• 关键词：二氧化硫  氧化氮  低温选择性催化还原  锰  铜  铈  二氧化钛  暂态响应

• 基金项目：湖南省自然科学基金(No.05JJ40090)

• 伍斌
• 1. 攀枝花学院生物与化学工程学院, 攀枝花 617000; 2. 湘潭大学环境工程系, 湘潭 411105

• 黄妍
• 湘潭大学环境工程系, 湘潭 411105

• 郑毅
• 攀枝花学院生物与化学工程学院, 攀枝花 617000

• 童志权
• 湘潭大学环境工程系, 湘潭 411105

• 摘要：研究了SO₂对Mn-Cu-Ce/TiO₂选择催化还原NO的影响,并采用傅立叶变换红外光谱、X射线衍射光谱及暂态响应技术对Mn-Cu-Ce/TiO₂催化剂的SO₂中毒机理进行了探讨.结果表明,SO₂可强吸附在Mn-Cu-Ce/TiO₂表面的CuO活性位上,并生成CuSO₄,由于CuSO₄在低温时对SCR反应有抑制作用,因而,催化剂的活性下降;暂态响应实验结果表明,Mn-Cu-Ce/TiO₂催化剂上的SCR反应主要遵循Langmuir-Hinshelwood机理.通过对催化剂进行硫酸化或NO预吸附,可以消除SO₂对Mn-Cu-Ce/TiO₂的毒害作用.

• Abstract：The effect of SO₂ on the selective catalytic reduction(SCR) of NOwith NH₃ over a Mn-Cu-Ce/TiO₂ catalyst and its mechanism were investigated by Fourier transform infrared spectroscopy,X-ray diffraction and transient response experiments.SO₂ is strongly absorbed on Mn-Cu-Ce/TiO₂ at the CuO active sites.The absorbed SO₂ will react with CuO to form CuSO₄,which will inhibit SCRat low temperature.Transient response experiments suggested that SCR over Mn-Cu-Ce/TiO₂ follows the Langmuir-Hinshelwood mechanism.The effect of SO₂ on Mn-Cu-Ce/TiO₂ could be alleviated by sulphurating the catalyst or pre-absorbing NO on the catalyst.

• Key words：sulfur dioxide  nitrogen oxide  selective catalytic reduction at low temperature  copper  manganese  cerium  titania  transient response

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