scholarly journals 1.1.4 SiC-based MIS gas sensor for CO detection in very high water vapor environments

2012 ◽  
Author(s):  
O. Casals ◽  
A. Romano-Rodriguez ◽  
Th. Becker
Keyword(s):  
Water Vapor ◽  
Gas Sensor ◽  
High Water ◽  
Co Detection ◽  
Very High

scholarly journals SiC-Based MIS Gas Sensor for High Water Vapor Environments

2011 ◽  
Vol 25 ◽  
pp. 1321-1324
Author(s):  
O. Casals ◽  
Th. Becker ◽  
P. Godignon ◽  
A. Romano-Rodriguez
Keyword(s):  
Water Vapor ◽  
Gas Sensor ◽  
High Water

scholarly journals SiC-based MIS gas sensor for high water vapor environments

2012 ◽  
Vol 175 ◽  
pp. 60-66 ◽  
Author(s):  
Olga Casals ◽  
Thomas Becker ◽  
Philippe Godignon ◽  
Albert Romano-Rodriguez
Keyword(s):  
Water Vapor ◽  
Gas Sensor ◽  
High Water

Use of Very High Water-Vapor Pressures to Evaluate Candidate Compositions for Environmental Barrier Coatings

2005 ◽  
Author(s):  
Peter F. Tortorelli ◽  
Karren L. More
Keyword(s):  
Water Vapor ◽  
High Water ◽  
Vapor Pressures ◽  
Experimental Proof ◽  
Barrier Coatings ◽  
Environmental Barrier Coatings ◽  
Environmental Barrier ◽  
Elevated Water ◽  
Barium Aluminosilicate ◽  
Very High

Environmental barrier coatings (EBCs) are used to protect Si-based ceramics from accelerated oxidation and volatilization in the presence of elevated water-vapor pressures at high temperatures and high gas velocities. Previously, an analysis based on mass flux of volatilized species has shown that operating at very high H2O pressures can be used to compensate for the low gas velocities found in many laboratory exposure facilities so as to conduct first-stage screening of EBC compositions for volatility resistance. To test this prediction experimentally, a high-temperature furnace was modified to accommodate gas pressures of up to 20 atm and bulk specimens of barium-strontium aluminosilicate (BSAS), barium aluminosilicate (BAS), and strontium aluminosilicate (SAS), silica (SiO2), and silicon carbide (SiC) were exposed at 1250°C in 90% H2O-10% air. This set of materials provided an adequate spread in susceptibility to volatilization to evaluate the proposed approach because BSAS, BAS, and SAS are significantly more volatilization resistant in water-bearing environments than SiO2 and Si-bearing ceramics (such as SiC) that form silica under these conditions. The gravimetric results provided clear trends in volatilization resistance. The three aluminosilicates exhibited similar kinetic behavior and had significantly lower rates of mass losses than the SiO2 and SiC. These findings provided the experimental proof-of-principle for using high-pressure, low-gas-velocity exposures for qualitative differentiation of degrees of volatilization resistance among different candidate materials being developed for EBC applications.

ChemInform Abstract: Selective CO Detection by Using Indium Oxide-Based Semiconductor Gas Sensor.

ChemInform ◽  
2010 ◽  
Vol 27 (26) ◽  
pp. no-no
Author(s):  
H. YAMAURA ◽  
J. TAMAKI ◽  
K. MORIYA ◽  
N. MIURA ◽  
N. YAMAZOE
Keyword(s):  
Gas Sensor ◽  
Indium Oxide ◽  
Semiconductor Gas Sensor ◽  
Co Detection

scholarly journals Torrefaction of Woody and Agricultural Biomass: Influence of the Presence of Water Vapor in the Gaseous Atmosphere

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 30
Author(s):  
María González Martínez ◽  
Estéban Hélias ◽  
Gilles Ratel ◽  
Sébastien Thiéry ◽  
Thierry Melkior
Keyword(s):  
Water Vapor ◽  
Water Content ◽  
Wheat Straw ◽  
Beech Wood ◽  
High Water ◽  
High Water Content ◽  
Biomass Degradation ◽  
Moist Atmosphere ◽  
Thermochemical Transformation ◽  
Degradation Reactions

Biomass preheating in torrefaction at an industrial scale is possible through a direct contact with the hot gases released. However, their high water-content implies introducing moisture (around 20% v/v) in the torrefaction atmosphere, which may impact biomass thermochemical transformation. In this work, this situation was investigated for wheat straw, beech wood and pine forest residue in torrefaction in two complementary experimental devices. Firstly, experiments in chemical regime carried out in a thermogravimetric analyzer (TGA) showed that biomass degradation started from lower temperatures and was faster under a moist atmosphere (20% v/v water content) for all biomass samples. This suggests that moisture might promote biomass components’ degradation reactions from lower temperatures than those observed under a dry atmosphere. Furthermore, biomass inorganic composition might play a role in the extent of biomass degradation in torrefaction in the presence of moisture. Secondly, torrefaction experiments on a lab-scale device made possible to assess the influence of temperature and residence time under dry and 100% moist atmosphere. In this case, the difference in solid mass loss between dry and moist torrefaction was only significant for wheat straw. Globally, an effect of water vapor on biomass transformation through torrefaction was observed (maximum 10%db), which appeared to be dependent on the biomass type and composition.

Fabrication of palladium functionalized sol-gel based SnO2 gas sensor for H2 and CO detection

2017 ◽  
Author(s):  
Meitham Amereh ◽  
Pouria Mehrabi ◽  
Reza Nadafi ◽  
Mina Hoorfar
Keyword(s):  
Gas Sensor ◽  
Sol Gel ◽  
Co Detection

Degradation of Solid Oxide Fuel Cell Cathodes Accelerated at a High Water Vapor Concentration

2010 ◽  
Vol 7 (2) ◽  
Author(s):  
S. H. Kim ◽  
K. B. Shim ◽  
C. S. Kim ◽  
J. T. Chou ◽  
T. Oshima ◽  
...  
Keyword(s):  
Water Vapor ◽  
Voltage Drop ◽  
Cell Voltage ◽  
High Water ◽  
Solid Oxide ◽  
Constant Current ◽  
Vapor Concentration ◽  
Water Vapor Concentration ◽  
Oxide Fuel ◽  
Constant Current Density

The influence of water vapor in air on power generation characteristic of solid oxide fuel cells was analyzed by measuring cell voltage at a constant current density, as a function of water vapor concentration at 800°C and 1000°C. Cell voltage change was negligible at 1000°C, while considerable voltage drop was observed at 800°C accelerated at high water vapor concentrations of 20 wt % and 40 wt %. It is considered that La2O3 formed on the (La0.8Sr0.2)0.98MnO3 surface, which is assumed to be the reason for a large voltage drop.

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