Co-benefit of Ag and Mo for the catalytic oxidation of elemental mercury
Co-benefit of Ag and Mo for the catalytic oxidation of elemental mercury
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Ag 和 Mo 对元素汞催化氧化的协同作用
DOI：
10.1016/j.fuel.2015.05.034
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发表时间：
2015-10
期刊：
影响因子：
7.4
通讯作者：
Xu, Haomiao
中科院分区：
文献类型：
--
作者：
Yan, Naiqiang;Huang, Wenjun;Chen, Wanmiao;Xu, Haomiao
银（Ag）和钼（Mo）复合催化剂对单质汞（Hg 0）的氧化性能明显提高，实验结果证实了Ag和Mo之间的协同作用。物理和化学表征表明，Ag（2%）-Mo-Ti催化剂表面存在Ag 0和Ag 2 MoO 4纳米粒子。添加银后，Mo-Ti的氧化能力增强，氧化还原温度降低。气相组分分析表明，HCl是催化剂的主要组分，在无O2存在的情况下，催化剂仍具有较高的氧化效率。Ag（2%）-Mo-Ti具有上级抗SO2性能。此外，还进行了Hg 0穿透、脱附和HCl预处理实验，探讨了Hg 0的催化氧化机理.结果表明，Ag对HCl和Hg 0有吸附作用，Mo和化学吸附氧对HCl有催化作用。吸附的活性氯随后与吸附的汞反应，其次是朗缪尔Hinshelwood机制在低温下。
The performance of catalyst-combining silver (Ag) and molybdenum (Mo) for elemental mercury (Hg0) oxidation was clearly improved, and the experimental results demonstrated the synergy between Ag and Mo. The physical and chemical characterizations indicated that Ag0and Ag2MoO4nanoparticles existed on the surface of TiO2for Ag(2%)–Mo–Ti. Furthermore, the oxidation ability of Mo–Ti was enhanced, and the redox temperature decreased after silver was added. The gas component analysis demonstrated that HCl was the main catalytic component, and the catalyst still had high oxidation efficiency when O2was nonexistent. Ag(2%)–Mo–Ti had a superior resistance toward SO2. Furthermore, Hg0breakthrough, desorption, and HCl pretreated experiments were conducted to investigate the catalytic mechanisms of Hg0oxidation. The results indicated that Ag had an absorbency role on HCl and Hg0, and Mo and chemical adsorption oxygen had a catalytic effect on HCl. Adsorbed active Cl subsequently reacted with adsorbed Hg0followed by the Langmuir Hinshelwood mechanism at low temperature.
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