Citation: Li Wang, Xiaoqing Lu, Wei Wang, Wangcheng Zhan, Yanglong Guo, Yun Guo. Stability of Pd-Cu-Cl_x/Al₂O₃ catalyst for CO oxidation[J]. Chinese Journal of Catalysis, ;2018, 39(9): 1560-1567. doi: 10.1016/S1872-2067(18)63112-2 shu

Stability of Pd-Cu-Cl_x/Al₂O₃ catalyst for CO oxidation

Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

Received Date: 20 March 2018
Revised Date: 28 April 2018

Fund Project: This work was supported by the National Key Research and Development Program of China (2016YFC0204300), National Natural Science Foundation of China (21207037, 21333003, 21571061), the "Shu Guang" Project of the Shanghai Municipal Education Commission (12SG29), and the Commission of Science and Technology of Shanghai Municipality (15DZ1205305).

By taking advantage of silylanization, Al₂O₃ support was modified by organosilane and supported Pd-Cu-Cl_x/Al₂O₃ catalysts were prepared. The effects of hydrophobicity on catalyst stability during CO oxidation were investigated. The physicochemical properties and redox potential of the catalyst were characterized by N₂ adsorption-desorption, XRD, H₂-TPR, and XPS. In order to understand the relationship between the oxidation stability of CO and the presence of water, the CO oxidation mechanism was studied by in situ DRIFT. Support pretreatment markedly promoted catalyst stability during CO oxidation; CO conversion was 78% after 150 h at saturated humidity and freezing point. Modification led to an obvious decrease in chloride ion concentration and enhancement in hydrophobicity. The role of water in CO oxidation was complicated. The presence of water favored CO oxidation over active Pd⁺ species and Pd⁰ reoxidation by Cu²⁺ species. Meanwhile, water also inhibited the formation of the active Pd⁺ species and helped to produce carbonate species. Compared with the form of the carbonate species, the inhibition of water to produce active Pd⁺ species played the main detrimental role in catalyst stability.
- CO oxidation,
- Stability,
- Moisture,
- Hydrophobicity,
- Supported Wacker catalyst
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Stability of Pd-Cu-Cl_x/Al₂O₃ catalyst for CO oxidation