Studies on the oxidation mechanism of H2S based on direct examination of the key reactions

Kentaro Tsuchiya*, Kenshu Kamiya, Hiroyuki Matsui

*Corresponding author for this work

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

By conducting an excimer laser photolysis (193 and 248 nm) behind shock waves, three elementary reactions important in the oxidation of H2S have been examined, where, H, O, and S atoms have been monitored by the atomic resonance absorption spec-trometry, For HS + O2 → products (1), the rate constants evaluated by numerical simulations are summarized as: k1 = 3,1 × 10-11exp[- 75 kJ mol-1/RT] cm3molecule-1 (T = 1400-1850 K) with an uncertainty factor of about 2. Direct measurements of the rate con-stants for S + O2 → SO + O (2), and SO + O2 → SO2 + O (3) yield k2 = (2.5 ± 0,6) × 10-11 exp[-(15.3 ± 2.5) kJ mol-1/RT] cm3 molecule-1s-1 (T = 980-1610 K) and, k3 = (1.7 ± 0.9) × 10-12exp[-(34 ± 11) kJ mol-1 cm3molecule-1s-1s-1 (T = 1130-1640 K), respectively. By summarizing these data together with the recent experimental results on the H-S-O reaction systems, a new kinetic model for the H2S oxidation process is constructed, It is found that this simple reaction scheme is consistent with the experimental result on the in-duction time of SO2 formation obtained by Bradley and Dobson.

Original languageEnglish
Pages (from-to)57-66
Number of pages10
JournalInternational Journal of Chemical Kinetics
Volume29
Issue number1
DOIs
StatePublished - 1 Jan 1997

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