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Ag-modified AgI-TiO2 as an excellent and durable catalyst for catalytic oxidation of elemental mercury

机译：Ag改性的AgI-TiO2是一种出色且持久的催化剂，用于元素汞的催化氧化

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摘要

AgI-TiO2 was employed for the removal of elemental mercury (Hg-0) from flue gas, and extra elemental silver (Ag) was introduced to enhance the catalytic activity and stability. AgI-TiO2 displayed an excellent effect on Hg-0 catalytic oxidation, and the Hg-0 oxidation efficiency was almost 100% with only 5 ppm HCl at 350 degrees C, which was better than that of KI-Ti. Adding Ag to AgI-TiO2 can notably prolong the period of high efficiency, and the Hg-0 oxidation efficiency was still above 90% after 10 h with only 2% Ag added. Doping with silver could suppress the decomposition of AgI and the loss of iodine, which maintains the stability of the catalyst performance. In addition, HCl was readily adsorbed and activated by the silver. The iodine in Ag(2%)-AgI-Ti mainly acted as an accelerant for Hg-0 oxidation by facilitating formation of the intermediate Hg-I*; then, chlorine can further convert the intermediate to HgCl2 as the final product. In addition, the thermogravimetric (TG) analysis proved that Ag(2%)-AgI-Ti showed a good stability at high temperature. Furthermore, the ion chromatogram tests also showed the chemical stability of AgI-Ti in the presence of Ag.
机译：用AgI-TiO2去除烟道气中的汞（Hg-0），并引入额外的银（Ag）以增强催化活性和稳定性。 AgI-TiO2对Hg-0催化氧化表现出优异的效果，在350℃下仅含5 ppm HCl的情况下，Hg-0的氧化效率几乎为100％，优于KI-Ti。向AgI-TiO2中添加Ag可以显着延长高效期，仅添加2％Ag的Hg-0氧化效率在10 h后仍高于90％。银的掺杂可以抑制AgI的分解和碘的损失，从而保持催化剂性能的稳定性。另外，HCl易于被银吸收并活化。 Ag（2％）-AgI-Ti中的碘主要通过促进中间体Hg-I *的形成而作为Hg-0氧化的促进剂。然后，氯气可将中间体进一步转化为最终产物HgCl2。此外，热重分析（TG）分析表明，Ag（2％）-AgI-Ti在高温下表现出良好的稳定性。此外，离子色谱图测试还显示了在Ag存在下AgI-Ti的化学稳定性。

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