Improvement of the catalytic stability of molybdenum carbide via encapsulation within carbon nanotubes in dry methane reforming

2018 ◽  
Vol 8 (3) ◽  
pp. 697-701 ◽  
Author(s):  
Haifeng Gao ◽  
Zhiwei Yao ◽  
Yan Shi ◽  
Siqi Wang
Keyword(s):  
Carbon Nanotubes ◽  
Oxidation Resistance ◽  
Molybdenum Carbide ◽  
Methane Reforming ◽  
Catalytic Stability ◽  
First Time

We reported for the first time the enhancement of the oxidation resistance of Mo2C nanoparticles by encapsulation within carbon nanotubes (CNTs).

Molybdenum carbide nanoparticles within carbon nanotubes as superior catalysts for γ-valerolactone production via levulinic acid hydrogenation

2014 ◽  
Vol 16 (9) ◽  
pp. 4092-4097 ◽  
Author(s):  
Estevão F. Mai ◽  
Marta A. Machado ◽  
Thomas E. Davies ◽  
Jose A. Lopez-Sanchez ◽  
Victor Teixeira da Silva
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Phase ◽  
Levulinic Acid ◽  
Molybdenum Carbide ◽  
Efficient Catalyst ◽  
Supported Molybdenum Carbide ◽  
First Time

We report here for the first time that supported molybdenum carbide is an efficient catalyst to selectively convert levulinic acid into γ-valerolactone in the aqueous phase.

Incorporation of Multi Wall Carbon Nanotubes into Glass-Surfaces via Laser-Treatment

2003 ◽  
Vol 772 ◽  
Author(s):  
T. Seeger ◽  
G. de la Fuente ◽  
W.K. Maser ◽  
A.M. Benito ◽  
A. Righi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Continuous Wave ◽  
Silica Surface ◽  
Multi Wall Carbon Nanotubes ◽  
Composite Formation ◽  
Multi Walled Carbon Nanotubes ◽  
Glass Surfaces ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
Scanning Electron

AbstractCarbon nanotubes (CNT) are interesting candidates for the reinforcement in robust composites and for conducting fillers in polymers due to their fascinating electronic and mechanical properties. For the first time, we report the incorporation of multi walled carbon nanotubes (MWNTs) into silica-glass surfaces by means of partial surface-melting caused by a continuous wave Nd:YAG laser. MWNTs were detected being well incorporated in the silica-surface. The composites are characterized using scanning electron microscopy (SEM) and Raman-spectroscopy. A model for the composite-formation is proposed based on heatabsorption by MWNTs and a partial melting of the silica-surface.

scholarly journals Supramolecular structures of terbium(iii) porphyrin double-decker complexes on a single-walled carbon nanotube surface

RSC Advances ◽  
2019 ◽  
Vol 9 (48) ◽  
pp. 28135-28145
Author(s):  
Ahmed I. A. Abd El-Mageed ◽  
Takuji Ogawa
Keyword(s):  
Carbon Nanotubes ◽  
Scanning Probe Microscopy ◽  
Single Walled Carbon Nanotubes ◽  
Supramolecular Structures ◽  
Scanning Probe ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Double Decker ◽  
Walled Carbon Nanotubes ◽  
First Time

For the first time, using scanning probe microscopy, the supramolecular structures of terbium porphyrin double-decker complexes were observed on single-walled carbon nanotubes surfaces, where the molecules formed a well-ordered self-assembled array.

Micromachined Methanol Steam Reforming System Integrated With Catalytic Combustor Using Carbon Nanotubes as Catalyst Supports

2006 ◽  
Author(s):  
Dae-Eun Park ◽  
Tae-Kyu Kim ◽  
Sejin Kwon ◽  
Choong-Ki Kim ◽  
Euisik Yoon
Keyword(s):  
Carbon Nanotubes ◽  
Processing System ◽  
Pt Catalyst ◽  
Catalyst Supports ◽  
Fuel Processing ◽  
Reforming Catalyst ◽  
Coating Method ◽  
Catalytic Hydrogen ◽  
Catalytic Combustor ◽  
First Time

In this paper we have successfully demonstrated a new micromachined fuel processing system including vaporizer, catalytic combustor and methanol steam reformer. This fuel processing system utilizes the thermal energy generated from the catalytic hydrogen combustion to heat up the entire system. For the first time, we have used carbon nanotubes as a supporting structure of Pt catalyst for combustion. The catalytic combustor could supply the energy to heat the reformer and maintain its working temperature. We have also developed a new coating method of reforming catalyst (Cu/ZnO/Al2O3) and observed that adequate amount of hydrogen can be generated for PEMFC. We have successfully reported the feasibility of the proposed fuel processing system in each assembled component.

