Direct Identification of Active Surface Species for the Water–Gas Shift Reaction on a Gold–Ceria Catalyst
- Xin-Pu Fu (1559050)
- Li-Wen Guo (6432890)
- Wei-Wei Wang (1626301)
- Chao Ma (207385)
- Chun-Jiang Jia (1534531)
- Ke Wu (320733)
- Rui Si (1537279)
- Ling-Dong Sun (1426702)
- Chun-Hua Yan (1426708)
DOIAbstract
The crucial role of the metal–oxide interface in the catalysts of the water–gas shift (WGS) reaction has been recognized, while the precise illustration of the intrinsic reaction at the interfacial site has scarcely been presented. Here, two kinds of gold–ceria catalysts with totally distinct gold species, <2 nm clusters and 3 to 4 nm particles, were synthesized as catalysts for the WGS reaction. We found that the gold cluster catalyst exhibited a superiority in reactivity compared to gold nanoparticles. With the aid of comprehensive in situ characterization techniques, the bridged −OH groups that formed on the surface oxygen vacancies of the ceria support are directly determined to be the sole active configuration among various surface hyd...
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