Highly Effective Pd/MgO/γ-Al2O3 Catalysts for CO Oxidative Coupling to Dimethyl Oxalate: The Effect of MgO Coating on γ-Al2O3
| Autor: | Yang Lin, Zhendong Pan, Liu Hao, Xiaoping Wang, Donge Wang, Wei Qu, Wang Shuaiqi, Zhijian Tian, Huaijun Ma, Congxin Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Metal chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Transmission electron microscopy visual_art Desorption visual_art.visual_art_medium General Materials Science Oxidative coupling of methane 0210 nano-technology Dimethyl oxalate Incipient wetness impregnation Nuclear chemistry |
| Zdroj: | ACS Applied Materials & Interfaces. 13:28064-28071 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.1c04051 |
| Popis: | The support of MgO/γ-Al2O3 was initially prepared by a multiple impregnation method and Pd was placed on the surface of the MgO/γ-Al2O3 support via incipient wetness impregnation. Pd/MgO/γ-Al2O3 (Pd/MAO) catalysts were systematically characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), CO2-temperature-programmed desorption (TPD), transmission electron microscopy (TEM), CO-Fourier transform infrared (CO-FTIR), and X-ray photoelectron spectroscopy (XPS) and tested in the CO oxidative coupling to dimethyl oxalate (DMO) reaction. Compared to Pd/γ-Al2O3, the catalytic activities of the Pd/MAO catalysts improved significantly. The Pd/MAO catalyst with a 30% mass ratio of Mg to γ-Al2O3 delivers 3 times higher STY of DMO than that of Pd/γ-Al2O3. It has been demonstrated that MgO covered γ-Al2O3 layer-by-layer forming MAO supports, which can increase surface basicity and the interaction between Pd particles and the MAO supports. Moreover, the relationship between metal and support interaction and catalytic performance was discussed. |
| Databáze: | OpenAIRE |
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