Shock tube studies of the N2O/Ar and N2O/H2/Ar systems

✍ Scribed by Anthony M. Dean

• Publisher: John Wiley and Sons
• Year: 1976
• Tongue: English
• Weight: 731 KB
• Volume: 8
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550080311

✦ Synopsis

N2O decay has been monitored via infrared emission for a series of mixtures containing N20/Ar and N20/H2/Ar. These mixtures were studied behind reflected shock waves in the temperature interval of 1950-3075' K with total concentrations ranging from 1.2 to 2.5 X 1OI8 molec/cm3. In all cases the N2O decayed exponentially, and a rate constant kobs was obtained. Runs without added Hz could be described by the following Arrhenius parameters: log A = -9.72 f 0.08 (in units of cm3/molec~sec) and EA =203.5 f 3.6 kJ/mole. Addition of 0.01% and 0.1% H2 was observed to increase the decay rate; the largest increase occurred between 2250 and 2500°K with 0.1% Hz, where kobs doubled.

Mixtures with no added H2 were analyzed by numerical integration of the following reactions:

(1)

(3) Quantitative agreement between calculations and observations were obtained with both high and low choices for k2 and k3.

The additional reactions

were included in the analysis of the mixtures containing Hz. only when low values were assigned to kz and k3. agreed with all the data were kl = 3.25 X lo-" exp(-105 kJ/RT).

Here agreement was obtained

The combinations of kl -+ k3 which exp(-215 kJ/RT) and k2 = ka = 1.91 x