Journal ArticleDOI
Direct Identification of Active Surface Species for the Water–Gas Shift Reaction on a Gold–Ceria Catalyst
Xin-Pu Fu,Li-Wen Guo,Wei-Wei Wang,Chao Ma,Chun-Jiang Jia,Ke Wu,Rui Si,Ling-Dong Sun,Chun-Hua Yan +8 more
TLDR
A very clear image of the surface reaction for the WGS reaction catalyzed by the gold-ceria catalyst is obtained and it is proved that the reaction between bridged surface -OH groups and CO molecules adsorbed on interfacial Au atoms contributes dominantly to the W GS reactivity.Abstract:
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 hydroxyls in the gold–ceria catalysts. The isotopic tracing results further proved that the reaction between bridged surface −OH groups and CO molecules adsorbed on interfacial Au atoms contributes dominantly to the WGS reactivity. Thus, the abundant interfacial sites in g...read more
Citations
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Journal ArticleDOI
Supported Noble-Metal Single Atoms for Heterogeneous Catalysis.
TL;DR: The structure-activity relationships and the underlying catalytic mechanisms are addressed, including the influences of surface species and reducibility of supports on the activity and stability, impact of the unique structural and electronic properties of single-atom centers modulated by metal/support interactions on catalytic activity and selectivity, and how the modified catalytic mechanism obtained by inhibiting the multiatoms involves catalytic pathways.
Journal ArticleDOI
Insights into interface engineering in steam reforming reactions for hydrogen production
TL;DR: In this article, a review describes how the interface structure can be rationally designed and functionalized and how these atomic-level engineering approaches help to promote the efficiency of hydrogen production in steam reforming reactions of carbon-based chemicals.
Journal ArticleDOI
Strong metal–support interactions on gold nanoparticle catalysts achieved through Le Chatelier’s principle
TL;DR: In this paper, a CO2-induced strong metal-support interaction between irreducible oxide MgO and noble gold nanoparticles has been demonstrated, which is crucial for the preparation of supported metal catalysts.
Journal ArticleDOI
Decoupling the effect of Ni particle size and surface oxygen deficiencies in CO2 methanation over ceria supported Ni
TL;DR: In this paper, the effect of surface oxygen vacancies and Ni particle size in the CO2 methanation over CeO2 supported Ni nanoparticles was decoupled, and a structure-sensitivity in the reaction over Ni/CeO2 was established without the interference of different concentrations of surface VO vacancies, where the turnover frequencies of CO2 decreased with increasing Ni nanoparticle sizes (8−21 nm).
Journal ArticleDOI
Dynamic structure of active sites in ceria-supported Pt catalysts for the water gas shift reaction
Yuanyuan Li,Matthew Kottwitz,Joshua L. Vincent,Michael J. Enright,Zongyuan Liu,Lihua Zhang,Jiahao Huang,Sanjaya D. Senanayake,Wei-Chang Yang,Peter A. Crozier,Ralph G. Nuzzo,Ralph G. Nuzzo,Anatoly I. Frenkel,Anatoly I. Frenkel +13 more
TL;DR: In this paper, the dynamic characteristics of a Pt/CeO2 system at the atomic level for the water gas shift (WGS) reaction were investigated and the synergistic effects of metal-support bonding at the perimeter region were revealed.
References
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Journal ArticleDOI
Active Nonmetallic Au and Pt Species on Ceria-Based Water-Gas Shift Catalysts
TL;DR: It is reported here that for the class of nanostructured gold– or platinum–cerium oxide catalysts, which are active for the water-gas shift reaction, metal nanoparticles do not participate in the reaction.
Journal ArticleDOI
Shape-selective synthesis and oxygen storage behavior of ceria nanopolyhedra, nanorods, and nanocubes.
Hao-Xin Mai,Ling-Dong Sun,Ya-Wen Zhang,Rui Si,Wei Feng,Hongpeng Zhang,Haichao Liu,Chun-Hua Yan +7 more
TL;DR: Oxygen storage capacity (OSC) measurements at 400 degrees C revealed that the oxygen storage takes place both at the surface and in the bulk for the as-obtained CeO2 nanorods and nanocubes, but is restricted at thesurface for the nanopolyhedra just like the bulk one, which suggests that high OSC materials might be designed and obtained by shape-selective synthetic strategy.
Journal ArticleDOI
Water Gas Shift Catalysis
Chandra Ratnasamy,Jon P. Wagner +1 more
TL;DR: In this paper, a review of the development of water gas shift (WGS) catalysis, especially during the last decade, is reviewed. And a critical review of WGS reaction mechanism is also presented.
Journal ArticleDOI
Activity of CeOx and TiOx Nanoparticles Grown on Au(111) in the Water-Gas Shift Reaction
José A. Rodriguez,José A. Rodriguez,José A. Rodriguez,Shuguo Ma,Shuguo Ma,Shuguo Ma,Ping Liu,Ping Liu,Ping Liu,Jan Hrbek,Jan Hrbek,Jan Hrbek,John Evans,John Evans,John Evans,M. Pérez,M. Pérez,M. Pérez +17 more
TL;DR: The high performance of Au-CeO2 and Au-TiO2 catalysts in the water-gas shift (WGS) reaction (H2O + CO→H2 + CO2) relies heavily on the direct participation of the oxide in the catalytic process.
Journal ArticleDOI
Probing defect sites on CeO2 nanocrystals with well-defined surface planes by Raman spectroscopy and O2 adsorption.
TL;DR: In this study, ceria nanocrystals with well-defined surface planes have been synthesized and utilized for studying defect sites with both Raman spectroscopy and O(2) adsorption, and the stability and reactivity of these oxygen species are found to be surface-dependent.