Methanol Oxidaiton over the Nanoscale Supported Tungsten Oxide Catalysts

2011 ◽  
Vol 233-235 ◽  
pp. 1460-1463
Author(s):  
Yong Ming Dai ◽  
Tsung Chi Pan ◽  
Jih Mirn Jehng
Keyword(s):  
Tungsten Oxide ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Structural Information ◽  
Active Surface ◽  
Acid Sites ◽  
Oxide Catalysts ◽  
Methanol Oxidation Reaction ◽  
In Situ Raman Spectroscopy ◽  
Redox Sites

Nanoscale supported tungsten oxide catalysts were synthesized by hydrothermal method using γ-Al2O3, Nb2O5, TiO2, ZrO2and CeO2as supports with a loading of 5~20% WO3on each supports, respectively. The physical properties and structural information were characterized by BET, XRD, ICP-AES and in situ Raman spectroscopy. Raman results confirm that the desired molecular arrangements of the active surface WOxspecies have been achieved without the presence of the crystalline WO3phase. The reactivity/selectivity of the supported WOxcatalysts are chemically probed with steady-state methanol oxidation reaction. The catalytic results of methanol oxidation reaction have revealed that the acid sites are present on the surface of WOx/Al2O3, WOx/Nb2O5, WOx/TiO2and WOx/ZrO2catalysts for the mainly production of dimethylether (DME), and redox sites have only present on the surface of the WOx/CeO2catalysts for the oxidation production of formaldehyde (HCHO). In addition, the WOx/CeO2catalysts possesses the high redox reactivity and the WOx/Al2O3catalyst possesses the highest acid reactivity.

Tungsten Carbide Nanofiber Prepared by Electrospinning for Methanol Oxidation Reaction

2013 ◽  
Vol 596 ◽  
pp. 55-59
Author(s):  
Takayuki Ishikawa ◽  
Mohammad Ali Abdelkareem ◽  
Takuya Tsujiguchi ◽  
Nobuyoshi Nakagawa
Keyword(s):  
Tungsten Carbide ◽  
Tungsten Oxide ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Direct Methanol Fuel Cells ◽  
Electrospun Nanofibers ◽  
Methanol Oxidation Reaction ◽  
Anode Catalyst ◽  
Electrospinning Technique ◽  
Direct Methanol

Tungsten carbide nanofibers for the anode catalyst of direct methanol fuel cells (DMFCs) were prepared from the precursor nanofibers with the diameter around 250 nm using an electrospinning technique. The electrospun nanofibers from the mixture of ammonium metatungstate and polyvinylpyrrolidone were dried and calcined in air at 700 °C to form tungsten oxide nanofibers, and reduced in 20 vol.% CH4/H2 atmosphere at 700 °C for 2 h. Surface morphology and crystalline structure of the prepared nanofibers were investigated using FE-SEM and XRD. The methanol oxidation reaction (MOR) activity of the prepared samples was evaluated by cyclic voltammetry (CV). The FE-SEM and XRD analyses showed that beaded nanofibers of tungsten carbide were successfully obtained. The WC nanofiber electrocatalyst exhibited a MOR activity suggesting it can be a candidate of the catalyst for DMFC. The presence of impurities, carbon and tungsten oxide, which may affect the activity, were detected at the surface.

Pore structure dependent activity and durability of mesoporous rhodium nanoparticles towards the methanol oxidation reaction

2020 ◽  
Vol 56 (32) ◽  
pp. 4448-4451 ◽  
Author(s):  
Yan Guo ◽  
Shuai Chen ◽  
Yuan Li ◽  
Yunwei Wang ◽  
Houbing Zou ◽  
...  
Keyword(s):  
Porous Structure ◽  
Pore Structure ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Structure Effect ◽  
Methanol Oxidation Reaction ◽  
Rhodium Nanoparticles ◽  
Dependent Activity

A significant porous structure effect of mesoporous rhodium nanoparticles on the electrocatalytic methanol oxidation reaction was reported.

Catalytic performance of non-alloyed bimetallic PtAu electrocatalysts for methanol oxidation reaction

2017 ◽  
Vol 42 (51) ◽  
pp. 30109-30118 ◽  
Author(s):  
Yuan-Yuan Feng ◽  
Gui-Hua Song ◽  
Qiang Zhang ◽  
Hua-Shuai Hu ◽  
Mei-Ying Feng ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Catalytic Performance ◽  
Methanol Oxidation Reaction
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