Kinetics into the steady state. I. study of the reaction of oxygen atoms with methyl radicals

1974 ◽  
Vol 6 (1) ◽  
pp. 111-123 ◽  
Author(s):  
Irene R. Slagle ◽  
Frank J. Pruss ◽  
David Gutman
Keyword(s):  
Steady State ◽  
Methyl Radicals ◽  
Oxygen Atoms

The Oxidation of Formyl Radicals

1974 ◽  
Vol 29 (2) ◽  
pp. 251-255 ◽  
Author(s):  
N. Washida ◽  
Richard I. Martinez ◽  
Kyle D. Bayes
Keyword(s):  
Steady State ◽  
Rate Constant ◽  
Reaction Times ◽  
Initial Growth ◽  
Methyl Radicals ◽  
Absolute Rate ◽  
Atmospheric Reactions ◽  
Low Concentrations ◽  
Absolute Rate Constant ◽  
State Concentration

Steady state concentrations of formyl radicals were measured with a photoionization mass spectrometer. The reaction of ethylene with oxygen atoms in a system free of O2 was used to form CHO and CH3. Preliminary experiments showed that the reaction of methyl radicals did not interfere with the CHO measurements. By using low concentrations of O and short reaction times, it was possible to observe the initial growth of the CHO concentration. From the rate of approach of CHO to its steady state concentration, the absolute rate constant for the reaction O + CHO was determined to be (2.1+0.4)×10-10 cm3 molecule-1 sec-1. Addition of molecular oxygen to this system caused a decrease in the steady state CHO concentration, due to the reaction, CHO+O2→HO2+C0 as was suggested by Groth and coworkers in 1938. The rate constant for this reaction was calculated to be (5.7±1.2)×10-12 cm3 molecule-1 sec-1. The importance of these rate constants for combustion and atmospheric reactions are discussed briefly.

Kinetics of the reaction between methyl radicals and oxygen atoms between 294 and 900 K

1987 ◽  
Vol 91 (16) ◽  
pp. 4375-4379 ◽  
Author(s):  
Irene R. Slagle ◽  
Dariusz. Sarzynski ◽  
David. Gutman
Keyword(s):  
Methyl Radicals ◽  
Kinetics Of ◽  
Oxygen Atoms

The thermal decomposition of methane. II. Secondary reactions, autocatalysis and carbon formation; non-Arrhenius behaviour in the reaction of CH3 with ethane

1976 ◽  
Vol 54 (20) ◽  
pp. 3175-3184 ◽  
Author(s):  
C.-J. Chen ◽  
M. H. Back ◽  
R. A. Back
Keyword(s):  
Thermal Decomposition ◽  
Steady State ◽  
Methyl Radicals ◽  
Carbon Formation ◽  
Radical Chain ◽  
Primary Products ◽  
Secondary Reactions ◽  
Decomposition Of Methane ◽  
State Concentration ◽  
Absorption Measurements

In the thermal decomposition of methane at temperatures from 880 to 1103 K, hydrogen and ethane are the only primary products. The rate of formation of ethane falls rapidly towards zero as the reaction progresses until ethane reaches a steady-state concentration. This behaviour is interpreted in terms of a radical chain mechanism,[Formula: see text]Values of k4 were obtained which confirm the non-Arrhenius behaviour of this reaction at these temperatures. Similar chain sequences propagated by addition or abstraction reactions of methyl radicals with ethylene, propylene, and acetylene can account for the formation and disappearance of these secondary products.At a later stage in the pyrolysis a marked autocatalysis is observed and the yield of ethane increases sharply above its steady-state value. It is concluded that this autocatalysis is largely a homogeneous process and is not caused by or associated with carbon formation. Deposition of carbon on the surface was observed at a still later stage of the decomposition, and was quantitatively estimated by light absorption measurements. Possible mechanisms for the auto catalysis are discussed.

A Measurement of the Yield of Carbon Monoxide from the Reaction of Methyl Radicals and Oxygen Atoms

2000 ◽  
Vol 104 (29) ◽  
pp. 6758-6763 ◽  
Author(s):  
Jack M. Preses ◽  
Christopher Fockenberg ◽  
George W. Flynn
Keyword(s):  
Carbon Monoxide ◽  
Methyl Radicals ◽  
Oxygen Atoms

Studies on Water in the Hydration Chamber of a Modified Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 544-545
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electron Microscope ◽  
Steady State ◽  
Room Temperature ◽  
Small Mass ◽  
Equilibrium Pressure ◽  
Biological Objects ◽  
Mechanical Pump ◽  
Differential Pumping

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

Continuous hydrogenolysis of acetal-stabilized lignin in flow

2021 ◽  
Author(s):  
Wu Lan ◽  
Yuan Peng Du ◽  
Songlan Sun ◽  
Jean Behaghel de Bueren ◽  
Florent Héroguel ◽  
...  
Keyword(s):  
Steady State ◽  
Challenges And Opportunities

We performed a steady state high-yielding depolymerization of soluble acetal-stabilized lignin in flow, which offered a window into challenges and opportunities that will be faced when continuously processing this feedstock.

Network reconstruction based on steady-state data

2008 ◽  
Vol 45 ◽  
pp. 161-176 ◽  
Author(s):  
Eduardo D. Sontag
Keyword(s):  
Steady State ◽  
Reverse Engineering ◽  
Theoretical Method ◽  
Network Reconstruction ◽  
Quasi Steady State ◽  
State Data

This paper discusses a theoretical method for the “reverse engineering” of networks based solely on steady-state (and quasi-steady-state) data.

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