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Strong metal–support interactions on gold nanoparticle catalysts achieved through Le Chatelier’s principle
Nature Catalysis ( IF 37.8 ) Pub Date : 2021-05-10 , DOI: 10.1038/s41929-021-00611-3
Hai Wang , Liang Wang , Dong Lin , Xiang Feng , Yiming Niu , Bingsen Zhang , Feng-Shou Xiao

Strong metal–support interactions (SMSIs) are crucial for the preparation of supported metal catalysts. A prevailing view is that the redox feature of the metal oxide support is the driving force behind SMSI construction. Herein we demonstrate CO2-induced SMSIs between irreducible oxide MgO and noble gold nanoparticles, presenting electronic and geometric features that are similar to those of classical SMSIs. The key to these interactions is activating the oxide surface by a reversible reaction, MgO + CO2 MgCO3, which leads to migration of the support onto the gold nanoparticles to form thin overlayers. The overlayer is permeable to the reactant molecules, stable under the oxidation conditions and even water tolerant, resulting in sinter-resistant gold nanoparticle catalysts. This investigation provides an approach for the rational design and optimization of supported metal catalysts based on irreducible oxides, and deepens our understanding of the mechanism of SMSI formation.



中文翻译:

通过 Le Chatelier 原理实现的金纳米颗粒催化剂上的强金属-载体相互作用

强金属-载体相互作用(SMSI)对于制备负载型金属催化剂至关重要。一种普遍的观点是,金属氧化物载体的氧化还原特性是 SMSI 构建背后的驱动力。在这里,我们展示了 CO 2诱导的不可还原氧化物 MgO 和贵重金纳米颗粒之间的 SMSIs,呈现出与经典 SMSIs 相似的电子和几何特征。这些相互作用的关键是通过可逆反应激活氧化物表面,MgO + CO 2  MgCO 3,这导致载体迁移到金纳米颗粒上以形成薄覆盖层。覆盖层可渗透反应物分子,在氧化条件下稳定,甚至耐水,从而产生耐烧结的金纳米颗粒催化剂。该研究为基于束缚氧化物的负载型金属催化剂的合理设计和优化提供了一种途径,加深了我们对SMSI形成机理的理解。

更新日期:2021-05-10
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