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采用超声波增强的浸溃法合成了组成优化的CeO2-TiO2 (CeTi)催化剂.在200℃,模拟烟气条件下研究了SO2对CeTi催化剂上单质汞(Hg0)催化氧化的影响.结果表明:纯N2条件下,SO2抑制了CeTi催化剂上Hg0的氧化;有O2条件下SO2既可以促进Hg0的氧化,也可以抑制Hg0的氧化,取决于烟气中SO2的浓度.低浓度的SO2在O2的协助下可以促进Hg0的氧化,而高浓度的SO2抑制了Hg0的氧化.实验条件下,SO2本身不具有氧化Hg0的能力,其对Hg0氧化的促进作用源于其在CeTi催化剂表面反应生成的SO3等活性物质.SO2对Hg0氧化的抑制作用归因于SO2与Hg0间的竞争吸附,SO2抑制了Hg0的吸附从而抑制了Hg0的进一步氧化.

参考文献

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