Redox chemistry of gold in a Au/FeO /CeO2 CO oxidation catalyst

2009 ◽  
Vol 10 (8) ◽  
pp. 1196-1202 ◽  
Author(s):  
A. Penkova ◽  
K. Chakarova ◽  
O.H. Laguna ◽  
K. Hadjiivanov ◽  
F. Romero Saria ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Redox Chemistry ◽  
Oxidation Catalyst

scholarly journals An oxidized magnetic Au single atom on doped TiO2(110) becomes a high performance CO oxidation catalyst due to the charge effect

2017 ◽  
Vol 5 (36) ◽  
pp. 19316-19322 ◽  
Author(s):  
J. L. Shi ◽  
X. J. Zhao ◽  
L. Y. Zhang ◽  
X. L. Xue ◽  
Z. X. Guo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Co Oxidation ◽  
High Performance ◽  
Important Application ◽  
Oxidation Catalyst ◽  
Single Atom ◽  
Charge Effect ◽  
Extensive Investigation ◽  
Doped Tio2

Catalysis using gold nanoparticles supported on oxides has been under extensive investigation for many important application processes.

scholarly journals Complex Three-Dimensional Co3O4 Nano-Raspberry: Highly Stable and Active Low-temperature CO Oxidation Catalyst

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 662 ◽  
Author(s):  
Teruaki Fuchigami ◽  
Ryosuke Kimata ◽  
Masaaki Haneda ◽  
Ken-ichi Kakimoto
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
High Performance ◽  
Noble Metals ◽  
Three Dimensional ◽  
Oxidation Catalyst ◽  
High Catalytic Activity ◽  
Co3o4 Nanoparticles ◽  
Bridging Ligands ◽  
Low Temperature Co Oxidation

Highly stable and active low-temperature CO oxidation catalysts without noble metals are desirable to achieve a sustainable society. While zero-dimensional to three-dimensional Co3O4 nanoparticles show high catalytic activity, simple-structured nanocrystals easily self-aggregate and become sintered during catalytic reaction. Thus, complex three-dimensional nanostructures with high stability are of considerable interest. However, the controlled synthesis of complex nanoscale shapes remains a great challenge as no synthesis theory has been established. In this study, 100 nm raspberry-shaped nanoparticles composed of 7–8 nm Co3O4 nanoparticles were synthesized by hydrothermally treating cobalt glycolate solution with sodium sulfate. Surface single nanometer-scale structures with large surface areas of 89 m2·g−1 and abundant oxygen vacancies were produced. The sulfate ions functioned as bridging ligands to promote self-assembly and suppress particle growth. The Co3O4 nano-raspberry was highly stable under catalytic tests at 350 °C and achieved nearly 100% CO conversion at room temperature. The addition of bridging ligands is an effective method to control the formation of complex but ordered three-dimensional nanostructures that possessed extreme thermal and chemical stability and exhibited high performance.

First-principles Study of PdAu Segregation with CO Coverage

2009 ◽  
Vol 1177 ◽  
Author(s):  
Bin Shan ◽  
Jangsuk Hyun ◽  
Neeti Kapur ◽  
Kyeongjae Cho
Keyword(s):  
Diesel Engine ◽  
Co Oxidation ◽  
First Principles ◽  
Surface Composition ◽  
Co Adsorption ◽  
Quantitative Relationship ◽  
Pure Metal ◽  
Oxidation Catalyst ◽  
Embedded Atom ◽  
Key Factor

AbstractAlloying has been one of the strategies to develop alternatives to Pt based CO oxidation catalyst. PdAu bimetallic alloy has recently been shown to have better reactivity and thermal stability toward CO oxidation for diesel engine applications as compared to pure metal catalysts. The key factor for low temperature light off in diesel engine catalysis is reactivity of alloy catalysts under CO environment, which in turn depends on the alloy surface composition and morphology. We explored the segregation processes in bimetallic Pd-Au alloy using first-principles calculations, assisted by a Monte-Carlo (MC) scheme that combines an improved Embedded Atom Method (EAM) and an atomistic treatment for adsorbed CO molecules for searching low energy states. Our simulation results show that PdAu surface changes from Au-rich to Pd-rich with increase in CO coverage up to 0.75 ML, beyond which additional CO adsorption is no longer favorable. A quantitative relationship between CO coverage and Pd concentrations on the surface is also revealed.

scholarly journals Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal–Support Interaction between Platinum Nanoparticles and Nanosized Ceria

ACS Catalysis ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 6151-6155 ◽  
Author(s):  
Suresh Gatla ◽  
Daniel Aubert ◽  
Giovanni Agostini ◽  
Olivier Mathon ◽  
Sakura Pascarelli ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Platinum Nanoparticles ◽  
Room Temperature ◽  
Oxidation Catalyst ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support
Sign in / Sign up

Export Citation Format

Share Document