scholarly journals Improved Catalytic Performance of Au/α-Fe2O3-Like-Worm Catalyst for Low Temperature CO Oxidation

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1118 ◽  
Author(s):  
Qiuwan Han ◽  
Dongyang Zhang ◽  
Jiuli Guo ◽  
Baolin Zhu ◽  
Weiping Huang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Active Sites ◽  
Catalytic Performance ◽  
Photoelectron Spectra ◽  
Great Activity ◽  
X Ray ◽  
Co Oxidation Reaction

The gold catalysts supported on various morphologies of α-Fe2O3 in carbon monoxide (CO) oxidation reaction have been studied for many researchers. However, how to improve the catalytic activity and thermal stability for CO oxidation is still important. In this work, an unusual morphology of α-Fe2O3 was prepared by hydrothermal method and gold nanoparticles were supported using a deposition-precipitation method. Au/α-Fe2O3 catalyst exhibited great activity for CO oxidation. The crystal structure and microstructure images of α-Fe2O3 were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and the size of gold nanoparticles was determined by transmission electron microscopy (TEM). X-ray photoelectron spectra (XPS) and Fourier transform infrared spectra (FTIR) results confirmed that the state of gold was metallic. The 1.86% Au/α-Fe2O3 catalyst calcined at 300 °C had the best catalytic performance for CO oxidation reaction and the mechanism for CO oxidation reaction was also discussed. It is highly likely that the small size of gold nanoparticle, oxygen vacancies and active sites played the decisive roles in CO oxidation reaction.

scholarly journals Multimodal Operando Electron Microscopy Approach to Study Pt Catalyst During CO Oxidation Reaction

2019 ◽  
Vol 25 (S2) ◽  
pp. 1448-1449 ◽  
Author(s):  
M. Plodinec ◽  
E. Stotz ◽  
L. Sandoval-Diaz ◽  
R. Schlögl ◽  
T. Lunkenbein
Keyword(s):  
Electron Microscopy ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Pt Catalyst ◽  
Co Oxidation Reaction

scholarly journals Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 371 ◽  
Author(s):  
Maria Lykaki ◽  
Sofia Stefa ◽  
Sόnia Carabineiro ◽  
Pavlos Pandis ◽  
Vassilis Stathopoulos ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Co Oxidation ◽  
Photoelectron Spectroscopy ◽  
Rational Design ◽  
Mixed Oxides ◽  
Specific Activity ◽  
Catalytic Performance ◽  
Catalytic Systems ◽  
X Ray ◽  
Full Characterization

Ceria has been widely studied either as catalyst itself or support of various active phases in many catalytic reactions, due to its unique redox and surface properties in conjunction to its lower cost, compared to noble metal-based catalytic systems. The rational design of catalytic materials, through appropriate tailoring of the particles’ shape and size, in order to acquire highly efficient nanocatalysts, is of major significance. Iron is considered to be one of the cheapest transition metals while its interaction with ceria support and their shape-dependent catalytic activity has not been fully investigated. In this work, we report on ceria nanostructures morphological effects (cubes, polyhedra, rods) on the textural, structural, surface, redox properties and, consequently, on the CO oxidation performance of the iron-ceria mixed oxides (Fe2O3/CeO2). A full characterization study involving N2 adsorption at –196 °C, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) was performed. The results clearly revealed the key role of support morphology on the physicochemical properties and the catalytic behavior of the iron-ceria binary system, with the rod-shaped sample exhibiting the highest catalytic performance, both in terms of conversion and specific activity, due to its improved reducibility and oxygen mobility, along with its abundance in Fe2+ species.

Pt-embedded-CeO2hollow spheres for enhancing CO oxidation performance

2017 ◽  
Vol 1 (9) ◽  
pp. 1754-1763 ◽  
Author(s):  
Ke Wu ◽  
Liang Zhou ◽  
Chun-Jiang Jia ◽  
Ling-Dong Sun ◽  
Chun-Hua Yan
Keyword(s):  
Co Oxidation ◽  
Oxidation Reaction ◽  
Hollow Spheres ◽  
Catalytic Performance ◽  
Co Oxidation Reaction ◽  
Oxidation Performance

Pt-embedded-CeO2hollow spheres are successfully synthesized and show enhanced catalytic performance toward CO oxidation reaction.

