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首页> 外文期刊>Catalysis science & technology >The performance and mechanism of Ag-doped CeO2/TiO2 catalysts in the catalytic oxidation of gaseous elemental mercury
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The performance and mechanism of Ag-doped CeO2/TiO2 catalysts in the catalytic oxidation of gaseous elemental mercury

机译：气体元素汞催化氧化中Ag掺杂的CEO2/TIO2催化剂的性能和机制

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摘要

To improve the ability of CeO2/TiO2 catalysts to catalyze the oxidation of gaseous elemental mercury, silver was introduced. Doping with Ag can significantly enhance the Hg-0 oxidation ability of CeO2/TiO2. In addition, the temperature window was widened (from 150 to 450 degrees C). The catalysts were characterized by TEM, XRD, XPS and H-2-TPR. The results indicated that silver nanoparticles can be loaded on the TiO2 support. The catalysts had better crystallization and higher redox ability after addition of silver. Silver existed mostly in its metallic state, which can keep Ce in a higher Ce(IV) state. HCl was oxidized into active Cl by CeO2 and then was adsorbed on the silver nanoparticles. In addition to the HCl and Hg-0 breakthrough experiments, a Hg-0 desorption experiment and a Cl-2 yield experiment were conducted to study the catalytic mechanisms of elemental mercury oxidation over various temperature ranges; these experiments indicated that the reaction followed the Langmuir-Hinshelwood mechanism at low temperature, and the Eley-Rideal mechanism and homogeneous gas-phase reaction at high temperature. Furthermore, a mercury valence state change experiment was performed, which indicated that HCl was the major catalytic oxidization component.
机译：为了提高CEO2/TIO2催化剂催化气态元素汞的氧化能力，引入了银。用AG掺杂可以显着增强CEO2/TIO2的HG-0氧化能力。另外，温度窗口宽度（从150度到450度）。催化剂的特征是TEM，XRD，XPS和H-2-TPR。结果表明，银纳米颗粒可以加载在TIO2支持上。催化剂加入银后具有更好的结晶和更高的氧化还原能力。白银主要存在于其金属状态，可以使CE保持更高的CE（IV）状态。 HCl通过CEO2氧化为活性CL，然后被吸附在银纳米颗粒上。除了HCL和HG-0突破实验外，还进行了HG-0解吸实验和CL-2产量实验，以研究各种温度范围内元素汞氧化的催化机制。这些实验表明，该反应遵循低温下的Langmuir-Hinshelwood机制，以及在高温下的Eley-Rideal机制和均匀的气相反应。此外，进行了汞状态变化实验，这表明HCl是主要的催化氧化成分。

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