Refining Metal–Support Interactions via Surface Modification of Irreducible Oxide Support for Enhanced Complete Propane Oxidation,ACS Catalysis

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Refining Metal–Support Interactions via Surface Modification of Irreducible Oxide Support for Enhanced Complete Propane Oxidation
ACS Catalysis ( IF 11.3 ) Pub Date : 2024-07-17 , DOI: 10.1021/acscatal.4c01358
Yang You ₁ , Aijie Xu ₁ , Xuan Tang _{1,

2} , Yanglong Guo ₁ , Wangcheng Zhan ₁ , Li Wang ₁ , Sheng Dai ₂ , Yun Guo ₁

Affiliation

Regulating the metal–support interaction (MSI) of supported metal catalysts is critical to enhancing their catalytic performance. However, achieving direct control over the MSI by tuning the properties of irreducible oxide-supported supports remains a challenging task. In this study, we propose a surface modification strategy to refine the MSI on an irreducible MgAl₂O₄-supported Pt catalyst. By employing a facile H₂O₂ treatment to modify the support surface, the number of Brønsted acid sites on MgAl₂O₄ was successfully reduced. The MSI between Pt and MgAl₂O₄ is appropriately weakened, resulting in a higher proportion of metallic Pt species, while maintaining a high level of dispersion during the reaction. These metallic Pt species enhance the activation ability of C–H bonds in propane and facilitate the rapid consumption of intermediate species. Consequently, the complete propane oxidation reaction performance of H₂O₂-treated Pt/MgAl₂O₄ is significantly promoted, exhibiting an impressive increase in intrinsic activity of over 32-fold compared to traditional Pt/MgAl₂O₄.

中文翻译：

通过难还原氧化物载体的表面改性来精炼金属-载体相互作用以增强丙烷的完全氧化

调节负载型金属催化剂的金属-载体相互作用（MSI）对于提高其催化性能至关重要。然而，通过调整不可还原氧化物支撑载体的性能来实现对 MSI 的直接控制仍然是一项具有挑战性的任务。在这项研究中，我们提出了一种表面改性策略，以改善不可还原的 MgAl ₂ O ₄负载的 Pt 催化剂上的 MSI。通过采用简便的H ₂ O ₂处理来改性载体表面，成功地减少了MgAl ₂ O ₄上的布朗斯台德酸位点的数量。 Pt和MgAl ₂ O ₄之间的MSI被适当削弱，导致金属Pt物种比例更高，同时在反应过程中保持高水平的分散性。这些金属 Pt 物质增强了丙烷中 C-H 键的活化能力，并促进中间物质的快速消耗。因此，经H ₂ O ₂处理的Pt/MgAl ₂ O ₄的完全丙烷氧化反应性能显着提升，与传统的Pt/MgAl ₂ O ₄相比，其内在活性显着提高了32倍以上。

更新日期：2024-07-17

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