Catalytic performance and characterization of Au/doped-ceria catalysts for the preferential CO oxidation reaction

2008 ◽  
Vol 256 (2) ◽  
pp. 237-247 ◽  
Author(s):  
G AVGOUROPOULOS ◽  
M MANZOLI ◽  
F BOCCUZZI ◽  
T TABAKOVA ◽  
J PAPAVASILIOU ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Reaction ◽  
Catalytic Performance ◽  
Doped Ceria ◽  
Preferential Co Oxidation ◽  
Co Oxidation Reaction ◽  
Ceria Catalysts

scholarly journals Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 742 ◽  
Author(s):  
Jingsen Zhang ◽  
Lanbo Di ◽  
Feng Yu ◽  
Dongzhi Duan ◽  
Xiuling Zhang
Keyword(s):  
Gold Nanoparticles ◽  
Co Oxidation ◽  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Diffuse Reflectance Spectroscopy ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
High Concentration ◽  
Oxidation Activity ◽  
X Ray

Commercial TiO2 (P25) supported gold (Au/P25) attracts increasing attention. In this work, atmospheric-pressure (AP) cold plasma was employed to activate the Au/P25-As catalyst prepared by a modified impregnation method. The influence of cold plasma working gas (oxygen, argon, hydrogen, and air) on the structure and performance of the obtained Au/P25 catalysts was investigated. X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and X-ray spectroscopy (XPS) were adopted to characterize the Au/P25 catalysts. CO oxidation was used as model reaction probe to test the Au/P25 catalyst. XRD results reveal that supporting gold and AP cold plasma activation have little effect on the P25 support. CO oxidation activity over the Au/P25 catalysts follows the order: Au/P25-O2P > Au/P25-As > Au/P25-ArP ≈ Au/P25-H2P > Au/P25-AirP. Au/P25-AirP presents the poorest CO oxidation catalytic activity among the Au/P25 catalysts, which may be ascribed to the larger size of gold nanoparticles, low concentration of active [O]s, as well as the poisoning [NOx]s. The poor catalytic performance of Au/P25-ArP and Au/P25-H2P is ascribed to the lower concentration of [O]s species. 100% CO conversion temperatures for Au/P25-O2P is 40 °C, which is 30 °C lower than that over the as-prepared Au/P25-As catalyst. The excellent CO oxidation activity over Au/P25-O2P is mainly attributed to the efficient decomposition of gold precursor species, small size of gold nanoparticles, and the high concentration of [O]s species.

Pd@Rh core–shell nanocrystals with well-defined facets and their enhanced catalytic performance towards CO oxidation

2019 ◽  
Vol 4 (5) ◽  
pp. 1232-1238 ◽  
Author(s):  
Sang-Il Choi ◽  
Allison Young ◽  
Sujin R. Lee ◽  
Cheng Ma ◽  
Ming Luo ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Reaction Kinetics ◽  
Oxidation Reaction ◽  
Catalytic Performance ◽  
Core Shell ◽  
Co Oxidation Reaction

The Pd@Rh core-shell nanocrystals exhibit enhanced CO oxidation reaction kinetics relative to the monometallic counterparts.

scholarly journals Hydrothermal Synthesis of ZnO–doped Ceria Nanorods: Effect of ZnO Content on the Redox Properties and the CO Oxidation Performance

2020 ◽  
Vol 10 (21) ◽  
pp. 7605
Author(s):  
Sofia Stefa ◽  
Maria Lykaki ◽  
Vasillios Binas ◽  
Pavlos K. Pandis ◽  
Vassilis N. Stathopoulos ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Co Oxidation ◽  
Rational Design ◽  
Mixed Oxides ◽  
Relevant Literature ◽  
Fine Tuning ◽  
Oxygen Storage ◽  
Doped Ceria ◽  
X Ray ◽  
Co Oxidation Reaction

The rational design of highly efficient, noble metal-free metal oxides is one of the main research priorities in the area of catalysis. To this end, the fine tuning of ceria-based mixed oxides by means of aliovalent metal doping has currently received particular attention due to the peculiar metal-ceria synergistic interactions. Herein, we report on the synthesis, characterization and catalytic evaluation of ZnO–doped ceria nanorods (NR). In particular, a series of bare CeO2 and ZnO oxides along with CeO2/ZnO mixed oxides of different Zn/Ce atomic ratios (0.2, 0.4, 0.6) were prepared by the hydrothermal method. All prepared samples were characterized by X-ray diffraction (XRD), N2 physisorption, temperature-programmed reduction (TPR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). The CO oxidation reaction was employed as a probe reaction to gain insight into structure-property relationships. The results clearly showed the superiority of mixed oxides as compared to bare ones, which could be ascribed to a synergistic ZnO–CeO2 interaction towards an improved reducibility and oxygen mobility. A close correlation between the catalytic activity and oxygen storage capacity (OSC) was disclosed. Comparison with relevant literature studies verifies the role of OSC as a key activity descriptor for reactions following a redox-type mechanism.

Synthesis of MCF-supported AuCo nanoparticle catalysts and the catalytic performance for the CO oxidation reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 100212-100222 ◽  
Author(s):  
Lin Li ◽  
Song-Hai Chai ◽  
Andrew Binder ◽  
Suree Brown ◽  
Shi-Ze Yang ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Reaction ◽  
Catalytic Performance ◽  
Nanoparticle Catalysts ◽  
Co Oxidation Reaction ◽  
Stable Catalyst

AuCo/MCF calcined at 500 °C for 1 h was found to produce the most active and stable catalyst for CO oxidation. In situ FTIR results of AuCo/MCF catalysts with different treatments.

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