研究报告
于国峰,顾月平,金瑞奔.Mn/TiO2和Mn-Ce/TiO2低温脱硝催化剂的抗硫性研究[J].环境科学学报,2013,33(8):2149-2157
Mn/TiO2和Mn-Ce/TiO2低温脱硝催化剂的抗硫性研究
- Effects of SO2 on the low-temperature SCR Mn/TiO2 and Mn-Ce/TiO2 catalysts
- 基金项目：浙江省环境污染控制研究重点实验室资助项目
- 作者
- 单位
- 于国峰
- 浙江浙能长兴发电有限公司, 湖州 313000
- 顾月平
- 浙江浙能长兴发电有限公司, 湖州 313000
- 金瑞奔
- 浙江省环境保护科学设计研究院, 杭州 310007
- 摘要：在低温选择性催化还原(SCR)反应条件下考察了烟气残余SO2对Mn/TiO2和Mn-Ce/TiO2催化剂选择性催化还原活性的影响,同时对SO2的影响机理进行了探讨.结果发现,Mn/TiO2催化剂在SO2反应气氛中失活很快,硫铵盐的沉积和活性组分的硫酸化是催化剂失活的重要原因;Ce的加入可以有效地抑制催化剂活性组分的硫酸化,同时还能降低硫酸盐在催化剂表面的稳定性,从而可以提高催化剂的抗硫性.
- Abstract：Under conditions of low temperature SCR reaction, the effects of SO2 on the SCR activity of Mn/TiO2 and Mn-Ce/TiO2 catalysts as well as its mechanism were investigated in detail in this paper. It was found that Mn/TiO2 catalyst would deactivate quickly in the SO2 reaction atmosphere. The deposition of ammonium sulfate species on catalyst surface and the sulfation of catalyst active phase were proven to be the main reasons for the catalyst deactivation in the presence of SO2 during SCR reaction. The addition of Ce could effectively inhibit the sulfation of catalyst active phase and decrease the stability of the formed sulfate species.
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