The competition between SO2 and elemental mercury (Hg0) for active sites was an important factor for suppressing the Hg0 oxidation properties of catalysts. There were obvious differences in properties of basicity and acidity between SO2 and Hg0. Raising the SO2 resistance via adjusting the basicity and acidity sites of catalysts was promising for reducing the competition between SO2 and Hg0. This study aimed to form multiple active sites with different basicities via Cu, Fe, Mn, and Sn doping. The results indicated that Cu doping had the best modification performance. Five percent CuO doping could significantly improve the SO2 resistance of CuO(5)-CeO2(5)-WO3(9)/TiO2 and increase the mercury oxidation efficiency (MOE) from 54.7 to 85.5% in the condition (6% O2, 100 ppm NO, 100 ppm NH3, and 100 ppm SO2). CO2 temperature-programmed desorption analysis showed that CuO(5)-CeO2(5)-WO3(9)/TiO2 exhibited weak basic sites (CeO2), medium-strong basic sites (Cu-O-Ce), and strong basic sites (CuO). Therefore, the CuO in the Ce-O-Cu structure was prioritized for the reaction with acid gas SO2 and protected CeO2 from SO2 poisoning. This study prepared a highly SO2-resistant catalyst for Hg0 oxidation. This research and development will be conducive for use in Hg0 oxidation in actual coal-fired flue gases.

中文翻译：

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通过使用CuO掺杂方法调整碱度和酸度位点来提高CeO2（5）-WO3（9）/ TiO2催化Hg0氧化的SO2耐受性。

SO2和元素汞（Hg0）之间的竞争活性位点是抑制催化剂Hg0氧化性能的重要因素。SO 2和Hg 0之间的碱度和酸度性质存在明显差异。通过调节催化剂的碱性和酸性位点来提高SO2的耐受性有望减少SO2和Hg0之间的竞争。这项研究旨在通过掺杂Cu，Fe，Mn和Sn形成具有不同碱度的多个活性位点。结果表明，Cu掺杂具有最佳的改性性能。5％的CuO掺杂可以显着提高CuO（5）-CeO2（5）-WO3（9）/ TiO2的SO2耐受性，并将汞氧化效率（MOE）从54.7提高到85.5％（6％O2，100） ppm NO，100 ppm NH3和100 ppm SO2）。二氧化碳温度程序解吸分析表明，CuO（5）-CeO2（5）-WO3（9）/ TiO2表现出弱碱性位点（CeO2），中强碱性位点（Cu-O-Ce）和强碱性位点（ CuO）。因此，优先考虑将Ce-O-Cu结构中的CuO与酸性气体SO2反应，并保护CeO2免受SO2中毒。这项研究为Hg0氧化制备了高度抗SO2的催化剂。这项研究和开发将有利于实际燃煤烟气中的Hg0氧化。