催化作用
纳米颗粒
氧化物
金属
多相催化
化学工程
化学
纳米晶
面(心理学)
氧气
材料科学
纳米技术
社会心理学
生物化学
人格
冶金
五大性格特征
心理学
有机化学
工程类
作者
Yunshang Zhang,Jin‐Xun Liu,Kun Qian,Aiping Jia,Dan Li,Lei Shi,Jun Hu,Junfa Zhu,Weixin Huang
标识
DOI:10.1002/ange.202101928
摘要
Abstract Strong metal–support interactions (SMSI) is an important concept in heterogeneous catalysis. Herein, we demonstrate that the Au‐TiO 2 SMSI of Au/TiO 2 catalysts sensitively depends on both Au nanoparticle (NP) sizes and TiO 2 facets. Au NPs of ca. 5 nm are more facile undergo Au‐TiO 2 SMSI than those of ca. 2 nm, while TiO 2 {001} and {100} facets are more facile than TiO 2 {101} facets. The resulting capsulating TiO 2− x overlayers on Au NPs exhibit an average oxidation state between +3 and +4 and a Au‐to‐TiO 2− x charge transfer, which, combined with calculations, determines the Ti:O ratio as ca. 6:11. Both TiO 2− x overlayers and TiO 2− x ‐Au interface exhibit easier lattice oxygen activation and higher intrinsic activity in catalyzing low‐temperature CO oxidation than the starting Au‐TiO 2 interface. These results advance fundamental understanding of SMSI and demonstrate engineering of metal NP size and oxide facet as an effective strategy to tune the SMSI for efficient catalysis.
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