The performance of Ag doped V2O5-TiO2 catalyst on the catalytic oxidation of gaseous elemental mercury

Songjian Zhao; Yongpeng Ma; Zan Qu

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The performance of Ag doped V2O5-TiO2 catalyst on the catalytic oxidation of gaseous elemental mercury

机译：Ag掺杂的V2O5-TIO2催化剂在气态元素汞的催化氧化上的性能

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To improve the catalytic oxidation ability for gaseous elemental mercury (Hg~0), silver was introduced to V2O5-TiO2 catalysts. The catalysts were prepared by an impregnation method with various additives to obtain well distributed silver nanoparticles on the carrier. It was found that doping silver onto V2O5-TiO2 can significantly improve the catalytic oxidation efficiency of Hg~0, and the redox temperature range for Hg~0 oxidation was enlarged markedly (150-450 °C). The addition of polyvinylpyrrolidone (PVP) during the preparation of the catalysts can improve the dispersion of silver nanoparticles more effectively, which resulted in a higher Hg~0 oxidation efficiency up to 90%. However, the oxidation of Hg~0 on the catalyst was slightly inhibited due to the larger silver nanoparticles when the ionic liquid (IL) [bmim][BF4] was used as the additive. The characterization results indicated that V can be induced to a higher oxidation state in the presence of silver nanoparticles, and the transformation trend of TiO2 from the anatase to rutile phase caused by Ag can be minimized in the presence of PVP or ILs. Meanwhile, the mechanisms of the elemental mercury oxidation at various temperature ranges were discussed.

机译：为了提高气态元素汞（Hg〜0）的催化氧化能力，将银引入V2O5-TIO2催化剂中。催化剂是通过一种浸渍方法制备的，具有各种添加剂，以在载体上获得分布良好的银纳米颗粒。发现在V2O5-TIO2上掺杂银可以显着提高Hg〜0的催化氧化效率，并且Hg〜0氧化的氧化还原温度范围显着膨胀（150-450°C）。在催化剂制备过程中，添加聚乙烯吡咯烷酮（PVP）可以更有效地改善银纳米颗粒的分散体，从而导致高达90％的Hg〜0氧化效率。然而，当离子液体（IL）[BMIM] [BF4]用作添加剂时，由于较大的银纳米颗粒，催化剂上Hg〜0的氧化被略微抑制。表征结果表明，在存在银纳米颗粒的情况下，可以将V诱导到较高的氧化态，并且在PVP或ILS存在下，可以将TIO2从解剖酶变为金红石阶段的转化趋势可以最小化。同时，讨论了各种温度范围内元素汞氧化的机制。

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来源
《Catalysis science & technology》 |2014年第11期|4036-4044|共9页
作者
Songjian Zhao; Yongpeng Ma; Zan Qu;
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作者单位

School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, PR China.;

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正文语种英语
中图分类汉语教学;
关键词
Povidone; CATALYTIC OXIDATION; Oxidationimpregnation methodTEMPERATURE RANGENano-silverCatalystsSilverAdditivesOxidation State;

机译：povidone;催化氧化;氧化浸泡方法温度rangenano-silvercatalystssilveradditivesivesivesatives氧化态;

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The performance of Ag doped V2O5-TiO2 catalyst on the catalytic oxidation of gaseous elemental mercury

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