Low Temperature Transformation of the Surface of Copper Oxide Filled Ptfe Via Treatment in a Hydrogen Plasma

1988 ◽  
Vol 131 ◽  
Author(s):  
Dov B. Goldman
Keyword(s):  
Low Temperature ◽  
Copper Oxide ◽  
Hydrogen Plasma ◽  
Thermal Reduction ◽  
Surface Conductivity ◽  
Copper Oxides ◽  
Partial Pressures ◽  
Temperature Transformation ◽  
Plasma Reduction ◽  
Pressure Hydrogen

ABSTRACTThe surface conductivity of PTFE-copper oxide filled composites containing between 10 and 25% of the oxides increases significantly after treatment in a low pressure hydrogen plasma at temperatures below 100°C. The plasma-reduction of copper oxides (CuO and CuO/Cu2O mixture) was investigated and compared with thermal reduction at different hydrogen partial pressures.

scholarly journals Application of low-temperature low-pressure hydrogen plasma: treatment of artificially prepared corrosion layers

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Petra Fojtíková ◽  
Lucie Řádková ◽  
Drahomíra Janová ◽  
František Krčma
Keyword(s):  
Low Temperature ◽  
Chemical Reduction ◽  
Hydrogen Plasma ◽  
Optical Emission ◽  
Low Pressure ◽  
Oh Radicals ◽  
Plasma Chemical ◽  
Duty Cycles ◽  
Fundamental Research ◽  
Pressure Hydrogen

AbstractThe aim of this work is the application of low-temperature low-pressure hydrogen plasma on artificially prepared corrosion layers, so called plasma chemical reduction. It is necessary to use samples with artificially prepared corrosion layers because it is impossible to use the real artifacts for fundamental research. The bronze was chosen as a sample material. Formation of corrosion layers on the bronze samples was carried out in concentrated hydrochloric acid vapors with the addition of sand. The radio-frequency hydrogen plasma was generated in the flowing regime at a pressure of 160 Pa. Different values of supplied power were chosen as well as different discharge modes: continuous or pulsed mode with varied duty cycles. By the combination of supplied power and mode factors, we selected two values of effective power. The process of plasma chemical reduction was monitored by optical emission spectroscopy (OES) and simultaneously, the sample temperature was measured. Rotational temperatures were calculated from OH radicals spectra. Changes in the structure and elemental composition were determined using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX).

Reduction of Copper Oxide by Low-Temperature Hydrogen Plasma

2016 ◽  
Vol 36 (4) ◽  
pp. 1111-1124 ◽  
Author(s):  
K. C. Sabat ◽  
R. K. Paramguru ◽  
B. K. Mishra
Keyword(s):  
Low Temperature ◽  
Copper Oxide ◽  
Hydrogen Plasma

scholarly journals Low‐Temperature H 2 Reduction of Copper Oxide Subnanoparticles

2021 ◽  
Author(s):  
Kazutaka Sonobe ◽  
Makoto Tanabe ◽  
Takane Imaoka ◽  
Wang‐Jae Chun ◽  
Kimihisa Yamamoto
Keyword(s):  
Low Temperature ◽  
Copper Oxide

Sustainable steel through hydrogen plasma reduction of iron ore: process, kinetics, microstructure, chemistry

2021 ◽  
pp. 116971
Author(s):  
I.R.Souza Filho ◽  
Y. Ma ◽  
M. Kulse ◽  
D. Ponge ◽  
B. Gault ◽  
...  
Keyword(s):  
Iron Ore ◽  
Hydrogen Plasma ◽  
Process Kinetics ◽  
Reduction Of Iron ◽  
Plasma Reduction

scholarly journals Low-temperature combustion of methane over graphene templated Co3O4 defective-nanoplates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dian Gong ◽  
Gaofeng Zeng
Keyword(s):  
Low Temperature ◽  
Transition Metal Oxides ◽  
Active Oxygen Species ◽  
Low Cost ◽  
Thermal Reduction ◽  
Low Temperature Combustion ◽  
Solid Catalysts ◽  
Intermittent Feeding ◽  
Co Precipitation ◽  
Catalytic Combustion Of Methane

AbstractTransition metal oxides are the potential catalysts to replace noble-metal based catalyst for the catalytic combustion of methane due to the tolerable reactivity and low cost. However, these catalysts are challenged by the low temperature reactivity. Herein, the surface defective Co3O4 nanoplates are realized through a facile co-precipitation and thermal reduction method with the association of GO. The resultant catalysts (CoGO50) demonstrate a superior low-temperature reactivity for the methane oxidation to CO2 and H2O in comparison with the common Co3O4 catalyst. The reliable stability of CoGO50 catalyst was proved by 80 h testing with intermittent feeding of water vapor. The experimental analysis demonstrates that the presence of a small amount of GO significantly affects the catalysts in surface valence state, active oxygen species and surface oxygen vacancies through reacting with the cobalt oxide as a reductant. Moreover, GO plays as 2D confine template to form smaller and thinner nanoplates. This work provides a facile method to control the surface properties of catalyst not only for Co3O4 based catalysts but also for wider solid catalysts.

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