Interface Engineering of Gold Nanoclusters for CO Oxidation Catalysis

2018 ◽  
Vol 10 (35) ◽  
pp. 29425-29434 ◽  
Author(s):  
Yingwei Li ◽  
Yuxiang Chen ◽  
Stephen D. House ◽  
Shuo Zhao ◽  
Zahid Wahab ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Gold Nanoclusters ◽  
Oxidation Catalysis ◽  
Interface Engineering

Tuning the Activities of Cu2O Nanostructures via the Oxide-Metal Interaction

2019 ◽  
Author(s):  
Wugen Huang ◽  
qingfei liu ◽  
Zhiwen Zhou ◽  
Yangsheng Li ◽  
Yong Wang ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Catalysis ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Oxidation Reactions ◽  
Tunneling Microscopy ◽  
Temperature Oxidation ◽  
Metal Interaction ◽  
Tremendous Importance ◽  
Oxygen Atoms

Despite tremendous importance in catalysis, the design and improvement of the oxide- metal interface has been hampered by the limited understanding on the nature of interfacial sites, as well as the oxide-metal interaction (OMI). Through the construction of well-defined Cu<sub>2</sub>O-Pt, Cu<sub>2</sub>O-Ag, Cu<sub>2</sub>O-Au interfaces, we found that Cu<sub>2</sub>O Nanostructures (NSs) on Pt exhibit much lower thermal stability than on Ag and Au, although they show the same surface and edge structures, as identified by element-specific scanning tunneling microscopy (ES-STM) images. The activities of the Cu<sub>2</sub>O-Pt and Cu<sub>2</sub>O-Au interfaces for CO oxidation were further compared at the atomic scale and showed in general that the interface with Cu<sub>2</sub>O NSs could annihilate the CO-poisoning problem suffered by Pt group metals and enhance the interaction with O<sub>2</sub>, which is a limiting step for CO oxidation catalysis on group IB metals. While both interfaces could react with CO at room temperature, the OMI was found to determine the reactivity of supported Cu<sub>2</sub>O NSs by 1) tuning the activity of interfacial oxygen atoms and 2) stabilizing oxygen vacancies or vice versa, the dissociated oxygen atoms at the interface. Our study provides new insight for OMI and for the development of Cu-based catalysts for low temperature oxidation reactions.

Tuning the Activities of Cu2O Nanostructures via the Oxide-Metal Interaction

2019 ◽  
Author(s):  
Wugen Huang ◽  
Yangsheng Li ◽  
Yong Wang ◽  
Yunchuan Tu ◽  
Dehui Deng ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Catalysis ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Oxidation Reactions ◽  
Tunneling Microscopy ◽  
Temperature Oxidation ◽  
Metal Interaction ◽  
Tremendous Importance ◽  
Oxygen Atoms

Despite tremendous importance in catalysis, the design and improvement of the oxide- metal interface has been hampered by the limited understanding on the nature of interfacial sites, as well as the oxide-metal interaction (OMI). Through the construction of well-defined Cu<sub>2</sub>O-Pt, Cu<sub>2</sub>O-Ag, Cu<sub>2</sub>O-Au interfaces, we found that Cu<sub>2</sub>O Nanostructures (NSs) on Pt exhibit much lower thermal stability than on Ag and Au, although they show the same surface and edge structures, as identified by element-specific scanning tunneling microscopy (ES-STM) images. The activities of the Cu<sub>2</sub>O-Pt and Cu<sub>2</sub>O-Au interfaces for CO oxidation were further compared at the atomic scale and showed in general that the interface with Cu<sub>2</sub>O NSs could annihilate the CO-poisoning problem suffered by Pt group metals and enhance the interaction with O<sub>2</sub>, which is a limiting step for CO oxidation catalysis on group IB metals. While both interfaces could react with CO at room temperature, the OMI was found to determine the reactivity of supported Cu<sub>2</sub>O NSs by 1) tuning the activity of interfacial oxygen atoms and 2) stabilizing oxygen vacancies or vice versa, the dissociated oxygen atoms at the interface. Our study provides new insight for OMI and for the development of Cu-based catalysts for low temperature oxidation reactions.

Template-free mesoporous La0.3Sr0.7Ti1-xFexO3±δ for CH4 and CO oxidation catalysis

2019 ◽  
Vol 245 ◽  
pp. 536-545 ◽  
Author(s):  
Buğra Kayaalp ◽  
Siwon Lee ◽  
Kurt Klauke ◽  
Jongsu Seo ◽  
Luca Nodari ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Catalysis ◽  
Template Free

Gold Supported on La2O3: Structure and Reactivity with CO2 and Implications for CO Oxidation Catalysis

2008 ◽  
Vol 112 (48) ◽  
pp. 18973-18983 ◽  
Author(s):  
M. Mihaylov ◽  
E. Ivanova ◽  
Y. Hao ◽  
K. Hadjiivanov ◽  
H. Knözinger ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Catalysis

SiO2–Ag–SiO2core/shell structure with a high density of Ag nanoparticles for CO oxidation catalysis

