吸附物介导的强金属-载体相互作用(A-SMSI)提供了一种可逆的方法来改变负载型金属催化剂的选择性,从而为方便调节催化性能提供了有力的工具。然而,对A-SMSI的基本理解仍然不足,调整A-SMSI的方法仍处于起步阶段,阻碍其在反应条件下的稳定。这里,我们报道,氧化物载体中氧空位的初始浓度在调节Ru纳米颗粒和缺陷二氧化钛(TiO2-x)之间的A-SMSI中起关键作用。基于这种新的认识,我们证明了在反应条件下原位形成A-SMSI,避免通常需要的富含CO2的预处理。形成的A-SMSI层在各种温度下表现出显著的稳定性,使优秀的活动,催化反向水煤气变换反应的选择性和长期稳定性。这项研究加深了对A-SMSI的理解,在反应条件下稳定A-SMSI的能力代表了实际催化应用的关键步骤。
The adsorbate-mediated strong metal-support interaction (A-
SMSI) offers a reversible means of altering the selectivity of supported metal catalysts, thereby providing a powerful tool for facile modulation of catalytic performance. However, the fundamental understanding of A-
SMSI remains inadequate and methods for tuning A-
SMSI are still in their nascent stages, impeding its stabilization under reaction conditions. Here, we report that the initial concentration of oxygen vacancy in oxide supports plays a key role in tuning the A-
SMSI between Ru nanoparticles and defected titania (TiO2-x). Based on this new understanding, we demonstrate the in situ formation of A-SMSI under reaction conditions, obviating the typically required CO2-rich pretreatment. The as-formed A-
SMSI layer exhibits remarkable stability at various temperatures, enabling excellent activity, selectivity and long-term stability in catalyzing the reverse water gas-shift reaction. This study deepens the understanding of the A-
SMSI and the ability to stabilize A-
SMSI under reaction conditions represents a key step for practical catalytic applications.