Kinetics of the NCN + NO Reaction over a Broad Temperature and Pressure Range

2012 ◽  
Vol 116 (27) ◽  
pp. 7293-7301 ◽  
Author(s):  
Oliver Welz ◽  
Matthias Olzmann
Keyword(s):  
Pressure Range ◽  
Temperature And Pressure ◽  
Kinetics Of

scholarly journals Kinetics of the OH + NO<sub>2</sub> reaction: rate coefficients (217–333 K, 16–1200 mbar) and fall-off parameters for N<sub>2</sub> and O<sub>2</sub> bath gases

2019 ◽  
Vol 19 (16) ◽  
pp. 10643-10657 ◽  
Author(s):  
Damien Amedro ◽  
Arne J. C. Bunkan ◽  
Matias Berasategui ◽  
John N. Crowley
Keyword(s):  
Pressure Range ◽  
Great Influence ◽  
Rate Coefficients ◽  
Atmospheric Conditions ◽  
Collision Efficiency ◽  
Title Reaction ◽  
Temperature And Pressure ◽  
Kinetics Of ◽  
Lower Collision

Abstract. The radical terminating, termolecular reaction between OH and NO2 exerts great influence on the NOy∕NOx ratio and O3 formation in the atmosphere. Evaluation panels (IUPAC and NASA) recommend rate coefficients for this reaction that disagree by as much as a factor of 1.6 at low temperature and pressure. In this work, the title reaction was studied by pulsed laser photolysis and laser-induced fluorescence over the pressure range 16–1200 mbar and temperature range 217–333 K in N2 bath gas, with experiments at 295 K (67–333 mbar) for O2. In situ measurement of NO2 using two optical absorption set-ups enabled generation of highly precise, accurate rate coefficients in the fall-off pressure range, appropriate for atmospheric conditions. We found, in agreement with previous work, that O2 bath gas has a lower collision efficiency than N2 with a relative collision efficiency to N2 of 0.74. Using the Troe-type formulation for termolecular reactions we present a new set of parameters with k0(N2) = 2.6×10-30 cm6 molecule−2 s−1, k0(O2) = 2.0×10-30 cm6 molecule−2 s−1, m=3.6, k∞=6.3×10-11 cm3 molecule−1 s−1, and Fc=0.39 and compare our results to previous studies in N2 and O2 bath gases.

scholarly journals Kinetics of the OH + NO<sub>2</sub> reaction: Rate coefficients (217–333 K, 16–1200 mbar) and fall-off parameters for N<sub>2</sub> and O<sub>2</sub> bath-gases

2019 ◽  
Author(s):  
Damien Amedro ◽  
Arne J. C. Bunkan ◽  
Matias Berasategui ◽  
John N. Crowley
Keyword(s):  
Pressure Range ◽  
Great Influence ◽  
Rate Coefficients ◽  
Atmospheric Conditions ◽  
Collision Efficiency ◽  
Temperature And Pressure ◽  
Photolysis Laser ◽  
Kinetics Of ◽  
Lower Collision

Abstract. The radical terminating, termolecular reaction between OH and NO2 exerts great influence on the NOy / NOx ratio and O3 formation in the atmosphere. Evaluation panels (IUPAC and NASA) recommend rate coefficients for this reaction that disagree by as much as a factor 1.6 at low temperature and pressure. In this work, the title reaction was studied by pulsed laser photolysis-laser induced fluorescence over the pressure range 16–1200 mbar and temperature 217–333 K in N2 bath-gas, with experiments at 295 K (67–333 mbar) for O2. In-situ measurement of NO2 using two optical-absorption set-ups enabled generation of highly precise, accurate rate coefficients in the fall-off pressure range, appropriate for atmospheric conditions. We found, in agreement with previous work, that O2 bath-gas has a lower collision efficiency than N2 with a relative collision efficiency to N2 of 0.74. Using the widely used Troe-type formulation for termolecular reactions we present a new set of parameters with k0(N2) = 2.6 × 10−30 cm6 molecule−2 s−1, k0(O2) = 2.0 × 10−30 cm6 molecule−2 s−1, m = 3.6, k∞ = 6.3 × 10−11 cm3 molecule−1 s−1, Fc = 0.39 and compare our results to previous studies in N2 and O2 bath-gases.

Adsorption isotherms and kinetics of carbon dioxide on Chinese dry coal over a wide pressure range

Adsorption ◽  
2015 ◽  
Vol 21 (1-2) ◽  
pp. 53-65 ◽  
Author(s):  
Yongchen Song ◽  
Wanli Xing ◽  
Yi Zhang ◽  
Weiwei Jian ◽  
Zhaoyan Liu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Adsorption Isotherms ◽  
Pressure Range ◽  
Adsorption Isotherms And Kinetics ◽  
Wide Pressure Range ◽  
Kinetics Of ◽  
Wide Pressure

Competing Channels in the Propene + OH Reaction: Experiment and Validated Modeling over a Broad Temperature and Pressure Range

2011 ◽  
Vol 225 (11-12) ◽  
pp. 1271-1291 ◽  
Author(s):  
Claudia Kappler ◽  
Judit Zádor ◽  
Oliver Welz ◽  
Ravi X. Fernandez ◽  
Matthias Olzmann ◽  
...  
Keyword(s):  
Pressure Range ◽  
Temperature And Pressure

Kinetics of the pyrolysis of propylene. Part I

1970 ◽  
Vol 48 (2) ◽  
pp. 317-325 ◽  
Author(s):  
M. Simon ◽  
M. H. Back
Keyword(s):  
Molecular Weight ◽  
Chain Length ◽  
Sharp Increase ◽  
Pressure Range ◽  
Pressure Change ◽  
Short Chain ◽  
Short Chain Length ◽  
Radical Process ◽  
Initiation Step ◽  
Kinetics Of

The kinetics of the pyrolysis of propylene have been studied over the temperature range 743–873 °K and the pressure range 200–600 Torr. At the lower temperatures initial rates of formation of methane, propane, and C6 products were measured and shown to be formed by a radical process of very short chain length. The orders and activation energies of the rates were consistent with the occurrence of the bimolecular initiation step[Formula: see text]Measurement of the pressure change showed that products of molecular weight higher than C7 and not measured by the analysis were formed in the initial stages of the reaction at the lower temperatures. As these higher molecular weight compounds, which are more unstable than propylene, accumulated in the system their dissociation increased the concentration of radicals and caused a sharp increase in the rates of formation of the lower molecular weight stable products.

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