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

doi:10.1016/S1872-2067(18)63112-2

Abstract

Abstract:

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.

Key words: CO oxidation, Stability, Moisture, Hydrophobicity, Supported Wacker catalyst

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.

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https://www.cjcatal.com/EN/Y2018/V39/I9/1560

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

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