S2 Formation during the Pyrolysis of H2S in Shock Waves

Abstract

Abstract The rate of S2 formation from shock-heated H2S was measured by means of the UV absorption technique in the temperature range of 2380–3000 K. At all the temperatures measured, the S2 absorption during the reaction could be represented by (S2)t=(S2)∞{1−exp(−kt)}, where: k=109.2exp(−72 kcal⁄RT)s−1. The mechanism of the S2 formation was proposed, and the value of the second-order rate constant, k1, for the primary reaction, H2S+M→SH+H+M, was estimated as follows: k 1=1013.1exp(−92 kcal⁄RT)1mol−1s−1. The effects of the addition of NO and O2 on the rate of S2 formation were also investigated. The results showed the validity of the proposed reaction mechanism.