KINETICS OF THE CATALYTIC ISOMERIZATION—DEHYDROISOMERIZATION OF METHYLCYCLOPENTANE

1961 ◽  
Vol 65 (6) ◽  
pp. 978-981 ◽  
Author(s):  
J. H. Sinfelt ◽  
J. C. Rohrer
Keyword(s):  
Catalytic Isomerization ◽  
Kinetics Of

Kinetics of the catalytic isomerization and disproportionation of rosin over carbon-supported palladium

2009 ◽  
Vol 152 (1) ◽  
pp. 242-250 ◽  
Author(s):  
Linlin Wang ◽  
Xiaopeng Chen ◽  
Jiezhen Liang ◽  
Yueyuan Chen ◽  
Xiaodong Pu ◽  
...  
Keyword(s):  
Catalytic Isomerization ◽  
Supported Palladium ◽  
Kinetics Of

Studies on kinetics of catalytic isomerization of methyl linoleate

1985 ◽  
Vol 62 (4) ◽  
pp. 734-738 ◽  
Author(s):  
V. M. Deshpande ◽  
R. G. Gadkari ◽  
D. Mukesh ◽  
C. S. Narasimhan
Keyword(s):  
Methyl Linoleate ◽  
Catalytic Isomerization ◽  
Kinetics Of

scholarly journals The catalytic isomerization of buten-1

1941 ◽  
Vol 178 (972) ◽  
pp. 106-117 ◽  
Keyword(s):  
Double Bond ◽  
Hydrogen Pressure ◽  
Square Root ◽  
Double Bond Migration ◽  
Rate Determining Step ◽  
Catalytic Isomerization ◽  
Rate Of Reaction ◽  
Hydrogenation Reactions ◽  
Kinetics Of ◽  
Catalytic Exchange

It has been shown that butene-1 undergoes isomerization to butene-2 on a nickel catalyst in the presence of hydrogen. B y using deuterium, this double-bond migration has been examined simultaneously with the exchange and hydrogenation reactions. The kinetics of double-bond migration and hydrogenation at 65° C were found to be identical, the rate of reaction in both cases being proportional to the square root of the butene pressure and to the square root of the hydrogen pressure. Energies of activation for the three reactions were measured over the temperature range 76-126° C and the following values found: Exchange 9.0 kcal. Hydrogenation 2.5 ,, Double-bond migration 5.9 ,, At the lowest temperatures, the rate of double-bond migration was about six times that of exchange. These facts are in agreement with the theory that the catalytic exchange between olefines and deuterium takes place through the formation of an associative complex. The rate-determining step in the double-bond migration is the second, fast step of the exchange reaction, viz.

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

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