2016 ◽  
Vol 27 (45) ◽  
pp. 455605 ◽  
Author(s):  
Xiaoqian Feng ◽  
Hongmo Li ◽  
Qing Zhang ◽  
Peng Zhang ◽  
Xuefeng Song ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Shell Structure ◽  
Ag Nanoparticles ◽  
High Density ◽  
Oxidation Catalysis

The interplay between structural perfectness and CO oxidation catalysis on aluminum, phosphorous and silicon complexes of corroles

2019 ◽  
Vol 21 (14) ◽  
pp. 7661-7674 ◽  
Author(s):  
Afshan Mohajeri ◽  
Nasim Hassani
Keyword(s):  
Density Functional Theory ◽  
Carbon Monoxide ◽  
Co Oxidation ◽  
Catalytic Oxidation ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Oxidation Catalysis ◽  
Functional Theory ◽  
Oxidation Of Carbon Monoxide

Catalytic oxidation of carbon monoxide on perfect and defective structures of corrole complexes with aluminum, phosphorous and silicon have been investigated by performing density functional theory calculations.

Oxidation Catalysis by Supported Gold Nanoclusters.

ChemInform ◽  
2003 ◽  
Vol 34 (20) ◽  
Author(s):  
T. V. Choudhary ◽  
D. W. Goodman
Keyword(s):  
Gold Nanoclusters ◽  
Oxidation Catalysis ◽  
Supported Gold

Bimetallic Nanoparticles of PtCu and PtNi; Synthesis and CO Oxidation Catalysis

2009 ◽  
Vol 1217 ◽  
Author(s):  
Takao A. Yamamoto ◽  
Takashi Nakagawa ◽  
Satoshi Seino ◽  
Hiroaki Nitani
Keyword(s):  
Electron Beam ◽  
Co Oxidation ◽  
Bimetallic Nanoparticles ◽  
Hydrogen Gas ◽  
Oxidation Catalysis ◽  
Water Radiolysis ◽  
Metallic State ◽  
Iron Oxide Particles ◽  
Preferential Oxidation Of Co ◽  
Aqueous Ions

AbstractBimetallic nanoparticles of PtCu and PtNi supported on iron oxide particles were synthesized by a new method employing a 4.8-MeV electron beam as a trigger for reduction of their aqueous ions, and their CO oxidation catalysis was evaluated to find activities enhanced by the alloying. Sample materials of PtCu (PtNi) bimetallic grains supported on γ-Fe2O3 particles were synthesized by irradiating with the electron beam a glass vial containing precursors in an aqueous solution. The vial contains aqueous ions of platinum and copper (nickel) and γ-Fe2O3 particles of average size of 30 nm. The irradiation induces water radiolysis generating reducing species, such as hydrated electrons, and metallic nanograins are formed and stabilized on the support material. The irradiation was finished in several seconds without using any organic solvent and any surfactant. The average grain sizes observed with a TEM were around 3 nm in diameter. XRD patterns of PtCu samples exhibited the FCC structure with peak shifts obeying the Vegard’s law at low Cu concentrations. X-ray absorption spectra measured at edges of the constituent elements indicated that Pt is in the metallic state and coordinates certainly with Cu or Ni. Catalytic activity of CO oxidation of the material was evaluated by measuring residual CO contents in air in contact with the sample material by using a gas-chromatograph. The activities of the PtCu and PtNi samples were higher than that of monolithic Pt on γ-Fe2O3. The correlation between the atomic structure in these nanograins and their activities was investigated, which indicated that the random alloy enhances the activity. These bimetallic nanoparticles are expected as catalysts for preferential oxidation of CO in hydrogen gas fed to fuel cells.

CO-TPR-DRIFTS-MS in situ study of CuO/Ce1−xTbxO2−y (x=0, 0.2 and 0.5) catalysts: Support effects on redox properties and CO oxidation catalysis

2009 ◽  
Vol 268 (2) ◽  
pp. 367-375 ◽  
Author(s):  
Aitor Hornés ◽  
Parthasarathi Bera ◽  
Antonio López Cámara ◽  
Daniel Gamarra ◽  
Guillermo Munuera ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Redox Properties ◽  
Oxidation Catalysis ◽  
Support Effects ◽  
In Situ Study

Role of RuO2(100) in surface oxidation and CO oxidation catalysis on Ru(0001)

2016 ◽  
Vol 18 (1) ◽  
pp. 213-219 ◽  
Author(s):  
Jan Ingo Flege ◽  
Jan Lachnitt ◽  
Daniel Mazur ◽  
Peter Sutter ◽  
Jens Falta
Keyword(s):  
Co Oxidation ◽  
Surface Oxidation ◽  
Oxidation Catalysis ◽  
Simultaneous Formation ◽  
Structure Sensitive ◽  
Oxygen Spillover

Oxidation of Ru(0001) induces the simultaneous formation of RuO2(100) and RuO2(110) and a structure-sensitive oxygen spillover during CO oxidation.

Sign in / Sign up

Export Citation Format

Share Document