The oxidation of neopentane

1969 ◽  
Vol 308 (1494) ◽  
pp. 305-325 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Gas Phase ◽  
Static System ◽  
Radical Chain ◽  
Phase Oxidation ◽  
Reaction Proceeds ◽  
Gas Phase Oxidation ◽  
Branched Chain ◽  
The One ◽  
Heterogeneous Chain

The gas phase oxidation of neopentane has been studied in a static system at 280 °C. It is shown that the main course of the reaction is best understood as a degenerately branched chain reaction propagated by the hydroxyl radical. Two simultaneous radical chain mechanisms arise from the decomposition of the transient unstable species neopentylperoxy to give on the one hand either isobutyraldehyde and carbon monoxide, or isobutene and acetone, and on the other hand isobutene and formaldehyde possibly via oxetane. Isobutene and isobutyraldehyde do not accumulate as end products of the reaction, but are further oxidized to acetone and carbon monoxide. Pivalaldehyde and isobutene are the first detectable intermediate products, and the former is primarily responsible for the degenerate branching mechanism. It is concluded that the accumulation of formaldehyde in the system can account for an apparent change from homogeneous to heterogeneous chain termination as the reaction proceeds.

scholarly journals Study on the Mechanism of Cold and Negative Temperature Coefficient in Natural Process of Gasoline Hydrocarbon

2018 ◽  
Vol 166 ◽  
pp. 02007
Author(s):  
Qu Yakun ◽  
Long Jun ◽  
Zhou Han
Keyword(s):  
Temperature Coefficient ◽  
Gas Phase ◽  
Negative Temperature Coefficient ◽  
Oxidation Process ◽  
Negative Temperature ◽  
Alkoxy Radical ◽  
Radical Chain ◽  
Phase Oxidation ◽  
Gas Phase Oxidation ◽  
Free Radical Chain Reaction

In this paper, the stoichiometric mechanism of gas phase oxidation process of gasoline hydrocarbons was studied through using theoretical stoichiometry. The reason of the phenomenon of cold flame and negative temperature coefficient in the reaction of hydrocarbon molecules before the flame was explained from the molecular level. During the gas phase oxidation process, the alkoxy radical RO· reacts with hydroxyl ·OH to form a relatively stable intermediate such as aldehyde (or ketone) and H2O molecules, and the free radical chain reaction process.The temperature of the reaction process is very low, while the release of a large number of heat, the formation of aldehydes (or ketones) from the excited state back to the ground state when the emission of about 400nm wavelength of light blue fluorescence.

Étude chimique et cinétique de l'oxydation homogène en phase gazeuse d'alcanes légers. I. Isobutane

1989 ◽  
Vol 67 (5) ◽  
pp. 759-772 ◽  
Author(s):  
Bernard Vogin ◽  
François Baronnet ◽  
Gérard Scacchi
Keyword(s):  
Gas Phase ◽  
Reaction Scheme ◽  
Static System ◽  
Thermochemical Kinetics ◽  
Primary Products ◽  
Phase Oxidation ◽  
Major Reaction ◽  
Gas Phase Oxidation ◽  
A Chain ◽  
Reaction Routes

A literature survey on the homogeneous gas-phase oxidation of light alkanes shows that despite a rather high number of papers there are still, even in the case of isobutane, an important number of unresolved questions, which makes the writing of a reaction scheme rather difficult. To obtain more reliable experimental data, we have studied the homogeneous gas-phase oxidation of isobutane in a conventional static system, at 310 and 340 °C and subatmospheric pressure. This investigation is chiefly aimed at identifying and measuring the major primary products of the reaction. A chain radical scheme based on the primary products and on estimation of the rate constants of the elementary steps by the methods of Thermochemical Kinetics is put forward to interpret our experimental results. Two major reaction routes appear, one corresponding to the formation of isobutene and the other to the formation of isobutene oxide. The conclusions of the present investigation and suggestions for further developments are also mentioned. Keywords: oxidation, chemical kinetics, reaction mechanism, isobutane.

Gas phase oxidation of furfural to maleic anhydride on V 2 O 5 /γ-Al 2 O 3 catalysts: Reaction conditions to slow down the deactivation

2017 ◽  
Vol 348 ◽  
pp. 265-275 ◽  
Author(s):  
N. Alonso-Fagúndez ◽  
M. Ojeda ◽  
R. Mariscal ◽  
J.L.G. Fierro ◽  
M. López Granados
Keyword(s):  
Maleic Anhydride ◽  
Gas Phase ◽  
Reaction Conditions ◽  
Phase Oxidation ◽  
Gas Phase Oxidation
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