The oxidation of iron at controlled oxygen partial pressures—I. Hydrogen/water vapour

1973 ◽  
Vol 13 (2) ◽  
pp. 113-124 ◽  
Author(s):  
P.L. Surman
Keyword(s):  
Water Vapour ◽  
Hydrogen Water ◽  
Partial Pressures

Synthesis and study of diaboleïte

1968 ◽  
Vol 36 (283) ◽  
pp. 933-939 ◽  
Author(s):  
R. E. Winchell ◽  
H. E. Wenden
Keyword(s):  
Water Vapour ◽  
Atmospheric Pressure ◽  
Stable Phase ◽  
Line Position ◽  
Natural Mineral ◽  
X Ray ◽  
Partial Pressures ◽  
Cell Dimensions ◽  
Natural And Synthetic

SummaryDiaboleïte has been synthesized between 25 and 100° C at atmospheric pressure and approximate water vapour partial pressures of 14·7 lb/in2. Under similar conditions at 170° C cumengéite appears to be the stable phase produced from a diaboleïte composition. Synthetic diaboleïte is much simpler morphologically than the natural mineral but the hemimorphic symmetry is more clearly demonstrated morphologically in the artificial specimens. A comparison of X-ray powder data for natural and synthetic diaboleïte shows almost exact detailed correspondence in line position and intensity between 0 and 180° 2θ. The cell dimensions obtained from X-ray powder data are a 5·869 ± 0·002 Å and c 5·495 ± 0·003 Å.

scholarly journals Exchange of Deuterium and Heavy Oxygen Among Hydrogen, Water Vapour and Oxide Catalysts of Spinel Type

1959 ◽  
Vol 80 (7) ◽  
pp. 693-697
Author(s):  
Yukio YONEDA ◽  
Akio FUJIMOTO ◽  
Shoji MAKISHIMA
Keyword(s):  
Water Vapour ◽  
Oxide Catalysts ◽  
Spinel Type ◽  
Hydrogen Water

Kinetics of the Reaction of Solid Anhydrous Potassium Carbonate with Gaseous Sulfur Dioxide

1994 ◽  
Vol 59 (11) ◽  
pp. 2357-2374 ◽  
Author(s):  
Erich Lippert ◽  
Karel Mocek ◽  
Emerich Erdös
Keyword(s):  
Sulfur Dioxide ◽  
Water Vapour ◽  
Potassium Carbonate ◽  
Anhydrous Potassium Carbonate ◽  
Heterogeneous Reaction ◽  
Fixed Bed ◽  
Partial Pressures ◽  
Flow Apparatus ◽  
Gaseous Sulfur ◽  
Kinetics Of

Results are presented of an experimental kinetic study of the heterogeneous reaction between gaseous sulfur dioxide and solid anhydrous potassium carbonate. The measurements were carried out in an all glass kinetic flow apparatus with nitrogen as the carrier gas and a fixed bed of the solid working in the differential regime at atmospheric pressure and a temperature of 423 K (150 °C). The reaction course was studied in dependence on the partial pressures of sulfur dioxide (pSO2) and water vapour (pH2O) in concentration ranges pSO2 = 13 - 430 Pa and pH2O = 0 - 2 100 Pa. In the reaction, water vapour acts as a gaseous catalyst. Based on the experimental data, the corresponding kinetic equation was found together with the numerical values of the relevant rate and equilibrium adsorption constants.

Effects of Water Vapour on the Oxidation of Chromia Formers

2008 ◽  
Vol 595-598 ◽  
pp. 1189-1197 ◽  
Author(s):  
David J. Young
Keyword(s):  
Grain Boundary ◽  
Water Vapour ◽  
Grain Structure ◽  
Partial Pressures ◽  
Cr2o3 Scales ◽  
Hydrogen Doping ◽  
Chromia Scales

Water vapour interacts with growing chromia scales in several different ways. Formation and volatilisation of Cr2O2(OH)2 is shown to account quantitatively for chromium loss from thin alloy foils reacted with air-steam mixtures over periods of 103 h. In the shorter term, water vapour is shown to refine the grain structure of Cr2O3 scales grown on Ni-25Cr. Scaling kinetics are at the same time accelerated by an additional, larger contribution to diffusion by a grain boundary species, either OH- or H2O. A slight increase in scaling rate observed at low water vapour partial pressures in H2/H2O gases is thought to be due to hydrogen doping.

Upward movement of granitic magma

1970 ◽  
Vol 107 (4) ◽  
pp. 335-340 ◽  
Author(s):  
J. R. Cann
Keyword(s):  
Water Vapour ◽  
Melting Curve ◽  
Granitic Magma ◽  
Upward Movement ◽  
Granite Magma ◽  
Partial Pressures ◽  
Orogenic Belts

SummaryThe negative P-T slope of the wet melting curve of granite sets limits on the degree of upward movement of granitic magma formed at particular partial pressures of water vapour. Wet granite magma cannot rise very far from its place of formation, and only dry granite magma can be erupted as a liquid. This observation leads to a better understanding of the granitic structure of orogenic belts, and explains some of the apparently paradoxical aspects of granites. Other wet magmas would also not be expected to be erupted as liquids.

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