Improved sulfur-resistant ability on CO oxidation of Pd/Ce0.75Zr0.25O2 over Pd/CeO2-TiO2 and Pd/CeO2

被引：17

作者：

Shen Meiqing ^{[1
,2
,3
]}

Lin Fang ^{[1
]}

Wei Guangxi ^{[1
]}

Wang Jianqiang ^{[1
]}

Zhu Shaochun ^{[1
]}

机构：

[1] Tianjin Univ, Sch Chem Engn & Technol, State Educ Minist, Key Lab Green Chem Technol, Tianjin 300072, Peoples R China

[2] Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China

[3] Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China

来源：

JOURNAL OF RARE EARTHS | 2015年 / 33卷 / 01期

关键词：

Pd/Ce0.75Zr0.25O2; Pd/CeO2-TiO2; diesel oxidation catalyst; SO2; poison; XPS; rare earths; LOW-TEMPERATURE OXIDATION; CEO2; CATALYSTS; SO2; SITES; C3H6;

D O I：

10.1016/S1002-0721(14)60383-5

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The influence of sulfation on Pd/Ce0.75Zr0.25O2, Pd/CeO2-TiO2 and Pd/CeO2 was investigated. Physical structure and chemical properties of different catalysts were characterized by N-2 adsorption, X-ray diffraction (XRD), CO chemisorption, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and X-ray fluorescence (XRF). After 10 h SO2 sulfation, it was found that the decrement on CO oxidation catalytic activity was limited on Pd/Ce0.75Zr0.25O2 compared to Pd/CeO2-TiO2 and Pd/CeO2. It demonstrated that Pd/Ce0.75Zr0.25O2 was more sulfur resistant compared to the other two catalysts. After sulfur exposure, catalyst texture was not much influenced as shown by N-2 adsorption and XRD, and surface Pd atoms were poisoned indicated by CO chemisorption results. Pd/Ce0.75Zr0.25O2 and Pd/CeO2-TiO2 exhibited less sulfur accumulation compared to Pd/CeO2 in the sulfation process. Furthermore, XPS results clarified that surface sulfur amount, especially surface sulfates amount on the sulfated catalysts was more crucial for the deactivation in sulfur containing environment.

引用

页码：56 / 61

页数：6

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