Abstract Majority of catalysts for simultaneous removal of NO and Hg0 from coal-fired flue gas generally suffered from the deactivation by SO2. In this work, a facile method was developed for controllable synthesis of SiO2@FeOx-CeOx/CNTs (noted as SiO2@FeCeOx/CNTs) catalyst with a unique core-shell construction for DeNOx and Hg0 removal in the flue gas with the presence of SO2. The prepared SiO2@FeCeOx/CNTs exhibited high stability and excellent SO2 tolerance. Although the addition of 500 ppm SO2 has a little adverse influence on the catalytic activity of SiO2@FeCeOx/CNTs, its NO and Hg0 removal efficiencies remained (89.52 ± 2.01)% and (82.73 ± 2.04)% at 240C and 30,000 h−1, which are (15.44 ± 2.86) and (16.13 ± 2.86) percentage points higher than uncoated FeCeOx/CNTs. It can be observed that large amounts of crystal FeSO4, amorphous ammonium sulfate and ammonium sulfite formed on the spent FeCeOx/CNTs. For the SiO2@FeCeOx/CNTs core-shell catalyst, the coated SiO2 shell establish an available barrier to hinder the generation of FeSO4 and restrain the reduction of chemisorbed oxygen, improving its stability and SO2 tolerance. Therefore the core-shell structure is a feasible way to develop the SO2 tolerance catalysts during the simultaneous NH3-SCR and removal of Hg0.

中文翻译：

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通过涂覆外壳 SiO2 提高 FeCeOx/CNTs 催化剂的 SO2 耐受性，用于去除 NO 和 Hg0

摘要 燃煤烟气中同时脱除 NO 和 Hg0 的大部分催化剂普遍存在 SO2 失活问题。在这项工作中，开发了一种简便的方法来可控合成 SiO2@FeOx-CeOx/CNTs（记为 SiO2@FeCeOx/CNTs）催化剂，该催化剂具有独特的核壳结构，可在二氧化硫。制备的 SiO2@FeCeOx/CNTs 表现出高稳定性和优异的 SO2 耐受性。尽管添加 500 ppm SO2 对 SiO2@FeCeOx/CNTs 的催化活性有一点不利影响，但其 NO 和 Hg0 去除效率在 240C 和 30,000 h-1 时保持 (89.52 ± 2.01)% 和 (82.73 ± 2.04)% ，比未涂层的 FeCeOx/CNT 高 (15.44 ± 2.86) 和 (16.13 ± 2.86) 个百分点。可以观察到大量的晶体 FeSO4，在用过的 FeCeOx/CNT 上形成无定形硫酸铵和亚硫酸铵。对于 SiO2@FeCeOx/CNTs 核壳催化剂，包覆的 SiO2 壳建立了一个可用的屏障，以阻止 FeSO4 的生成并抑制化学吸附氧的还原，提高其稳定性和 SO2 耐受性。因此，核壳结构是在同时进行 NH3-SCR 和 Hg0 去除过程中开发 SO2 耐受催化剂的可行方法。