The pyrolysis of monosilane

1966 ◽  
Vol 293 (1435) ◽  
pp. 543-561 ◽  
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Pressure Range ◽  
Initial Pressure ◽  
Product Formation ◽  
Reaction Vessel ◽  
Silicon Hydride ◽  
Temperature Range ◽  
Gaseous Products ◽  
Kinetic Features

A detailed analytical and kinetic study of the thermal decomposition of monosilane in the temperature range 375 to 430 °C and the initial pressure range 35 to 230 mmHg has been conducted. The gaseous products in the very early stages of the reaction are hydrogen, disilane and trisilane. In addition, later in the reaction a solid silicon hydride is formed, its composition varying as the reaction progresses. The kinetic features of product formation during the first 3 % of decomposition have been studied in detail, while those relating to higher extents of decomposition have been investigated less fully. The reaction is accelerated by the addition of certain foreign gases, but is unaffected by packing of the reaction vessel. A tentative mechanism involving the species silene, SiH 2 , is proposed.

The thermal decomposition of benzoic acid

1970 ◽  
Vol 48 (24) ◽  
pp. 3797-3801 ◽  
Author(s):  
Keith Winter ◽  
Donald Barton
Keyword(s):  
Thermal Decomposition ◽  
Benzoic Acid ◽  
Pressure Range ◽  
Initial Rate ◽  
Material Balance ◽  
Reaction Vessel ◽  
Radical Processes

The thermal decomposition of benzoic acid has been studied in a Pyrex reaction vessel at 475, 486, and 499 °C over the pressure range 5 to 40 Torr. The main products, CO2 and C6H6, were accompanied by smaller quantities of CO, H2, and biphenyl. The percentage of conversion varied from less than 1% for initial rate experiments to over 90 % in attempts to obtain a material balance. Moderately reproducible initial rates of formation of CO2 were obtained after the vessel had been conditioned by pyrolysis of benzoic acid. The order for the initial rate of formation of CO2, 1.20 ± 0.03 at 475 °C and 1.28 ± 0.04 at 499 °C, is discussed in terms of a combination of first and three-halves order reactions. Formation of both C6H5D and C6H6 in the presence of C6D5CD3 is accepted tentatively as evidence of formation of benzene by both molecular and radical processes.

Kinetic Study of the Pyrolysis of Formaldehyde

1972 ◽  
Vol 50 (7) ◽  
pp. 992-998 ◽  
Author(s):  
C. J. Chen ◽  
D. J. McKenney
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Kinetic Study ◽  
Pressure Range ◽  
Heterogeneous Reaction ◽  
Experimental Results ◽  
Arrhenius Parameters ◽  
Rate Laws ◽  
Kinetics Of

Kinetics of the thermal decomposition of pure formaldehyde were studied over a temperature range of 466–516 °C and a pressure range of ~ 50–160 Torr. Arrhenius parameters and rate laws were determined for carbon monoxide, hydrogen and methanol as follows:[Formula: see text]A mechanism is postulated which is qualitatively consistent with the experimental results but the activation energy for reaction 1[Formula: see text]is ~15 kcal/mol lower than predicted from recent thermochemical data, suggesting the possibility of a heterogeneous reaction.

KINETIC STUDY OF THE ISOMERIZATION OF n-BUTENES ON CHROMIA–ALUMINA

1962 ◽  
Vol 40 (11) ◽  
pp. 2130-2139 ◽  
Author(s):  
Y. Amenomiya ◽  
R. J. Cvetanović
Keyword(s):  
Kinetic Study ◽  
Rate Equation ◽  
Pressure Range ◽  
Experimental Results ◽  
Alumina Catalyst ◽  
Adsorbed Species ◽  
Temperature Range ◽  
Rate Determining Step

Mutual interconversions of the three n-butenes on a chromia–alumina catalyst have been studied in a temperature range between 210 and 260 °C and in a pressure range from about 10 to about 100 mm. Dependence of initial rates on the initial pressures of the reactants was determined experimentally. The initial rates of isomerization could be, in each case, expressed empirically by a rate equation conforming to the Langmuir–Hinshelwood formula. It was possible to explain the experimental results by assuming the existence of three different adsorbed species for the three n-butene isomers and their surface interconversions as the rate-determining step.

