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.

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.

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 The rate constant of the reaction NCN + H2 and its role in NCN and NO modeling in low pressure CH4/O2/N2-flames

2015 ◽  
Vol 17 (24) ◽  
pp. 15876-15886 ◽  
Author(s):  
Nancy Faßheber ◽  
Nathalie Lamoureux ◽  
Gernot Friedrichs
Keyword(s):  
High Temperature ◽  
Rate Constant ◽  
Low Pressure ◽  
Temperature Rate ◽  
First Time

The high temperature rate constant of the so-far neglected reaction NCN + H2 has been measured for the first time and its influence on NOx flame modeling has been evaluated by implementation into the GDFkin3.0_NCN mechanism.

Formation Enthalpy, Free-Energy and Activity Coefficients of Sn-Pb Eutectic Solders

2009 ◽  
Vol 610-613 ◽  
pp. 531-536 ◽  
Author(s):  
Gui Sheng Gan ◽  
Fang Chen ◽  
Rong Chang Zeng ◽  
Yun Fei Du ◽  
Chang Hua Du
Keyword(s):  
Free Energy ◽  
High Temperature ◽  
Enthalpy Of Formation ◽  
Activity Coefficients ◽  
Excess Free Energy ◽  
Formation Enthalpy ◽  
Chemical Activity ◽  
Lead Pollution ◽  
The Relationship ◽  
The Enthalpy Of Formation

Based on Miedema’s model, the enthalpy of formation, excess free-energy and partial molar excess free-energy of Sn-Pb binary alloy solders were calculated. The model of the activity coefficient for each component in the solders was established. The diagrams of enthalpy of formation, free energy versus composition and activity versus composition and temperature as well as activity coefficients as a function of composition and/or temperature were drawn. And then the relationship between the activity coefficients of elements Sn/Pb in the solders and temperature was obtained. The approaches to reduction in the volatilization of lead at high temperature were proposed from the point of views that the lead pollution to environment results from its chemical activity in the solder alloys.

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