Kinetics of the Heterogeneous Reaction of HNO3with NaCl:  Effect of Water Vapor

1998 ◽  
Vol 102 (39) ◽  
pp. 7631-7642 ◽  
Author(s):  
Julia A. Davies ◽  
R. Anthony Cox
Keyword(s):  
Water Vapor ◽  
Heterogeneous Reaction ◽  
Effect Of Water ◽  
Kinetics Of

scholarly journals Comparative study of the effect of water on the heterogeneous reactions of carbonyl sulfide on the surface of α-Al<sub>2</sub>O<sub>3</sub> and MgO

2009 ◽  
Vol 9 (3) ◽  
pp. 12483-12517
Author(s):  
Y. Liu ◽  
Q. Ma ◽  
H. He
Keyword(s):  
Water Vapor ◽  
Vapor Pressure ◽  
Heterogeneous Reaction ◽  
Water Vapor Pressure ◽  
Carbonyl Sulfide ◽  
Heterogeneous Reactions ◽  
Uptake Coefficient ◽  
Effect Of Water ◽  
Mineral Dusts ◽  
Α Al2o3

Abstract. The heterogeneous reaction on mineral dust was considered as a new sink of OCS in the troposphere. Here we compared the heterogeneous reactions of carbonyl sulfide (OCS) on the surface of α-Al2O3 and MgO and the effect of water on the reactions at 300 K using Knudsen cell – mass spectrometry, diffuse reflectance infrared Fourier transform spectroscopy, and temperature programmed reactions. H2S and CO2 were found to be hydrolysis products of OCS on both α-Al2O3 and MgO at ambient temperature. At low water vapor pressure, when water vapor pressure in the Knudsen cell reactor increased from 2.3×10−6 to 6.8×10−6 Torr, the initial true uptake coefficient of OCS on α-Al2O3 decreased from 4.70×10−7 to 3.59×10−7; while it increased from 5.19×10−7 to 6.48×10−7 on MgO under the same conditions. At high relative humidity, the observed uptake coefficients of OCS on α-Al2O3 and MgO decreased from 4.63×10−6 to 1.00×10−6 and from 9.72×10−5 to 7.68×10−5, respectively, when RH increased from 0.07 to 0.67 which corresponding to 1.7–15.9 Torr of water vapor pressure. In the RH region of 0.17–0.67, the average observed uptake coefficient of OCS on α-Al2O3 and MgO was equal to 8.34±2.19×10−7 and 8.19±0.48×10−5, respectively. The restrictive effect of water on the heterogeneous reaction of OCS on the surface of α-Al2O3 and MgO was found to be related to competitive adsorption between water and OCS molecules; while the promotive effect of water on the heterogeneous reaction of OCS on the surface of MgO at low coverage was ascribed to the formation of surface hydroxyl groups. When the environmental RH was greater than the RH of the monolayer, which occurred readily at the typical relative humidity of the troposphere, liquid membrane formed on the mineral dusts, especially, the basic liquid membrane formed on the basic component of mineral dusts may be the primary contributor to the heterogeneous hydrolysis of OCS in the troposphere.

Effect of Water Vapor on the Kinetics of Combustion of Hydrogen and Natural Gas: Experimental and Detailed Modeling Study

2008 ◽  
Author(s):  
Tanh Le Cong ◽  
Philippe Dagaut
Keyword(s):  
Water Vapor ◽  
Natural Gas ◽  
Gas Turbines ◽  
Kinetic Scheme ◽  
Fused Silica ◽  
Pollutant Emissions ◽  
Kinetic Reaction ◽  
Effect Of Water ◽  
Oxidation Of Hydrogen ◽  
Kinetics Of

The dilution of fuels by exhausts gases (mainly CO, CO2 and H2O) affects the kinetics of combustion. This dilution is used in gas turbines and flameless combustor. It helps reducing pollutant emissions, particularly NOx. Therefore, it is useful to study the effect of such compounds on the kinetics of oxidation of fuels such as natural gas and hydrogen. The oxidation of hydrogen and that of methane were studied experimentally in a fused silica jet-stirred reactor (JSR) over the temperature range 800–1500 K, from fuel-lean to fuel-rich conditions. The experiments were repeated in presence of 10% in mole of water vapor. A detailed chemical kinetic modeling of the present experiments and of literature data (flame speed, ignition delays) was performed using a previously proposed kinetic reaction mechanism, showing good agreement between the data and this modeling. Sensitivity and reaction paths analyses were used to delineate the important reactions influencing the kinetic of oxidation of the fuels in presence of water vapor. The kinetic reaction scheme proposed helps understanding the inhibiting effect of water vapor on the oxidation of hydrogen and methane. The effect of water vapor on NOx formation under gas turbine conditions was also investigated numerically using the proposed kinetic scheme.

