Interfacial structure-governed SO2 resistance of Cu/TiO2 catalysts in the catalytic oxidation of CO,Catalysis Science & Technology

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Interfacial structure-governed SO2 resistance of Cu/TiO2 catalysts in the catalytic oxidation of CO
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020/01/29 , DOI: 10.1039/c9cy02405k
Weiwei Yang _{1,

2,

3,

4,

5} , Li Li _{1,

2,

3,

4,

5} , Yarong Fang _{1,

2,

3,

4,

5} , Yulong Shan _{6,

7,

8,

9} , Jue Xu _{1,

2,

3,

4,

5} , Huan Shen _{1,

2,

3,

4,

5} , Yunbo Yu _{6,

7,

8,

9} , Yanbing Guo _{1,

2,

3,

4,

5} , Hong He _{6,

7,

8,

9}

Affiliation

Three types of Cu–Ti interfacial structures have been fabricated by using different preparation methods. The mechanism regarding the interfacial effect on oxidation of CO and resistance to SO₂ has been elaborated. It is proposed that an O vacancy-steered catalytic oxidation of CO prevails over an in situ Cu-doped TiO₂ (DT) catalyst while a lattice O-initiated one proceeds on the other two catalysts that are obtained via solvent free and mechanical mixing methods. The former catalyst exhibits a strong Cu–Ti interface due to the high dispersion of copper species on TiO₂ and partial incorporation of Cu²⁺ into the TiO₂ matrix. This not only creates rich O vacancies, enhances O mobility and thus leads to superior redox ability of DT, hence promoting CO oxidation, but also restricts the interaction of SO₂ with strongly-anchored Cu²⁺ species and thus increases the SO₂ tolerance of DT. Meanwhile, the latter two catalysts have aggregated CuO either above or inside TiO₂, which leads to rapid sulfation of CuO and deactivation of the catalysts.

中文翻译：

Cu / TiO2催化剂在CO催化氧化过程中界面控制的SO2耐受性

通过使用不同的制备方法已制备出三种类型的Cu-Ti界面结构。已经阐明了关于CO氧化的界面作用和抗SO ₂的机理。建议在原位掺杂Cu的TiO ₂（DT）催化剂上使用O空位控制的CO催化氧化，而通过无溶剂和机械混合方法获得的另两种催化剂则采用晶格O引发的催化剂进行。。前者的催化剂表现出很强的Cu-Ti界面，这是由于铜物种在TiO ₂上的高度分散以及Cu ²⁺部分掺入TiO _2中矩阵。这不仅会产生丰富的O空位，增强O的迁移率，从而导致DT优异的氧化还原能力，从而促进CO氧化，而且限制了SO ₂与强锚定Cu ²⁺物种的相互作用，从而提高了SO _2的耐受性。 DT。同时，后两种催化剂在TiO ₂上方或内部聚集了CuO ，这导致CuO快速硫酸化和催化剂失活。

更新日期：2020-03-26

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