Mechanochemical synthesis of a high-surface-area Pd/α-Al2O3 catalyst for CO oxidative coupling to dimethyl oxalate reaction,Catalysis Science & Technology

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Mechanochemical synthesis of a high-surface-area Pd/α-Al2O3 catalyst for CO oxidative coupling to dimethyl oxalate reaction
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2023-02-23 , DOI: 10.1039/d2cy01895k
Lin Yang _{1,

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

2} , Xiaoping Wang _{1,

2} , Huaijun Ma ₁ , Wei Qu ₁ , Zhijian Tian _{1,

3}

Affiliation

Mechanochemistry has emerged as a highly promising approach in the field of synthesizing catalytic materials. In this work, high-surface-area α-Al₂O₃ with abundant hydroxyls was synthesized by a mechanochemical method. The Pd/α-Al₂O₃ catalyst possessed high catalytic activity and excellent stability in CO oxidative coupling to dimethyl oxalate (DMO) reaction. Moreover, we provide a strategy to tune the interaction of Pd and α-Al₂O₃ support by modulating the number of hydroxyls of α-Al₂O₃. Detailed characterizations indicated that the surface hydroxyls of α-Al₂O₃ supports play an important role in inhibiting Pd nanoparticles aggregation and enhancing the interaction of Pd with the α-Al₂O₃ support. The optimized Pd/α-Al₂O₃ catalyst possessed high catalytic activity and excellent stability, delivering a space–time yield (STY) of DMO of 2663 g L⁻¹ h⁻¹, which is higher than that of the active Pd-based catalysts reported so far. This strategy provides a simple way for modulating the catalytic performance and also can be extended to other industrial applications.

中文翻译：

用于CO氧化偶联草酸二甲酯反应的高表面积Pd/α-Al2O3催化剂的机械化学合成

机械化学已成为合成催化材料领域中极具前景的方法。在这项工作中，通过机械化学方法合成了具有丰富羟基的高表面积α-Al ₂ O _{3 。}Pd/α-Al ₂ O ₃催化剂在CO氧化偶联草酸二甲酯(DMO)反应中具有高催化活性和优异的稳定性。此外，我们提供了一种策略，通过调节 α-Al ₂ O ₃的羟基数来调节 Pd 和 α-Al ₂ O ₃载体的相互作用。_{详细的表征表明，α-Al 2} O ₃的表面羟基_{载体在抑制Pd纳米粒子聚集和增强Pd与α-Al 2} O ₃载体的相互作用方面起重要作用。优化后的 Pd/α-Al ₂ O ₃催化剂具有高催化活性和优异的稳定性，DMO 的时空产率 (STY) 为 2663 g L ⁻¹ h ⁻¹，高于活性 Pd-迄今为止报道的基于催化剂。该策略为调节催化性能提供了一种简单的方法，也可以扩展到其他工业应用。

更新日期：2023-02-23

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