Ce掺杂低钒V2O5-WO3/TiO2催化剂脱除烟气元素汞的研究

制备了Ce掺杂的低矾V₂O₅-WO₃/TiO₂催化剂，在模拟燃煤烟气条件下开展Hg⁰的脱除实验.结果表明该催化剂具有很好的Hg⁰脱除能力，在200～500℃的温度范围内能脱除烟气中95%的Hg⁰.催化剂表征结果表明，比表面积、 孔容和孔径与汞脱除能力没有显著相关性.XPS的结果表明，催化剂表面的Ce是以Ce⁴⁺的形式存在，有利于Hg⁰的脱除反应.抗硫抗水实验表明，H₂O会轻微抑制Hg⁰的脱除反应，主要原因是H₂O和Hg⁰在样品表面的竞争吸附；SO₂会促进Hg⁰的脱除反应，原因是SO₂能增加样品表面的酸吸附位且增加表面Hg⁰的吸附量.

Removal of gaseous elemental mercury over cerium doped low vanadium loading V2O5-WO3/TiO2 in simulated coal-fired flue gas

This paper discussed a recent study of mercury removal by gaseous hydrogen chloride over novel Ce doped low vanadium V2O5-WO3/TiO2 catalysts under a bench scale condition. The performances on Hg(0) removal over the catalyst were tested in simulated flue gas with 80-100 microg x m(-3) Hg(0), 8% O2, 10 x10(-6) HCl, 8% H2O, 800 x10(-6) SO2 and balanced with N2. Results showed that about 95% of Hg(0) could be removed. According to the characterization results, BET surface areas had not significant influence on catalytic performance. XPS results indicated that Ce4+ oxide was a mainly form in the catalysts surface, which was beneficial for Hg(0) removal reactions. Water vapor slightly inhibited Hg(0) removal efficiency, due to the competitive adsorption, however, SO2 promoted the oxidation reactions, resulting in higher removal efficiencies.