Highly Effective Pd/MgO/γ-Al2O3 Catalysts for CO Oxidative Coupling to Dimethyl Oxalate: The Effect of MgO Coating on γ-Al2O3,ACS Applied Materials & Interfaces

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Highly Effective Pd/MgO/γ-Al2O3 Catalysts for CO Oxidative Coupling to Dimethyl Oxalate: The Effect of MgO Coating on γ-Al2O3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-06-09 , DOI: 10.1021/acsami.1c04051
Lin Yang _{1,

2} , Zhendong Pan ₁ , Donge Wang ₁ , Shuaiqi Wang _{1,

2} , Xiaoping Wang _{1,

2} , Huaijun Ma ₁ , Hao Liu ₁ , Congxin Wang ₁ , Wei Qu ₁ , Zhijian Tian _{1,

3}

Affiliation

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.

中文翻译：

用于 CO 氧化偶联至草酸二甲酯的高效 Pd/MgO/γ-Al ₂ O ₃催化剂：MgO 涂层对 γ-Al ₂ O _{3 的影响}

MgO/γ-Al ₂ O ₃载体最初采用多重浸渍法制备，Pd通过初湿浸渍法置于MgO/γ-Al ₂ O ₃载体表面。Pd/MgO/γ-Al ₂ O ₃ (Pd/MAO) 催化剂通过 X 射线衍射 (XRD)、Brunauer-Emmett-Teller (BET)、CO _{2 程序}升温脱附 (TPD)、透射电子显微镜 (TEM)、CO-傅立叶变换红外 (CO-FTIR) 和 X 射线光电子能谱 (XPS)，并在 CO 氧化偶联草酸二甲酯 (DMO) 反应中进行测试。与 Pd/γ-Al ₂ O _{3 相比}, Pd/MAO 催化剂的催化活性显着提高。Mg 与 γ-Al ₂ O ₃质量比为 30% 的 Pd/MAO 催化剂提供的 DMO 的 STY 是 Pd/γ-Al ₂ O _{3 的}3 倍。已经证明，MgO包覆γ-Al ₂ O ₃逐层形成MAO载体，这可以增加表面碱度和Pd颗粒与MAO载体之间的相互作用。此外，还讨论了金属和载体相互作用与催化性能之间的关系。

更新日期：2021-06-23

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