Hollow tungsten carbide/carbon sphere promoted Pt electrocatalyst for efficient methanol oxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 6790-6796 ◽  
Author(s):  
Zaoxue Yan ◽  
Fan Li ◽  
Jimin Xie ◽  
Xuli Miu
Keyword(s):  
Particle Size ◽  
Synergistic Effect ◽  
Tungsten Carbide ◽  
Methanol Oxidation ◽  
Noble Metal ◽  
Carbon Sphere ◽  
Surface Carbon

The surface carbon thickness and particle size of tungsten carbide (WC) are critical to its synergistic effect on noble metal based electrocatalysts.

Tungsten carbide/porous carbon core–shell nanocomposites as a catalyst support for methanol oxidation

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 13873-13880 ◽  
Author(s):  
Xiaoling Lang ◽  
Meiqin Shi ◽  
Yekun Jiang ◽  
Huan Chen ◽  
Chunan Ma
Keyword(s):  
Synergistic Effect ◽  
Tungsten Carbide ◽  
Methanol Oxidation ◽  
Porous Carbon ◽  
Catalyst Support ◽  
Electrochemical Activity ◽  
Core Shell ◽  
Carbon Core

The Pt–WC@C demonstrates higher electrochemical activity, which could be attributed to the better dispersed Pt on WC which leads to the improved synergistic effect between WC and Pt.

scholarly journals The Deoxygenation of Jatropha Oil to High Quality Fuel via the Synergistic Catalytic Effect of Ni, W2C and WC Species

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 469
Author(s):  
Keyao Zhou ◽  
Xiangze Du ◽  
Linyuan Zhou ◽  
Huiru Yang ◽  
Xiaomei Lei ◽  
...  
Keyword(s):  
Particle Size ◽  
Synergistic Effect ◽  
Tungsten Carbide ◽  
Active Sites ◽  
Catalytic Effect ◽  
Catalytic Performance ◽  
Reduction Temperature ◽  
Jatropha Oil ◽  
High Quality ◽  
Nickel Tungsten

Tungsten carbide-based materials have good deoxygenation activity in the conversion of biomass. In this paper, catalysts with different nickel–tungsten carbide species were prepared by tuning the reduction temperature and Ni loading, and the effects of these different tungsten carbide species in the conversion of jatropha oil were studied. XRD, XPS, TEM, HRTEM, Raman, H2-TPR, ICP-AES were used to characterize the catalysts. The results suggested that metallic W was gradually carburized to W2C species, and W2C species was further carburized to WC species with the increase in reduction temperature and Ni loading. The obtained 10Ni10W/AC-700 catalyst exhibited outstanding catalytic performance with 99.7% deoxygenation rate and 94.5% C15-18 selectivity, which were attributed to the smallest particle size, the best dispersion, the most exposed active sites, and the synergistic effect of Ni, W2C and WC species.

Exterior and small carbide particle promoted platinum electrocatalyst for efficient methanol oxidation

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 66665-66671 ◽  
Author(s):  
Zaoxue Yan ◽  
Lina Gao ◽  
Xinhong Zhao ◽  
Wei Wei ◽  
Jimin Xie ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Methanol Oxidation ◽  
Noble Metal ◽  
Carbide Particle ◽  
Platinum Electrocatalyst

Carbides have a synergistic effect on noble metal based electrocatalysts.

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

Effect of surface carbon on the hydrogen evolution reactivity of tungsten carbide (WC) and Pt-modified WC electrocatalysts

2012 ◽  
Vol 37 (4) ◽  
pp. 3019-3024 ◽  
Author(s):  
Yannick C. Kimmel ◽  
Daniel V. Esposito ◽  
Robert W. Birkmire ◽  
Jingguang G. Chen
Keyword(s):  
Tungsten Carbide ◽  
Hydrogen Evolution ◽  
Surface Carbon ◽  
Effect Of Surface

scholarly journals Effect of initial particle size and various composition on the spark plasma sintering of binderless tungsten carbide

2021 ◽  
Vol 1758 (1) ◽  
pp. 012022
Author(s):  
E A Lantsev ◽  
N V Malekhonova ◽  
V N Chuvil`deev ◽  
A V Nokhrin ◽  
M S Boldin ◽  
...  
Keyword(s):  
Particle Size ◽  
Tungsten Carbide ◽  
Spark Plasma Sintering ◽  
Initial Particle ◽  
Initial Particle Size ◽  
Plasma Sintering ◽  
Spark Plasma

Preparation of mesoporous silica-based nanocomposites with synergistically antibacterial performance from nano-metal (oxide) and polydopamine

2021 ◽  
Author(s):  
Guofeng Su ◽  
Ximing Zhong ◽  
Songfa Qiu ◽  
Jiajin Fan ◽  
hongjun zhou ◽  
...  
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Mesoporous Silica ◽  
Synergistic Effect ◽  
Practical Applications ◽  
Antibacterial Performance ◽  
Large Size ◽  
Zinc Oxides ◽  
Nanocomposite System ◽  
Nano Zinc

Abstract In this work, a novel antibacterial nanocomposite system was developed using mesoporous silica (MSN) as an effective nanocarrier, and the resultant nanocomposites demonstrated remarkable antibacterial performance due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine (PDA). The successful synthesis of MSN/ZnO@PDA/Ag nanocomposites was confirmed. The physicochemical properties and the morphologies of these nanocomposites were investigated. It was found that the particle size increased along with the evolution of these nanocomposites. Besides, nano zinc oxides were formed in the nanoconfinement channel of mesoporous silica with a particle size about 2 nm, and that of silver nanoparticle was less than 50 nm. In addition, the results revealed that the presence of mesoporous silica could effectively prevent the formation of large-size silver nanoparticles and facilitate their well dispersion. Due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine, these nanocomposites exhibited remarkable antibacterial performance even at a low concentration of 313 ppm, and the antibacterial mechanism was also elucidated. Therefore, this work provides a facile and controllable approach to preparing synergistically antibacterial nanocomposites, and the remarkable antibacterial performance make them suitable for practical applications.

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