The effect of water vapor on surface oxygen exchange kinetics of thin film (La,Sr)(Co,Fe)O3-δ

2020 ◽  
Vol 451 ◽  
pp. 227478
Author(s):  
Dongwei Xu ◽  
E. Mitchell Hopper ◽  
Kee-Chul Chang ◽  
Peter M. Baldo ◽  
Haesun Park ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Vapor ◽  
Oxygen Exchange ◽  
Surface Oxygen ◽  
Effect Of Water ◽  
Exchange Kinetics ◽  
Kinetics Of

scholarly journals Comparative study of the effect of water on the heterogeneous reactions of carbonyl sulfide on the surface of α-Al<sub>2</sub>O<sub>3</sub> and MgO

2009 ◽  
Vol 9 (16) ◽  
pp. 6273-6286 ◽  
Author(s):  
Y. Liu ◽  
Q. Ma ◽  
H. He
Keyword(s):  
Water Vapor ◽  
Vapor Pressure ◽  
Heterogeneous Reaction ◽  
Water Vapor Pressure ◽  
Carbonyl Sulfide ◽  
Water Layer ◽  
Heterogeneous Reactions ◽  
Effect Of Water ◽  
Mineral Dusts ◽  
Α Al2o3

Abstract. Here we compared the heterogeneous reactions of carbonyl sulfide (OCS) on the surface of α-Al2O3 and MgO and the effect of water on the reactions at 300 K using Knudsen cell–mass spectrometry, diffuse reflectance infrared Fourier transform spectroscopy, and temperature programmed reactions. H2S and CO2 were found to be hydrolysis products of OCS on both α–Al2O3 and MgO at ambient temperature. At low water vapor pressure (<6.8×10−6 Torr), when water vapor pressure in the Knudsen cell reactor increased from 2.3×10−6 to 6.8×10−6 Torr, the initial true uptake coefficient of OCS on α-Al2O3 decreased from 4.70±0.45×10−7 to 3.59±0.34×10−7; while it increased from 5.19±0.49×10−7 to 6.48±0.62×10−7 on MgO under the same conditions. At high relative humidity (0.07–0.67), the observed uptake coefficients of OCS on α-Al2O3 and MgO, which were measured using an in situ DRIFTS, decreased from 4.63±0.22×10−6 to 1.00±0.47×10−6 and from 9.72±0.46×10−5 to 7.68±0.36×10−5, respectively, when RH increased from 0.07 to 0.67 corresponding to 1.7–15.9 Torr of water vapor pressure. In the RH region of 0.17–0.67, the average observed uptake coefficient of OCS on α-Al2O3 and MgO was equal to 8.34±2.19×10−7 and 8.19±0.48×10−5, respectively. The restrictive effect of water on the heterogeneous reaction of OCS on the surface of α-Al2O3 and MgO was found to be related to competitive adsorption between water and OCS molecules; while the promotive effect of water on the heterogeneous reaction of OCS on the surface of MgO at low coverage was ascribed to the formation of surface hydroxyl groups. When the environmental RH was greater than the RH of the monolayer, which occurred readily at the atmospherically relevant humidity in the troposphere, thick water layer formed on the mineral dusts, especially, the basic thick water layer formed on the basic component of mineral dusts may be the primary contributor to the heterogeneous hydrolysis of OCS in the troposphere.

scholarly journals Revealing the effect of water vapor pressure on the kinetics of thermal decomposition of magnesium hydroxide

2020 ◽  
Vol 22 (24) ◽  
pp. 13637-13649 ◽  
Author(s):  
Satoki Kodani ◽  
Shun Iwasaki ◽  
Loïc Favergeon ◽  
Nobuyoshi Koga
Keyword(s):  
Thermal Decomposition ◽  
Water Vapor ◽  
Vapor Pressure ◽  
Magnesium Hydroxide ◽  
Water Vapor Pressure ◽  
Kinetics Of Thermal Decomposition ◽  
Effect Of Water ◽  
Kinetics Of ◽  
Kinetic Features

Kinetic features of the thermal decomposition of Mg(OH)2 are revealed under different heating and water vapor pressure conditions.

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
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