₂ -TPR，SEM，XPS和原位DRIFTS进行以表征催化剂。XRD和SEM结果表明，Cu-SSZ-13的表面被CeO ₂纳米颗粒覆盖。。XPS结果进一步证实Ce种类在催化剂的外部。N ₂ -BET表明，由于CeO ₂的覆盖，Cu-SSZ-13 @ C​​eO ₂的物理结构参数发生了明显变化。H ₂ -TPR表明，与未改性的Cu-SSZ-13相比，Cu-SSZ-13 @ C​​eO ₂催化剂的氧化还原性能得到了改善。原位DRIFTS结果表明，由于CeO _2的修饰，Cu-SSZ-13 @ C​​eO ₂ -2表面上归因于NH ₃和NO _x的谱带强度增强，这对NH ₃发挥了重要作用。-SCR性能。