Role of the FeOxsupport in constructing high-performance Pt/FeOxcatalysts for low-temperature CO oxidation

2016 ◽  
Vol 6 (5) ◽  
pp. 1546-1554 ◽  
Author(s):  
Bin Zheng ◽  
Gang Liu ◽  
Longlong Geng ◽  
Junyan Cui ◽  
Shujie Wu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Oxidation State ◽  
Active Sites ◽  
High Performance ◽  
Pt Nanoparticles ◽  
Catalytic Process ◽  
Low Temperature Co Oxidation

The FeOxsupport not only affects the oxidation state of Pt nanoparticles, but also provides active sites in the catalytic process.

scholarly journals The Origin of Au/Ce1-xZrxO2 Catalyst’s Active Sites in Low-Temperature CO Oxidation

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1312
Author(s):  
Izabela Dobrosz-Gómez ◽  
Miguel-Ángel Gómez-García ◽  
Jacek Michał Rynkowski
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Active Sites ◽  
Surface Composition ◽  
Co Adsorption ◽  
Gold Catalysis ◽  
Support Surface ◽  
Oxide Support ◽  
Low Temperature Co Oxidation

Gold catalysts have found applications in many reactions of both industrial and environmental importance. Great interest has been paid to the development of new processes that reduce energy consumption and minimize pollution. Among these reactions, the catalytic oxidation of carbon monoxide (CO) is an important one, considering that a high concentration of CO in the atmosphere creates serious health and environmental problems. This paper examines the most important achievements and conclusions arising from the own authorship contributions concerning (2 wt. % Au)/Ce1−xZrxO2 catalyst’s active sites in low-temperature CO oxidation. The main findings of the present review are: (1) The effect of preparing conditions on Au crystallite size, highlighting some of the fundamental underpinnings of gold catalysis: the Au surface composition and the poisoning effect of residual chloride on the catalytic activity of (2 wt. % Au)/Ce1−xZrxO2 catalysts in CO oxidation; (2) The identification of ion clusters related to gold and their effect on catalyst’ surface composition; (3) The importance of physicochemical properties of oxide support (e.g., its particle size, oxygen mobility at low temperature and redox properties) in the creation of catalytic performance of Au catalysts; (4) The importance of oxygen vacancies, on the support surface, as the centers for oxygen molecule activation in CO reaction; (5) The role of moisture (200–1000 ppm) in the generation of enhanced CO conversion; (6) The Au-assisted Mars-van Krevelen (MvK) adsorption–reaction model was pertinent to describe CO oxidation mechanism. The principal role of Au in CO oxidation over (2 wt. % Au)/Ce1−xZrxO2 catalysts was related to the promotion in the transformation process of reversibly adsorbed or inactive surface oxygen into irreversibly adsorbed active species; (7) Combination of metallic gold (Au0) and Au-OH species was proposed as active sites for CO adsorption. These findings can help in the optimization of Au-containing catalysts.

Low-temperature CO oxidation over supported Pt, Pd catalysts: Particular role of FeOx support for oxygen supply during reactions

2010 ◽  
Vol 274 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Lequan Liu ◽  
Feng Zhou ◽  
Liguo Wang ◽  
Xiujuan Qi ◽  
Feng Shi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Oxygen Supply ◽  
Pd Catalysts ◽  
Low Temperature Co Oxidation

The role of iron oxide in the highly effective Fe-modified Co3O4 catalyst for low-temperature CO oxidation

RSC Advances ◽  
2013 ◽  
Vol 3 (30) ◽  
pp. 12409 ◽  
Author(s):  
Jie Li ◽  
Guanzhong Lu ◽  
Guisheng Wu ◽  
Dongsen Mao ◽  
Yanglong Guo ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Low Temperature ◽  
Co Oxidation ◽  
Highly Effective ◽  
Low Temperature Co Oxidation

Low-temperature CO oxidation on Ag/ZSM-5 catalysts: Influence of Si/Al ratio and redox pretreatments on formation of silver active sites

Fuel ◽  
2017 ◽  
Vol 188 ◽  
pp. 121-131 ◽  
Author(s):  
E. Kolobova ◽  
A. Pestryakov ◽  
G. Mamontov ◽  
Yu. Kotolevich ◽  
N. Bogdanchikova ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Active Sites ◽  
Low Temperature Co Oxidation

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.

scholarly journals Elucidation of the Active Sites in Single-Atom Pd1/CeO2 Catalysts for Low-Temperature CO Oxidation

ACS Catalysis ◽  
2020 ◽  
Vol 10 (19) ◽  
pp. 11356-11364 ◽  
Author(s):  
Dong Jiang ◽  
Gang Wan ◽  
Carlos E. García-Vargas ◽  
Linze Li ◽  
Xavier Isidro Pereira-Hernández ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Active Sites ◽  
Single Atom ◽  
Low Temperature Co Oxidation

Activation of surface lattice oxygen in single-atom Pt/CeO2 for low-temperature CO oxidation

Science ◽  
2017 ◽  
Vol 358 (6369) ◽  
pp. 1419-1423 ◽  
Author(s):  
Lei Nie ◽  
Donghai Mei ◽  
Haifeng Xiong ◽  
Bo Peng ◽  
Zhibo Ren ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Active Sites ◽  
Fuel Efficiency ◽  
Steam Treatment ◽  
Single Atom ◽  
Oxidation Activity ◽  
Formidable Challenge ◽  
Low Temperature Co Oxidation ◽  
Exhaust Treatment

To improve fuel efficiency, advanced combustion engines are being designed to minimize the amount of heat wasted in the exhaust. Hence, future generations of catalysts must perform at temperatures that are 100°C lower than current exhaust-treatment catalysts. Achieving low-temperature activity, while surviving the harsh conditions encountered at high engine loads, remains a formidable challenge. In this study, we demonstrate how atomically dispersed ionic platinum (Pt2+) on ceria (CeO2), which is already thermally stable, can be activated via steam treatment (at 750°C) to simultaneously achieve the goals of low-temperature carbon monoxide (CO) oxidation activity while providing outstanding hydrothermal stability. A new type of active site is created on CeO2 in the vicinity of Pt2+, which provides the improved reactivity. These active sites are stable up to 800°C in oxidizing environments.

Facile synthesis of PbTiO3 truncated octahedra via solid-state reaction and their application in low-temperature CO oxidation by loading Pt nanoparticles

2014 ◽  
Vol 2 (24) ◽  
pp. 9035-9039 ◽  
Author(s):  
Simin Yin ◽  
Yihan Zhu ◽  
Zhaohui Ren ◽  
Chunying Chao ◽  
Xiang Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Solid State ◽  
Low Temperature ◽  
Co Oxidation ◽  
Solid State Reaction ◽  
Pt Nanoparticles ◽  
Facile Synthesis ◽  
Low Temperature Co Oxidation

Pt NPs have been investigated to selectively nucleate on the {111} facets of PbTiO3 truncated octahedra, exhibiting a remarkable low-temperature catalytic activity towards CO oxidation with a 100% conversion at ∼50 °C.

Promotional role of ceria on cobaltosic oxide catalyst for low-temperature CO oxidation

2012 ◽  
Vol 2 (9) ◽  
pp. 1865 ◽  
Author(s):  
Jie Li ◽  
Guanzhong Lu ◽  
Guisheng Wu ◽  
Dongsen Mao ◽  
Yanqin Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Oxide Catalyst ◽  
Low Temperature Co Oxidation ◽  
Cobaltosic Oxide
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