Kinetics of Selective Oxidation of Chromium Steels in Oxygen-Containing Lead

2003 ◽  
Vol 39 (5) ◽  
pp. 605-614 ◽  
Author(s):  
Ya. S. Matychak ◽  
V. S. Pavlyna ◽  
V. M. Fedirko
Keyword(s):  
Selective Oxidation ◽  
Chromium Steels ◽  
Kinetics Of

Ge-rich Si1-XGeX Nanocrystal Formation by the Oxidation of As-Deposited Thin Amorphous Si0.7Ge0.3 Layer

2002 ◽  
Vol 727 ◽  
Author(s):  
Tae-Sik Yoon ◽  
Ki-Bum Kim
Keyword(s):  
Selective Oxidation ◽  
Oxidation Rate ◽  
Solid Phase ◽  
Amorphous Film ◽  
Alloy Film ◽  
Spatial Density ◽  
Solid Phase Crystallization ◽  
Higher Temperature ◽  
20 Nm ◽  
Kinetics Of

AbstractGe-rich Si1-XGeX nanocrystals are formed by the selective oxidation of Si during the dry oxidation of an amorphous Si0.7Ge0.3 layer. The oxidation kinetics of the alloy film shows the activation energies of linear and parabolic rate constants are about 1.35 and 1.02 eV, respectively, based on the model proposed by Deal and Grove. In addition, as a result of the selective oxidation of Si and Ge pile-up during the oxidation process, Ge-rich Si1-XGeX nanocrystals are formed with the size of 5.6 ± 1.7 nm and the spatial density of 3.6×1011/cm2 at 600°C. At higher temperature of 700 and 800°C, the size of nanocrystal is increased to about 20 nm. The nanocrystals formation by oxidation is thought to be due to higher oxidation rate at grain boundary than at bulk grain. Therefore, the dependence of size on temperature is explained with the grain size determined by solid phase crystallization of amorphous film, oxidation rate, and grain growth.

Oxidation Kinetics of 1,2-Propanediol in the Presence of Pd and Pt Catalysts

2020 ◽  
Vol 850 ◽  
pp. 48-53
Author(s):  
Svetlana Chornaja ◽  
Svetlana Zhizhkuna ◽  
Jevgenija Vladiko ◽  
Reinis Drunka ◽  
Aija Krūmiņa
Keyword(s):  
Lactic Acid ◽  
Molecular Oxygen ◽  
Selective Oxidation ◽  
Oxidation Kinetics ◽  
Main Product ◽  
Pt Catalysts ◽  
Acid Yield ◽  
Active Metal ◽  
Oxidation Parameters ◽  
Kinetics Of

1.25 – 5wt%Pt/Al2O3, 1.25 – 5wt%Pd/Al2O3, 1wt%Pd/TiO2, 1 – 5wt%Pd/TiO2-NF, 1.25wt%Pt+1.25wt%Pd/Al2O3, 5wt%Pt/SiO2, 5wt%Pt/C catalysts were synthesised and tested in the selective oxidation of 1,2-propanediol by molecular oxygen. It was found that all catalysts were active in alkaline water solutions; lactic acid was obtained as the main product of the reaction. The conversion of 1,2-propandiol and the yield of lactic acid depended on the content of active metal in the catalysts. The most active for the oxidation of 1,2-propandiol were palladium-containing catalysts supported on TiO2 nanofibers (Pd/TiO2-NF). The highest 1,2-propanediol conversion (100 %) and lactic acid yield (96 %) were obtained using the 5wt%Pd/TiO2-NF catalyst at the following oxidation parameters: c0(1,2-propanediol) = 0.3 mol/L, P(O2) = 1 atm, n (1,2-propanediol)/n (Pd) = 500 mol/mol, t = 60 °C, c0(NaOH) = 1.5 mol/L.

Kinetics of isobutane selective oxidation over Mo-V-P-As-Cs-Cu-O heteropoly acid catalyst

2001 ◽  
Vol 206 (2) ◽  
pp. 183-195 ◽  
Author(s):  
Götz-Peter Schindler ◽  
Toshiaki Ui ◽  
Koichi Nagai
Keyword(s):  
Selective Oxidation ◽  
Heteropoly Acid ◽  
Acid Catalyst ◽  
Kinetics Of

scholarly journals The kinetics of selective oxidation of propene on bismuth vanadium molybdenum oxide catalysts

2013 ◽  
Vol 308 ◽  
pp. 25-36 ◽  
Author(s):  
Zheng Zhai ◽  
Andrew “Bean” Getsoian ◽  
Alexis T. Bell
Keyword(s):  
Selective Oxidation ◽  
Molybdenum Oxide ◽  
Oxide Catalysts ◽  
Kinetics Of

Structures, Mechanisms, and Kinetics of Ammoxidation and Selective Oxidation of Propane Over the M2 Phase of MoVNbTeO Catalysts

2011 ◽  
Vol 54 (10-12) ◽  
pp. 659-668 ◽  
Author(s):  
William A. Goddard ◽  
Lianchi Liu ◽  
Jonathan E. Mueller ◽  
Sanja Pudar ◽  
Robert J. Nielsen
Keyword(s):  
Selective Oxidation ◽  
Kinetics Of

The Role of Fast Diffusion Paths in the Selective Oxidation of Chromium Steels

2001 ◽  
Vol 194-199 ◽  
pp. 1689-1694 ◽  
Author(s):  
Carmen Piehl ◽  
Zsolt Tôkei ◽  
Hans Jürgen Grabke
Keyword(s):  
Selective Oxidation ◽  
Fast Diffusion ◽  
Chromium Steels ◽  
Diffusion Paths
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