A MnOx@Eu-CeOx nanorod catalyst with multiple protective effects: Strong SO2-tolerance for low temperature DeNO(x) processes
A MnOx@Eu-CeOx nanorod catalyst with multiple protective effects: Strong SO2-tolerance for low temperature DeNO(x) processes
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具有多重保护作用的MnOx@Eu-CeOx纳米棒催化剂：对低温DeNO(x)过程具有很强的SO2耐受性
DOI：
10.1016/j.jhazmat.2020.123011
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发表时间：
2020
影响因子：
13.6
通讯作者：
Zhiyong Zhong
中科院分区：
文献类型：
--
作者：
Chenglong Yu;Dan Hou;Bichun Huang;Meijuan Lu;Ruosi Peng;Zhiyong Zhong
采用化学沉淀法设计并制备了具有多种保护特性的新型MnOx@Eu-CeOxcatalyst，并对其低温SCR活性进行了测试。研究对象MnOx@Eu-CeOxnanorod催化剂表现出优异的SCR性能和较强的二氧化硫耐受性。复合壳结构的形成提高了催化剂的表面酸度和氧化还原性能，从而获得了优异的SCR性能。此外，热重分析结果表明，euox - ceox复合壳的保护作用有效地减少了表面硫酸盐的沉积。该催化剂的XPS、XRD分析结果以及理论计算有力地证明了MnOx@Eu-CeOx中Mn和Ce之间存在很强的相互作用。这种显著的相互作用可以最大限度地保护核心免受SO2的影响，这也有助于催化剂的高抗SO2性。原位红外光谱结果还表明，与Eu-CeOx/MnOx相比，MnOx@Eu-CeOxwere上的化学吸附物质在so2存在下更加稳定，这导致硫酸盐的沉积明显减少。该低温SCR催化剂具有复合壳、强相互作用和核壳结构等多重保护属性，是长期抗SO2的关键。
A novel MnOx@Eu-CeOxcatalyst with multiple protective attributes was designed and fabricated using a chemical precipitation method and tested for its low temperature SCR activity. The subject MnOx@Eu-CeOxnanorod catalyst exhibited superior SCR performance and strong SO2-tolerance. The formation of the composite-shell structure enhanced the catalysts' surface acidity and redox performance, which resulted in excellent SCR performance. Moreover, the TG results suggested that the protective effect of the EuOx-CeOxcomposite-shell effectively reduced the deposition of the surface sulphates. The XPS, XRD analysis results of the subject catalyst together with theoretical calculations provided strong evidence that there was a strong interaction between Mn and Ce in the MnOx@Eu-CeOx. This significant interaction could provide maximum protection to the core from the effect of SO2, which also contributed to the high SO2resistance of the catalyst.In situFT-IR results also indicated that the chemisorbed species on MnOx@Eu-CeOxwere much more stable in the presence of SO2compared to Eu-CeOx/MnOx, which resulted in the deposition of significantly less sulphates. This low temperature SCR catalyst with multiple protective attributes, including composite shell, strong interaction and core-shell structure, is the key to long-term resistance to SO2.