scholarly journals Effects of CNT Addition on Mechanical Properties, Electric Conductivity and Oxidation Resistance of Al2O3-TiC Composite

2013 ◽  
Vol 761 ◽  
pp. 83-86
Author(s):  
Hideaki Sano ◽  
Junichi Morisaki ◽  
Guo Bin Zheng ◽  
Yasuo Uchiyama
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Electric Conductivity ◽  
Young’S Modulus ◽  
Oxidation Resistance ◽  
Young's Modulus ◽  
Tic Particle

Effects of carbon nanotubes (CNT) addition on mechanical properties, electric conductivity and oxidation resistance of CNT/Al2O3-TiC composite were investigated. It was found that flexural strength, Young’s modulus and fracture toughness of the composites were improved by addition of more than 2 vol%-CNT. In the composites with more than 3 vol%-CNT, the oxidation resistance of the composite was degraded. In comparison with Al2O3-26vol%TiC sample as TiC particle-percolated sample, the Al2O3-12vol%TiC-3vol%CNT sample, which is not TiC particle-percolated sample, shows almost the same mechanical properties and electric conductivity, and also shows thinner oxidized region after oxidation at 1200°C due to less TiC in the composite.

The effects of sulfur and oxygen on the catalytic activity of molybdenum carbide during dry methane reforming

2004 ◽  
Vol 275 (1-2) ◽  
pp. 213-220 ◽  
Author(s):  
Meredith L. Pritchard ◽  
Robert L. McCauley ◽  
Ben N. Gallaher ◽  
William J. Thomson
Keyword(s):  
Catalytic Activity ◽  
Molybdenum Carbide ◽  
Methane Reforming

Preparation and ESR Properties of Silicon Nitride Nanowires

2012 ◽  
Vol 164 ◽  
pp. 69-72
Author(s):  
Jin Chen ◽  
Xiao Gang Wang ◽  
Hai Yan Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Phase Composition ◽  
Silicon Nitride ◽  
Oxidation Resistance ◽  
Raw Materials ◽  
Blue Shift ◽  
Ftir Spectra ◽  
Structure Phase ◽  
Ammonia Atmosphere ◽  
Main Component

We prepared Solid silicon nitride nanowires using carbon nanotubes as precursors., Si and SiO2 were used as raw materials,the reaction was carried out in ammonia atmosphere The structure, phase composition, ESR properties and oxidation resistance of the sample were investigated. The results showed that the sizes of the nanorods are 60–80 nm in diameter and up to several microns in length. In the products α-Si3N4 is the main component; the FTIR spectra of the silicon nitride nanowires have blue shift phenomena;The ESR properties show that the as made materials contains a large number of unpaired electrons

scholarly journals Carbon-Supported Mo2C for Oxygen Reduction Reaction Electrocatalysis

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1805
Author(s):  
Dušan Mladenović ◽  
Milica Vujković ◽  
Slavko Mentus ◽  
Diogo M. F. Santos ◽  
Raquel P. Rocha ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Double Layer ◽  
Molybdenum Carbide ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Carbon Xerogel ◽  
Electrocatalytic Properties ◽  
Molybdenum Carbides

Molybdenum carbide (Mo2C)-based electrocatalysts were prepared using two different carbon supports, commercial carbon nanotubes (CNTs) and synthesised carbon xerogel (CXG), to be studied from the point of view of both capacitive and electrocatalytic properties. Cation type (K+ or Na+) in the alkaline electrolyte solution did not affect the rate of formation of the electrical double layer at a low scan rate of 10 mV s−1. Conversely, the different mobility of these cations through the electrolyte was found to be crucial for the rate of double-layer formation at higher scan rates. Molybdenum carbide supported on carbon xerogel (Mo2C/CXG) showed ca. 3 times higher double-layer capacity amounting to 75 mF cm−2 compared to molybdenum carbide supported on carbon nanotubes (Mo2C/CNT) with a value of 23 mF cm−2 due to having more than double the surface area size. The electrocatalytic properties of carbon-supported molybdenum carbides for the oxygen reduction reaction in alkaline media were evaluated using linear scan voltammetry with a rotating disk electrode. The studied materials demonstrated good electrocatalytic performance with Mo2C/CXG delivering higher current densities at more positive onset and half-wave potential. The number of electrons exchanged during oxygen reduction reaction (ORR) was calculated to be 3, suggesting a combination of four- and two-electron mechanism.

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