Li Didi, Wang Zhen, Jin Shiqing, Zhu Minghui
State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
Chem Bio Eng. 2024 Jan 13;1(6):541-547. doi: 10.1021/cbe.3c00072. eCollection 2024 Jul 25.
Achieving a high dispersion of the supported catalyst is crucial for heterogeneous catalysts. However, such a goal is difficult to attain for copper-based catalysts with conventional preparation methods, especially at higher yet industrial-related loadings. In this study, we explore an oxidation-reduction treatment for reconstruction of supported copper catalysts, promoting the redispersion of large Cu nanoparticles. Oxidation of the reduced Cu/AlO catalyst turns large Cu nanoparticles into a hollow structure, which is attributed to the Kirkendall effect. The following reduction step produces reduced Cu nanoparticles with smaller diameters and an increased number of active sites. Such an oxidation-reduction treatment results in a remarkable two-fold increase in the activity of the Cu/AlO catalyst, as compared to the untreated one, toward the methanol steam reforming reaction. Our findings present an innovative approach for the improvement of the catalyst dispersion, holding great promise for heterogeneous catalytic applications.
对于多相催化剂而言，实现负载型催化剂的高分散至关重要。然而，采用传统制备方法，尤其是在较高的与工业相关的负载量下，对于铜基催化剂来说，很难实现这一目标。在本研究中，我们探索了一种氧化还原处理方法，用于负载型铜催化剂的重构，促进大尺寸铜纳米颗粒的再分散。还原后的Cu/AlO催化剂氧化后，大尺寸铜纳米颗粒转变为空心结构，这归因于柯肯达尔效应。随后的还原步骤产生了直径更小且活性位点数量增加的还原态铜纳米颗粒。与未经处理的催化剂相比，这种氧化还原处理使Cu/AlO催化剂对甲醇蒸汽重整反应的活性显著提高了两倍。我们的研究结果提出了一种改善催化剂分散性的创新方法，在多相催化应用方面具有巨大潜力。
