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.

scholarly journals Direct measurements of the total rate constant of the reaction NCN + H and implications for the product branching ratio and the enthalpy of formation of NCN

2014 ◽  
Vol 16 (23) ◽  
pp. 11647-11657 ◽  
Author(s):  
Nancy Faßheber ◽  
Johannes Dammeier ◽  
Gernot Friedrichs
Keyword(s):  
High Temperature ◽  
Enthalpy Of Formation ◽  
Rate Constant ◽  
Branching Ratio ◽  
Total Rate ◽  
Direct Measurements ◽  
Temperature Rate ◽  
First Time ◽  
Product Branching ◽  
The Enthalpy Of Formation

The high-temperature rate constant of the reaction NCN + H, a key reaction for modelling NOx formation in flames, has been directly measured for the first time.

THE THERMAL DECOMPOSITION OF PERACETIC ACID IN AROMATIC SOLVENTS

1963 ◽  
Vol 41 (7) ◽  
pp. 1826-1831 ◽  
Author(s):  
F. W. Evans ◽  
A. H. Sehon
Keyword(s):  
Thermal Decomposition ◽  
Rate Constant ◽  
Peracetic Acid ◽  
First Order ◽  
Aromatic Solvents ◽  
Temperature Range ◽  
Polymeric Compounds

The thermal decomposition of peracetic acid in toluene, benzene, and p-xylene was studied over the temperature range 75–95°C. The main products of decomposition were found to be CH4, CO2, CH3COOH; small amounts of methanol, phenols, and polymeric compounds were also detected.The rate of the overall decomposition was first order with respect to peracetic acid, and the results could be explained by postulating the participation of the two simultaneous reactions:[Formula: see text] [Formula: see text]The rate constant of reaction (1) was independent of the solvent, whereas k2 was dependent on the solvent. The ratio k2/k1 was about 10.

Rate constant for the reaction CH3CO•+ HBr and the enthalpy of formation of the CH3CO•radical

2005 ◽  
Vol 86 (2) ◽  
pp. 355-361 ◽  
Author(s):  
Gergely Kovács ◽  
Ákos Bencsura ◽  
Sándor Dóbé ◽  
Tibor Bérces ◽  
Ferenc Márta
Keyword(s):  
Enthalpy Of Formation ◽  
Rate Constant ◽  
The Enthalpy Of Formation

Enthalpies of formation of LaBO3perovskites (B = Al, Ga, Sc, and In)

2003 ◽  
Vol 18 (10) ◽  
pp. 2501-2508 ◽  
Author(s):  
Jihong Cheng ◽  
Alexandra Navrotsky
Keyword(s):  
High Temperature ◽  
Enthalpy Of Formation ◽  
Solution Calorimetry ◽  
Tolerance Factor ◽  
Enthalpies Of Formation ◽  
Oxide Melt ◽  
High Temperature Oxide ◽  
Temperature Oxide ◽  
First Time ◽  
The Enthalpy Of Formation

Enthalpies of formation from constituent oxides and elements at 298 K were determined by high-temperature oxide melt solution calorimetry for a group of technologically important perovskites LaBO3(B = La, Ga, Sc, and In). Enthalpies of formation from oxides of LaAlO3and LaGaO3are −69.61 ± 3.23 kJ/mol and −52.39 ± 1.99 kJ/mol, respectively. The data were consistent with literature values obtained using other methods. The enthalpies of formation of LaScO3and LaInO3from oxides were reported for the first time as −38.64 ± 2.30 kJ/mol and −23.99 ± 2.31 kJ/mol, respectively. As seen for other perovskites, as the tolerance factor deviates more from unity (in the order Al, Ga, Sc, In), the enthalpy of formation from oxides becomes less exothermic, indicating a less stable structure with respect to the constituent oxides.

Thermal Decomposition of HO2NO2(Peroxynitric Acid, PNA):  Rate Coefficient and Determination of the Enthalpy of Formation

2005 ◽  
Vol 109 (4) ◽  
pp. 586-596 ◽  
Author(s):  
Tomasz Gierczak ◽  
Elena Jiménez ◽  
Veronique Riffault ◽  
James B. Burkholder ◽  
A. R. Ravishankara
Keyword(s):  
Thermal Decomposition ◽  
Enthalpy Of Formation ◽  
Rate Coefficient ◽  
Peroxynitric Acid ◽  
The Enthalpy Of Formation

THE THERMAL DECOMPOSITION OF DIPHENYLACETIC ACID

1960 ◽  
Vol 38 (8) ◽  
pp. 1271-1276 ◽  
Author(s):  
Margaret H. Back ◽  
A. H. Sehon
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Rate Constant ◽  
Phenylacetic Acid ◽  
Decomposition Reaction ◽  
Temperature Range ◽  
Diphenylacetic Acid

The pyrolysis of diphenylacetic acid was investigated over the temperature range 515-636° C using the toluene-carrier technique. The main products of this system were similar to those formed in the thermal decomposition of phenylacetic acid. The rate constant for the reaction[Formula: see text]was calculated as k′ = 8 × 1012.exp(−52,000/RT) sec−1.The over-all decomposition reaction was found to be partly heterogeneous and, therefore, the activation energy for reaction [1] may be only tentatively identified with D[(C6H5CH)2—COOH].

Sign in / Sign up

Export Citation Format

Share Document