Highly dispersed single metal atom or cluster catalysts have attracted increasing attention because of improved atomic efficiency, higher reactivity and better selectivity. However, these catalysts on oxide supports often sinter to form large particles at high temperatures, which can lead to reduced surface areas and decreased catalytic activities, and are a major challenge to the development of optimal low temperature-active and sinter-resistant catalysts. Two kinds of platinum (Pt) clusters on titanium dioxide (TiO₂) supports are successfully prepared in this study to investigate the low temperature activity towards carbon monoxide (CO) oxidation as well as thermal stability of the resulting catalyst; highly oxidized Pt clusters demonstrated higher catalytic activity and thermal stability towards CO oxidation as compared with lower oxidized Pt clusters, since the high oxidation state of the catalytic metal active sites is believed to be highly correlated with the electronic metal-support interactions (EMSI) between Pt and TiO₂ support, and the results suggest that EMSI tailors the unoccupied 5d state of Pt species, thus greatly leading to the high activity and thermal stability.

由于提高了原子效率，提高了反应性和提高了选择性，高度分散的单金属原子或簇状催化剂引起了越来越多的关注。然而，这些氧化物载体上的催化剂经常在高温下烧结形成大颗粒，这可能导致表面积减小和催化活性降低，并且对于开发最佳的低温活性和抗烧结性催化剂是主要挑战。二氧化钛（TiO ₂上的两种铂（Pt）簇）在本研究中成功制备了载体，以研究对一氧化碳（CO）氧​​化的低温活性以及所得催化剂的热稳定性；与低氧化的Pt团簇相比，高氧化的Pt团簇表现出更高的催化活性和对CO氧化的热稳定性，因为人们认为催化金属活性位点的高氧化态与金属之间的电子金属-载体相互作用（EMSI）高度相关。 Pt和TiO ₂支持，结果表明EMSI对Pt物种的空位5 d状态进行了剪裁，从而极大地提高了活性和热稳定性。