A Kinetic Study of the Reaction between the 2-Ċ3H7 Radical and i-C4H8: Enthalpy of Formation of the (CH3)2CHCH2Ċ(CH3)2 Radical

2004 ◽  
Vol 218 (4) ◽  
pp. 469-478
Author(s):  
László Seres ◽  
Martin Dinse ◽  
Miklós Görgényi
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Enthalpy Of Formation ◽  
Rate Constant ◽  
Addition Reaction ◽  
Product Analysis ◽  
Temperature Range ◽  
Reversible Addition ◽  
First Time ◽  
The Enthalpy Of Formation

AbstractThe reversible addition reaction2-Ċ3H7 + i-C4H8 ⇔ (CH3)2CHCH2Ċ(CH3)2was studied in the temperature range 491–543K by product analysis in experiments in which 2-Ċ3H7 radicals were generated by the thermal decomposition of azoisopropane. The enthalpy of formation of the radical (CH3)2CHCH2Ċ(CH3)2 was determined, the value obtained being ΔfH° = -21.8 ± 5.2kJ mol-1. From this result, the following group value was deduced: ΔfH°[Ċ–(C)3] = 177.1kJ mol-1. From the latter, ΔfH°(t-Ċ4H9) = 51.6kJ mol-1 was estimated. The rate constant of self-combination of the radical (CH3)2CHCH2Ċ(CH3)2 was determined for the first time: log(k12/(dm3mol-1s-1)) = 7.3.

Kinetic study of the second stage of the dolomite thermal decomposition

2008 ◽  
Vol 33 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Haykel Galai ◽  
Michèle Pijolat ◽  
Françoise Valdivieso ◽  
Kais Nahdi ◽  
Malika Trabelsi-Ayadi
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Second Stage

Dynamic Viscosity of Compressed Water to 10 Kilobar and Steam to 1500°C

1969 ◽  
Vol 11 (2) ◽  
pp. 189-205 ◽  
Author(s):  
E. A. Bruges ◽  
M. R. Gibson
Keyword(s):  
Gaseous Phase ◽  
Dynamic Viscosity ◽  
Low Temperatures ◽  
Pressure Range ◽  
Low Pressure ◽  
Temperature Range ◽  
Inversion Temperature ◽  
Pressure Steam ◽  
Correlating Equations ◽  
First Time

Equations specifying the dynamic viscosity of compressed water and steam are presented. In the temperature range 0-100cC the location of the inversion locus (mu) is defined for the first time with some precision. The low pressure steam results are re-correlated and a higher inversion temperature is indicated than that previously accepted. From 100 to 600°C values of viscosity are derived up to 3·5 kilobar and between 600 and 1500°C up to 1 kilobar. All the original observations in the gaseous phase have been corrected to a consistent set of densities and deviation plots for all the new correlations are given. Although the equations give values within the tolerances of the International Skeleton Table it is clear that the range and tolerances of the latter could with some advantage be revised to give twice the existing temperature range and over 10 times the existing pressure range at low temperatures. A list of the observations used and their deviations from the correlating equations is available as a separate publication.

Consecutive reactions in the thermal decomposition of phenylalkyldiazirines

1977 ◽  
Vol 55 (20) ◽  
pp. 3596-3601 ◽  
Author(s):  
Michael T. H. Liu ◽  
Barry M. Jennings
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Parameters ◽  
Diazo Compounds ◽  
First Order ◽  
Temperature Range ◽  
Decomposition Reactions ◽  
Consecutive Reactions ◽  
Rate Processes ◽  
Subsequent Decomposition

The thermal decomposition of phenyl-n-butyldiazirine and of phenylmethyldiazirine in DMSO and in HOAc have been investigated over the temperature range 80–130 °C. The intermediate diazo compounds, 1-phenyl-1-diazopentane and 1-phenyldiazoethane respectively have been detected and isolated. The decomposition of phenyl-n-butyldiazirine and the subsequent decomposition of its product, 1-phenyl-1-diazopentane, are an illustration of consecutive reactions. The kinetic parameters for the isomerization and decomposition reactions have been determined. The isomerization of phenylmethyldiazirine to 1-phenyldiazoethane is first order and probably unimolecular but the kinetics for the subsequent reactions of 1-phenyldiazoethane are complicated by several competing rate processes.

scholarly journals Kinetic study on thermal decomposition of toluene in a micro fluidized bed reactor

2015 ◽  
Vol 106 ◽  
pp. 721-727 ◽  
Author(s):  
Chao Gai ◽  
Yuping Dong ◽  
Pengfei Fan ◽  
Zhaoling Zhang ◽  
Jingcui Liang ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor
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