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A shock tube study of the reaction S + H2 ⇌ SH + H in pyrolysis and photolysis systems

✍ Scribed by D. Woiki; P. Roth

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
417 KB
Volume
27
Category
Article
ISSN
0538-8066

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✦ Synopsis

Atomic resonance absorption spectroscopy (ARAS) was applied to measure S atoms, behind shock waves in COS/Hz pyrolysis or CSz/Hz photolysis systems. Both the pyrolysis of COS and the photolysis CSz was used to generate the S atoms, which subsequently reacts with H2 via the reaction:

The photolysis experiments were designed to provide clear first-order conditions for reaction (R3); i.e., the Hz concentration exceeds that of S by at least a factor of 100. The S atom profiles obtained during pyrolysis of highly diluted COS/HZ/Ar mixtures were analyzed by computer simulations based on a simplified reaction mechanism using the rate coefficient k3 as a fitting parameter. Both groups of experiments covered the temperature range of 1257 K 5 T 5 3137 K and lead to a rate coefficient of: k3 = 6.0 X 1014 exp(-12070 K / T ) cm3 mol-' s-l

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