Effect of Water Vapor on the Combination and Disproportionation of Ethyl Radicals in the Gas Phase

2004 ◽  
Vol 108 (10) ◽  
pp. 1638-1639 ◽  
Author(s):  
Pui-Teng Howe ◽  
Askar Fahr ◽  
Allan H. Laufer
Keyword(s):  
Water Vapor ◽  
Gas Phase ◽  
Effect Of Water ◽  
Ethyl Radicals

Interaction of H2O, O2 and H2 with Proton Conducting Oxides Based on Lanthanum Scandates

2019 ◽  
pp. 88-100
Author(s):  
A. S. Farlenkov ◽  
N. A. Zhuravlev ◽  
Т. A. Denisova ◽  
М. V. Ananyev
Keyword(s):  
Water Vapor ◽  
Partial Pressure ◽  
Gas Phase ◽  
Molecular Hydrogen ◽  
Proton Magnetic Resonance ◽  
Partial Pressure Of Oxygen ◽  
Proton Conducting ◽  
Conducting Oxides ◽  
Temperature Range ◽  
Apparent Level

The research uses the method of high-temperature thermogravimetric analysis to study the processes of interaction of the gas phase in the temperature range 300–950 °C in the partial pressure ranges of oxygen 8.1–50.7 kPa, water 6.1–24.3 kPa and hydrogen 4.1 kPa with La1–xSrxScO3–α oxides (x = 0; 0.04; 0.09). In the case of an increase in the partial pressure of water vapor at a constant partial pressure of oxygen (or hydrogen) in the gas phase, the apparent level of saturation of protons is shown to increase. An increase in the apparent level of saturation of protons of the sample also occurs with an increase in the partial pressure of oxygen at a constant partial pressure of water vapor in the gas phase. The paper discusses the causes of the observed processes. The research uses the hydrogen isotope exchange method with the equilibration of the isotope composition of the gas phase to study the incorporation of hydrogen into the structure of proton-conducting oxides based on strontium-doped lanthanum scandates. The concentrations of protons and deuterons were determined in the temperature range of 300–800 °C and a hydrogen pressure of 0.2 kPa for La0.91Sr0.09ScO3–α oxide. The paper discusses the role of oxygen vacancies in the process of incorporation of protons and deuterons from the atmosphere of molecular hydrogen into the structure of the proton conducting oxides La1–xSrxScO3–α (x = 0; 0.04; 0.09). The proton magnetic resonance method was used to study the local structure in the temperature range 23–110 °C at a rotation speed of 10 kHz (MAS) for La0.96Sr0.04ScO3–α oxide after thermogravimetric measurements in an atmosphere containing water vapor, and after exposures in molecular hydrogen atmosphere. The existence of proton defects incorporated into the volume of the investigated proton oxide from both the atmosphere containing water and the atmosphere containing molecular hydrogen is unambiguously shown. The paper considers the effect of the contributions of the volume and surface of La0.96Sr0.04ScO3–α oxide on the shape of the proton magnetic resonance spectra.

The effect of water vapor in increasing growth stresses in the oxide scale on martensitic steam plant alloys

2005 ◽  
Vol 22 (1) ◽  
pp. 139-146 ◽  
Author(s):  
Alexander Donchev ◽  
Harald Fietzek ◽  
Vladislav Kolarik ◽  
Daniel Renusch ◽  
Michael Schütze
Keyword(s):  
Water Vapor ◽  
Oxide Scale ◽  
Growth Stresses ◽  
Effect Of Water ◽  
Steam Plant

scholarly journals Upcycling of Vine Shoots: Production of Fillers for PHBV-Based Biocomposite Applications

2020 ◽  
Author(s):  
Grégoire David ◽  
Laurent Heux ◽  
Stéphanie Pradeau ◽  
Nathalie Gontard ◽  
Hélène Angellier-Coussy
Keyword(s):  
Water Vapor ◽  
Gas Phase ◽  
Mechanical Performance ◽  
Low Cost ◽  
Water Vapor Permeability ◽  
Contact Angles ◽  
Vapor Permeability ◽  
Water Contact ◽  
Median Diameter ◽  
Cost Of Materials

Abstract This paper aims at investigating the potential of vine shoots (ViSh) upcycling as fillers in novel poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV) based biocomposites. ViSh particles of around 50 µm (apparent median diameter) were obtained combining dry grinding processes, and mixed with PHBV using melt extrusion. Thermal stability and elongation at break of biocomposites were reduced with increasing contents of ViSh particles (10, 20 and 30 wt%), while Young’s modulus and water vapor permeability were increased. It was shown that a surface gas-phase esterification allowed to significantly increase the hydrophobicity of ViSh particles (increase of water contact angles from 59° to 114°), leading to a reduction of 27% in the water vapor permeability of the biocomposite filled with 30 wt% of ViSh. The overall mechanical performance was not impacted by gas-phase esterification, demonstrating that the interfacial adhesion between the virgin ViSh particles and the PHBV matrix was already good and that such filler surface treatment was not required in that case. It was concluded that ViSh particles can be interestingly used as low cost fillers in PHBV-based biocomposites to decrease the overall cost of materials.

Effect of Water Vapor on Ignition Temperatures of Methane-Air Mixtures

1934 ◽  
Vol 26 (1) ◽  
pp. 71-72 ◽  
Author(s):  
G. W. Jones ◽  
Henry. Seaman
Keyword(s):  
Water Vapor ◽  
Effect Of Water

Effects of water vapor on activated carbon load equalization of gas phase toluene

2010 ◽  
Vol 44 (13) ◽  
pp. 3924-3934 ◽  
Author(s):  
Marilou M. Nabatilan ◽  
William M. Moe
Keyword(s):  
Activated Carbon ◽  
Water Vapor ◽  
Gas Phase ◽  
Carbon Load

Effect of water vapor on the pyrolysis of the Moroccan (Tarfaya) oil shale

1999 ◽  
Vol 48 (2) ◽  
pp. 65-76 ◽  
Author(s):  
K. El harfi ◽  
A. Mokhlisse ◽  
M.Ben Chanâa
Keyword(s):  
Water Vapor ◽  
Oil Shale ◽  
Effect Of Water

The catalytic effect of water, water dimers and water trimers on H2S +3O2formation by the HO2+ HS reaction under tropospheric conditions

2016 ◽  
Vol 18 (26) ◽  
pp. 17414-17427 ◽  
Author(s):  
Tianlei Zhang ◽  
Chen Yang ◽  
Xukai Feng ◽  
Jiaxin Kang ◽  
Liang Song ◽  
...  
Keyword(s):  
Water Vapor ◽  
Catalytic Effect ◽  
Vapor Molecule ◽  
Effect Of Water ◽  
Water Vapor Molecule ◽  
Water Dimers

Catalyst X (X = H2O, (H2O)2and (H2O)3) is incorporated into the channel of H2S +3O2formation and the catalytic effect of water, water dimers and water trimers is mainly taken from the contribution of a single water vapor molecule.

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